How Does a Greenhouse Work?
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- เผยแพร่เมื่อ 15 ต.ค. 2024
- Greenhouses are great for many gardeners, but they are not a magical garden structure that makes growing plants easy. Understanding how a greenhouse works and its limitations can save gardener stress. Gardener Scott shows the daily changes in greenhouse temperatures and discusses how to use a greenhouse for best effect. (Video #330)
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Back in the 70s, I used to build solar homes and trapping heat was very important part of the process. We would build black concrete walls inside the home on the southern exposure to be heated through windows during the day and release heat at night. Very effective.
Really good explanation! I have a 15x20’ polycarbonate greenhouse in zone 7 Utah, and I start planting in February with a tiny space heater that’s thermostat controlled. By June I need to cover the greenhouse with shade cloth, keep the doors open, and keep a fan running during daytime hours. I take off the shade cloth in September and start closing the doors at night, then in October just leave them shut. Automatic windows regulate the temp ok. I put the little heater back in late October and am able to harvest tomatoes, peppers, and melons through December. The whole month of January I clean out all plants, remove the heater and throw the doors wide open to freeze out any pests and their eggs before planting again in February.
Carolyn. Great detail. I am in Mapleton in Utah. Made a custom greenhouse myself. Going to try your details here. What kind of heater do you use? Do you have to use any lights?
@@garrisonjones Hi Garrison, I use a tiny electric space heater about 7”x7”x9” set on low. I haven’t used any lights in the greenhouse, but if I wanted to use it in January I’d need lights. I actually start some seeds indoors under lights ( brassicas, celery, bulb onions, peppers) starting Jan 1st and repot and move the brassicas into the greenhouse late February (leave the rest under lights). That’s the same time I start tomatoes indoors to move out in April with all the other plants that have been growing indoors. I leave the heater low to the ground cuz heat rises. It’s so small it mostly just keeps the air above freezing.
@@garrisonjones Incidentally I’m in Pleasant Grove, Mapleton may be closer to 6b.
How well would that system work in zone 3 Montana?
@@tommcinerney1420 you might want to use a propane heater and keep a top window open/cracked. Or get a 32 gallon black trash can and a 150w aquarium heater
As someone who eventually wants to have a greenhouse, I found this very informative. Thank you.
Would it be less informative if you didn't want a greenhouse
You can get a 1000 CFM attic roof vent fan for 100 bucks. It has a thermostat and humidistat built in so you can set at what temp it comes on. That's what I use for my small greenhouse tho you do have to wire it and set up some intake holes. Also I use cheap aquarium heaters in a big plastic barrel to heat the greenhouse at night.
Brilliant explanation of how greenhouses work and why we need to manipulate the temps. Great video Scott
And , for me, reasons to use them mainly for " season extension " and learn to live and eat more seasonally and preserve foods in more ways, in particular, ways which preserve the benefits of freshness ( taste, nutrition, texture etc. ), such as basic fermenting and dehydrating.
Would you agree that during summertimes, the greenhouse temps are a must to regulate; otherwise, temps could get too high and harm or kill that growing? So... open crossflow venting, fans if necessary, for the afternoons; than, in the cool of the evening.. close those vents to assure growth and not freeze. Somethin like that? And that is probably 3/4 of the year here on the Oregon Coast... everyday. Takes commentment.
No kidding! I would have never thought it would actually get too hot in a greenhouse in the winter months.
@@timothybradek3560 You're lucky to live in the coast in Oregon. The temps stay pretty mild there year round compared to a desert climate like I live in. At least, that's what I thought when I lived in the Rockaway beach area many years ago. Plus you have the added benefit of humidity, so you probably wouldn't need to water as much (feel free to correct me if I'm wrong).
At any rate, I can sort of answer your questions based on my limited experience attempting to use a greenhouse. I naively thought you could just get a GH, put the maturing seedlings in it, and "poof" they'd start growing faster and wouldn't need watering as much because of condensation. I found out the hard way that it gets too hot in a GH in the summer to safely use a greenhouse in my area. Our summers are dry and range from 88 to over 100 degrees F from June to August. I also discovered condensation can create mold or mildew on leaves unless you vent the greenhouse each day. I lost a couple of vegetables that I'd started along with a couple of succulents I was trying to propagate because it had gotten too hot. I began opening up the greenhouse door in the mornings and closed it at night, which took care of further mildew/mold issues.
