I live in South Carolina (37 C or 100 F everyday in July), but I love Rhubarb. I planted 4 rhubarb plants in the shade on the north side of my house. 3/4 have died and the last is struggling. They get lots of water. Is there anything else I can do to stimulate growth? Would potting them and bringing them indoors help?
Shortly after asking this question (3 wks ago), I build a Dirt wall around the rhubarb plants (2-3 inches tall, and 14 inches in diameter), which I have filled with around 3-4 gallons per plant everyday. The sandy clay takes some patients to wait for the water to soak in (before adding the rest of the water in small increments) and the soil is still moist the next day. With this extra attention the rhubarb has begun doing noticeably better--one has added 2 new leaves/stalks (it only had 3 before) and the other is still recovering. Thanks Mike Perry for the "ideas link" in your comment.
My sun-room doesn't get enough sunlight for rhubarb. I went to a local nursery that sells rhubarb and the plants were thriving outside in 90F heat. The only difference: they had a very porous soil vs. the clay I had tried growing mine in. I am now successfully growing rhubarb outside in 80-90 degree F heat. The soil MUST be porous. (+ daily watering)