Try some Miracle Grow Tomato fertilizer. Mix a tablespoon per gallon of water and pour it around and on the plants. The leaves absorb nutrients too. It's called a "drench." Needs a couple of weeks before you'll see results.

If you use too much nitrogen, your next posts will be about flower drop.

From reading some forums, it appears the new clay soil bed is to blame. It certainly does better after a long soak from the rain, but not from hose water. It is too late to amend the soil and I'll try to put on more mulch.....

Actually I was wrong. The clay soil is not to blame. Blame the bugs.

When I touched the plant, a lot of little bugs flew away. They are tiny light colored things, maybe light green or so. Can't tell.

Closeby, I have 3 Greek basil plants and they attract even more bugs. I think some are leaf hoppers or so, the tiny green bugs.

The bugs suck off the leaves. The leaves fall.....