Monitoring the temperatures would have been a good idea and would have made it possible to use the greenhouse in the colder months, so I'd recommend your doing that. As for the summer, I wouldn't use a greenhouse during the day - even in Oregon. I think most plants survive in the cold until there's a danger of frost. I don't recall there being any frost when we were there. We left the end of October, so it had started getting colder.
Unless things have changed, during the summer months, the temps in Oregon were around 78 to 88 degrees during the day. It may get cold enough outdoors to warrant using a GH at night. I don't think you'd have to add heat or anything unless you were going to grow things through the winter...and I think that's only if temps drop below freezing. Do they on the coast?
Anyway, I'm personally not going to use my GH this year except for during Spring and Fall. I had hoped to keep my vegetables in the greenhouse in summer until they were big enough to not be completely destroyed by grasshoppers. I found out the GH offered little to no protection from the little beasts, which was disappointing. Anyway, I hope this information helps. 🙂
Thank you for putting the temperatures in Fahrenheit
That water idea is multiplied if you put them in black containers that get good sunlight throughout the day, it will heat the water hotter than the inside environment of your greenhouse thus giving you more thermal usage throughout the night. Kind of like how a solar shower works.
I have a cold frame. I added foam board insulation and along the interior backside, on which the sun shines, I made a a wall of bricks. With the bricks, the cold frame was consistently 20-40 degrees F hotter than ambient air . I live in Michigan, zone 5.
Thank you Gardener Scott, I live in NC, Zone 8A. Last summer I didn’t understand why my plants died in my small walk-in greenhouse and learned that keeping them closed in didn’t protect them from the heat, but just the opposite. Watching your video gave me a better perspective on how to maintain my plants throughout the year.
Sand will also reportedly release its heat to warm a room or area. This is really surprising. Thank you so much!
I never thought of that, thanks, so kind of like a storage heater. What other ways can you use the sun to store heat for the night?
@@magicalrobsterAny thermal mass that isn't too conductive. Water, sand, stone, etc. You want materials that can soak up tons of heat in the day and slowly release it at night. It acts to help cool a little in the day and warm a little at night.
While these items are storing the heat during the day, do they cause the greenhouse to be hotter as well or do they help it regulate the temperature? Tks
I think one method that you probably forgot is that you could create a compass thermal regulator that would produce heat from the compost that you could circulate through the greenhouse producing a more stable flow of heat even through the winter time.
Heat coils in soil or heat mats on a table are a good way to keep it warmer in winter. Water bottles or 55 gallon drums of water work wonders!
THANK YOU FOR THIS! You saved me from buying a greenhouse that would not have worked for me. Great information.
Same. I will be looking beyond amazons cheap ones for sure 😊
My friend sells produce at the winter farmers market and she uses Christmas lights in her hoop house. She is just north of Cortez and we are about 6200 ft. I love your little greenhouse.
I have a greenhouse in the U.K. - no idea what it’s for. (I’m new to gardening and it was here when we moved in) it’s too warm and dry for anything to thrive. I’ve done better growing outside. Hoping this helps me with the understanding of how they work !
I live in Rocky Mountain House Alberta Canada and we are zone 3b. Freaking cold in the winter lemme tell ya. I have a 25 foot hoop house and am building a bigger one this summer. I will also be investigating compost heat (Jean Pain) and hoping to have more fruits like watermelon and other tender fruits. Our season is so short and we get brutal hail at least once a month. No protection = no garden. Thank you for the info!!! Well presented and easy to understand.
It's a good thing I did not just dive in and go at it. Scott opened my eyes to some issues I did not even think about, thanks Scott 🖖.
I’m not sure how I found this video but I sure am glad I did. I’m in NB Canada so I will potentially be dealing with some severe weather. I feel like I have more of a clue for what I’m doing before taking that step and getting or building a greenhouse. Thank you so much. 😊
Excellent video...i bought a greenhouse..it was 39 degrees outside...in the greenhouse with no vents open..climbed to 96 degrees very quickly!
