Q. Why doesn’t my swiss chard grow large and green? Collard greens in my garden are huge. Perhaps I do not thin out the plants, and they are too crowded?
A. What color and what variety is your chard? Some varieties are different colors, such as the one that looks like beet tops. There might be a variety that is small also.
More likely the problem has to do with sunlight (lack of), plant spacing, feeding, watering, or weeding.
Are you taking care of all those things? Full sun, plants 6″+ apart, feeding small amounts of complete balanced natural mineral nutrients, daily watering, and eliminating competition from weeds will assure a great crop in any soil.