Chard and Perpetual spinach

Perpetual spinach, like chard, is extremely easy to grow.
It needs lots of light and likes really fertile soil - think chick menure, a thin layer of grass clippings or compost mulch.
It's also a good container plant.

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Can I grow this in a 1 or 1.5 gallon grow bag? How much dirt/height is recommended for the roots? Thank you in advance