I'm trying that Earthbox experiment here in Hayward.

I transplanted two "cool weather" tolerant determinants (Siletz and Legend) March 17 to an Earthbox with with the plastic cover. The cover acts as a mulch to the soil and I placed it dark side up to absorb warmth. The plants are growing like crazy, loaded with flowers.

I'll report back my results. I am transplanting more varieties the second weekend in April, four to Earthboxes, 16 to a raised bed. It is a mixture of early and midseason det., indet. and dwarf plants.

I usually transplant between May 15-31 to try to catch the heat in September and October. My harvest typically starts in August. This year I am experimenting to see what happens if I start earlier. I'm predicting the earth box plants will do better than those in the bed due to soil temperature.