I set up a couple container gardens this spring, both 3'x5', filled about 18" deep with a soil/compost mix from the garden center called "vegetable soil mix". I have a bunch of different vegetables planted from starts, as well as carrots, beets, and radishes planted from seeds.

I fertilize every 3 weeks with a liquid fertilizer and water every 2-3 days.

With a few exceptions, none of my plants have gotten any bigger. Some have been sitting, with their two coteledin and their two true leaves, for over two months. They aren't yellowing, wilting, or dying. Nor are they growing. The same with the sprouts from seed - I have rows of two-leaved beet and carrot plants sitting for over 6 weeks, never getting any bigger, not looking sick in any way.

Any suggestions as to what the problem may be would be much appreciated!

Thanks!