Perhaps you people can help. Last couple of years, I plant, say, a 6-pack of lettuce or chard, and they right away bolt to seed and don't produce much in the way of leaf. Is it heat/light, water, or soil? I'm in Portland, OR.
A few years ago I had a good crop of Chard, and it even over-wintered - I had greens all year long. Now it seems all I can get is seed from plants in the same location.