Christine,
Our Chard really stood up to the heat last year. We were eating it well into summer (at least late June, maybe longer), it also survived the summer and provided us in the fall. One even over wintered and is huge even though I keep feeding it to the chickens! Also, this year I planted some really late fall in the hugel bed. That's the same ones that you can see pictures of in our latest hugel pictures.
Don't give up on this plant! It is definitely one of our keeper greens!
