Possibly just planted too late, or, too early. All of those like cool weather and will tend to go bitter when it turns too hot. Michilli cabbage is a Chinese cabbage and when the head forms it will not be fuzzy. Mustard tends to be tangy. I think mostly meant to add a little to a salad. The chard may be better when the weather cools off. You could let it grow until then, chop the stems and leaves, stir fry the stems first then add the leaves. If you like vinegar, sprinkle on. I personally like to add bacon bits and a sprinkling of shredded Swiss cheese or parmesean.
I am happy if I can pull even just a couple of summer squash. Used to be my plants all died BEFORE i could harvest any so I am happy this year! Always challenges in the garden.