I put up a polycarbonate dome last September. I was able to go out there for sunshine all winter, which is incredible. I have a concrete paver floor. But i have no idea how to use it to grow because of the wide temperature swings over each day. Would love suggestions. Will plants freeze overnight? It gets pretty warm during the day but very cold at nighT. AND I had my inflatable hot tub going in the dome set at 104 all winter. It was still cold at night.
The air gaps also hurt heat retention for many people. I thought about giving some bubble wrap another life as insulation. One bad thing about thermal wax is it reacts to the inside temperature. On mine it takes its own sweet time closing the vents while alot of cold outside air gets in. This past year I had one of my vent assemblies get reversed from strong wind. I use the Univent variety on a 6x8 HF greenhouse. The springs got stretched and it opened so much that it looked like a knee bended backwards and couldn't close. Luckily no damage was done once I put the hinge angle on the correct side of the spring tension.
27 seconds in and I’m excited already… pretty cool to find exactly what I was looking for with ease .. ty
this was exactly the explanation i was looking for tonight when i wanted to learn about green houses! thanks for making this video!
I've had a plastic covered high tunnel greenhouse for 5 years now. Thank you for educating me further and giving me new goals to make it more efficient.
I'm so happy I discovered your channel. We just got our greenhouse this year and I've been pulling my hair out. This is so helpful. Thank you!!
I'm slowly assembling a 8'-6" x 12'-5" Halls Magnum greenhouse and really appreciate you sharing your knowledge and expertise. Looking forward to future videos and growing along with you in this new endeavor (for me) in the upcoming season. Thanks again.
Me too. Mine is a lean to. It is 8' X 5.5' and at the high point it is 7.5' tall at the low end it's 5'. Thanks for the education Gardener Scott.
Thanks for the temps in celsius, get's hard doing it in my head all the time. My old man is a fitter, so I have inches and feet, but Farenheight gets me all the time, such a strange system.
Great explanation and information. I live in far northern Vermont, zone 3, 3b and we can have bouts of cold for a few weeks that will not rise above -20 and could be as low as -45 for days.
Unless the greenhouse is heated, everything would still die using the 20 degrees above ambient rule.
Being the fourth least sunny State in the county, we don't always have the solar resources to bring the temperatures up even during the day.
A friend of mine built a beauty of a green house structure with an inground, 1000 gallon pool for Koi and goldfish that were part of a self contained hydroponic system.
Small pumps fed water up into the raised garden beds and the return drained back into the tank after passing through a gravel then sand filter. Fish waste was the primary nutrient for the plant base and the plants and filter kept the water clean.
A small ceramic heater maintained balanced heat day and night with, vents as you used, to allow escape of excess heat.
The water acted as a heat sink as well and maintained an average of 55 degrees Fahrenheit.
For keeping a better winter heat overnight thermal mass needs to be introduced to the system. Like water barrels or rocks. Possible have a partial dugout system or an air pipe system that stores or takes in heat/cool air from underground
I've done water and rocks and it's making a big difference. I show it in this video: th-cam.com/video/lU7cvF_mxyk/w-d-xo.html
Wow! Thank you so much for this video! After watching this I understand now that I really should not build one in my yard. I have about 20 plants that I need to overwinter and I'm just going to pull them into the house instead ☺️ a lot less work and more efficient for my small amount of plants! 🙏🏻🙏🏻🙏🏻
Needed this. A cold frame used as a greenhouse sounds like a great way to start seeds until i have greenhouse room.
I live in the desert zone 8a, built a south facing lean to greenhouse on the side of my garage. Rather than venting the hot air outside, I put a fan in the garage window at the top (which is part of the enclosed space of the greenhouse. The greenhouse heats the garage up to about 70f during the middle of the afternoon, and the garage retains enough heat to keep the greenhouse above freezing (when outside temps are in the mid to low 20's).
The garage would normally be around 50-55f without the greenhouse and it's so nice having it heated for free, other than the electricity to run the small fan.
I have a cheap, plastic wrapped, 6ftX8ft greenhouse.
I'm in zone 8a, in Southeast Alabama.
My greenhouse can barely keep plants alive during the winter. I just move my flower pots in when it starts getting cold, and put a small heater in when the 🌡 goes below 10°f.
It works for what I need, but I would love a larger one that could help me grow veggies during the winter
This was an amazing lesson, one I desperately needed. Thank you so very much! Zone 5b 🇨🇦 You've given me great strategies for using my little plastic green house better until I can afford a poly carb.
Great information!!!! Thanks for the video!
Great video
Thanks Scott
Possibly growing potatoes in black barrels would raise the temperature at night. The moist soil would absorb sunlight and radiate it throughout the whole length of the barrel at night. Haven't tried it yet but just an idea.
Great info. Not many videos addressing ambient indoor temps. Definitely will be helpful when deciding greenhouse design.
Very comprehensive and informative. Thank you.
I Saw A video of someone who painted 55 gallon barrels black and put them on the south side of the greenhouse it held the heat in all winter in a cold zone. I saw another where he dug 6 feet down and grew oranges in like zone 4 plus other things. Thank you for this video.
The water in the barrels makes a big difference.
I have been trying to learn horticulture and gardening for weeks now. This is the best channel so far. The best, easily.
Excellent Video .. thanks. This is the kind of information greenhouse manufacturers should provide to their customers so that they know what they're getting into. I live in Arizona (desert) and purchased a fair sized one (12x24) and found it to be unusable most of the year. Temps inside would hit 120+ in summer .. and as cold as the night in winter. No way to cool it down and limited ways to heat. Wound up being a storage building .. a real waste of money.
My 12 x 16 greenhouse maintains about 5 degrees above ambient overnight when fully loaded. The mass of the plants and soil and the biological decomposition going on makes quite a difference. I heat it with propane when the temperature drops below 45. Keeping it at 50F on nights when the temperature dips to freezing burns five gallons of propane every three days. It needs to be tightened up. It overheats within minutes when the sun hits it. My next improvement is a extraction fan on a thermostat. I'm getting tired of jumping up first thing in the morning to open a greenhouse. My greenhouse has glass walls, clear plastic roofing and a solid wall on the north side.
I want to build a big greenhouse off my kitchen that serves as 1) a place to grow herbs, veggies, fruits & tropical plants; 2) a covered "outdoor" dinning room (plants on the edges, table in middle); 3) a supplemental heat for our house/kitchen in the winter, along with air enriching oxygen from all the plants. But WOW, what a wide range of differences in temperatures! Now I know a few ways to keep the temperature more consistent and add grow lights in the winter.
Brits use this type a lot. They call it conservatory.
Great video and answered a lot of questions I had from from constructing a hoop house over one of my small 4 x 4 beds last fall. I learned from last year that we don't get enough hours of sunlight come November in zone 5B ny state in order for a greenhouse to work--cold temperatures aside. I'd have to have grow lights along with the heat for it to be useful where I live.
I’m in the same zone and a newbie. We seem to have cloudy gray skies all winter too. I’m not yet sure what’s possible.
I'm jealous of your warm weather
Nice the way you pass the know how…
I really never got involved in green house gardening..
Wife wants to move to the country so we have space…
And of course there will be a green house…
Lucky I don’t have much hair to pull out…
Good info
I use a small electric heater than maintain the inside temp @62-65. When the sun hits the GH & the temp rises above 65 the heater shuts off for the day. I watch the inside temp from
the house w a remote thermometer. When the temp hits 80F, I go out & open it up & get some fans going as necessary.
!
Very informative. Well worth watching
I just watched your passive heat video and watched this one. I am in Alaska Zone4a so i am here for the journey. Thanks for sharing your experience through your experiment. 👍🏾
This is exactly what I was wondering and haven't found such a great explanation until now. Thanks!
A wonderful video thank you. Inaccurate about why the greenhouse gets so cold at night. Just trying to be helpful. Heat transfers from molecules to So that outside air is transferring heat inside.. I am guessing it gets colder inside because it is transferring infrared but you need to ask a physicist
Thank you so much for this video. This was very informative and easy to watch.
Wonderful video! Thanks so much!
Thanks for the knowledge.
I'm about to make my first greenhouse and these are opsticals I didn't think of.
I'd love to see a 24 hour video of u doing all the things u mentioned to keep climate suitable for growing.
Thanks
That video is coming soon. Thanks.
Gardener Scott - Thanks! Because of you I purchased and built a Planta Sigma greenhouse last fall. I love that the greenhouse has doors at each end. My garden is at one end and my small orchard is at the other end. This March I had a electrician wire the greenhouse. That actually cost more than the price of the greenhouse, but it was well worth it. The electrical system is totally water proof. Wires are in conduit, 6 receptacles are incased as well as the overhead lights. I have an exhaust fan at one end and 2 intake shutters at the other end. During a few cold nights I had two small heaters to maintain temps in the 50’s. For control of hot and cold temps, electricity is a must. I just ordered a 40% shade cloth to go over the top of the greenhouse to help control the heat during the day. This way the fan wouldn’t be running constantly. I’ve found out, control of heat and cold is the key factor for greenhouse effectiveness. If plants get to cold or to hot, they will most likely not survive. The greenhouse is a powerful tool and I’m still learning how to use it. Great video! Gardener Chet
You are right that heat and cold control is key. Your efforts sound amazing.
Love this explanation! Best one i have heard. I love how in depth you get
Well explained and very informational. I rarely ever subscribe to channels but I have subscribed to your own as the data is priceless. Thank you!
Thanks! Welcome to the channel!
Very informative. I loved it. I've thinking of helping my Mom build a greenhouse but I wasn't sure how they work. Now I know. Thank you.
Simply, you're the best greenhouse house gardener. Thanks
Thanks grandpa for the information
Dear Gardener Scott,I hope this message finds you in good health and high spirits. I recently watched one of your videos on your channel about greenhouses, and I was truly impressed by the valuable work you are doing to benefit farmers and citizens alike through promoting healthy agriculture.Your insights into greenhouse technology are particularly fascinating, and I have a question that pertains to my specific circumstances. In my country, we experience a hot climate in the summer and a relatively cold climate during other seasons, characteristic of a Mediterranean climate. Additionally, we have regions that are 400 meters below sea level.Given these unique conditions, I am curious to know if greenhouses can be effectively utilized for commercial agriculture over large distances. Can they provide the necessary environmental balance to support extensive farming operations in such varied climates?Your expertise and advice would be greatly appreciated, as I am eager to explore sustainable agricultural solutions that can benefit our local farming communities.
Thank you for your time and for the incredible work you continue to share.
Warm regards,
Greenhouses have applications over many different climates but they may need supplemental equipment for climate and seasonal variations. Electrical or gas ventilation systems, heating equipment, or cooling machines may be necessary. Additionally, humidifiers or dehumidifiers may be needed based on climate. Lighting and irrigation systems are often required. I garden at high altitude and low humidity, with very hot summers and very cold winters without electricity and that influences when and how I can grow in my greenhouse. I choose to do it by myself with the known limitations. The cost and effort increases with more extensive operations, particularly if greenhouse management must overcome climatological limitations.
Well brother, your presentation should be Nobel Prize worthy! Outstanding & thanks!
Yes, Brilliant and extremely useful presentation. Really a methodical (academic) presentation with clear deductions !
Thank you so much
Great information, thank you!
Thank you for your clear explaination
An excellent video! Extra appreciation from using both temperature units.
Location microclimate helps ,I have a oak tree partially over my greenhouse ! Just as it gets into late spring leaves pop out providing some shade .as well as wind protection
Wow! You are a real teacher. Thank you. I love it when people like you sharing principles on how science works and I simply understood and apply. Thanks heaps. No amount of reading can equal to this video.
That was very valuable information
oh this was really interesting. It is so intriguing to see the differences in your greenhouse and mine. I record the temperatures and have a record from over the last year, but it was interesting to look at a single day :D I think this is soooo useful for people who are thinking about buying a greenhouse
Very timely info as we are building our greenhouse this month. Thank you!
Thanks for the info! I do not need, nor will I need a greenhouse in Los Angeles, but the information was great! Thanks for sharing.
Great video. There is however one small inaccuracy. It's not UV radiation responsible for heating effect but much more IR radiation.
I have found that in Michigan during winter a fully polycarbonate GH tempetures vary greatly depending on how far off the ground you measure your tempeture ....
A big thank you for putting the Celsius in it makes it so much easier
This greenhouse looks perfect for my needs. Do you have a detailed build video of this for no-experience guys like me? Many thanks.
I've been working on finishing a build video. I hope to have it out in the weeks ahead.
Gardener Scott, thank you so much for this information Sir! I absolutely love your videos and the rich content provided. This video helped answer so many questions I had regarding green houses.
Very interesting video! I love the automatic windows on ours. It‘s very small so it heats up quickly. Without those windows I would definitely boil or burn my plants during the summer…
Very good info and very well done. Thank you!
Awesome video with so much valuable information! I live in Georgia (zone 7b). I am not to the point of installing a greenhouse, but would like to get more information on the effectiveness of using a low tunnel to keep plants I have stepped up, such as peppers and tomatoes. Thank you.
Georgia zone 7b too.. did you ever install that greenhouse?
Good explanation buddy i m impressed
Thank you so much. Excellent!
I'm in the process of building a window greenhouse and this has been very helpful!
I am adding a greenhouse as well this year. I will be heating mine.
Beautiful explanation! And we very much appreciate the degrees translation to Celsius
I started 500 Tomato plants in a make shift greenhouse out of plastic and willow branches weaved through an old canopy frame
The greenhouse I went too had black barrels of water which absorbed and released heat and vents that used Bees Wax that would expand in the heat and open the vent and close the vent when it cooled off.
Great greenhouse overview thanks
Thank you! Very informative
Dry air cools quicker than damp air hence the dessert type conditions in the glass house cool ore than the outside temperature. Repeat your temps testing after watering and you will have a different result. Moist air won't cool as much and will still warmer overnight.
Night temperature depends how well sealed doors windows an how good your plastic or polycarbonate is . I use 2 layers plastic an construction zippers for doors an another layer over beds of plastic when it gets below zero ,30 below an spinach kale lettuce an other leafy greens survived ,no extra heat when it starts to warm an more light things explode with more light
Hey Jeremy, tuned in just shy of being late ...Green house is CRAZY !! Tell the wifey the community see the hard work she puts in and everything looks amazing 😊👍😊 & I am a cucumber lover🤓 thanks for all you do Jeremy I always feel smarter after every episode...
Contemplated on building a greenhouse. Limited space, more worthwhile to make a permanent bed instead.
I have a cold frame that works for now. wish I had more space, wish I was born rich, Oh well!
Good Info Scott
Wow that’s a lot to know! Great video. But I’m a bit more confused. I am looking for the best greenhouse for my needs. I’ll watch the other videos you have posted. Thank you for such a thorough explanation
Awesome explanation and 24 hour trial. Really appreciate it. Thank you.
Very informative :) thank you
I had no idea that it could get even colder inside the greenhouse than outside of it, overnight. I do keep several water jugs out there, mostly for occasional winter watering, but I knew they also hold heat. I had no idea that stone or brick could retain heat -- good to know for a path later.
@@CloudWatcher500 Very interesting! Thank you!
Spray paint your jugs black & sit them in sun then tuck around plants at night They work like hot water bottles & got me thru a recent unexpected freeze.
@@angeladoll9785 Thank you! I had just recently heard that suggestion in a different venue -- sounds like a very good idea! I'll try it!
Hi Gardener Scott…. Thank you for such a detailed video. In Winnemucca Nv high desert z5/6, and during early spring I need to go out of the greenhouse to cool off .. always a breeze or raging wind here. I do have to shade one side of the GH from intense afternoon sun plus I have fans & swamp cooler with a automatic temp control & still have to try to keep on top of things lol 😂.
Have a wonderful day 👵🏻👩🌾❣️
Can't wait to see the future installments. Nice video, thanks for posting.