heirlooms are huge, but no fruit.
Well, summer is well underway here and my hybrids are setting fruit and doing well, but the heirlooms are making huge plants but no fruit. There are flowers on the plants, they just arn't setting any. Temps have been in 100's but I've got the tomato patch shaded from noon sun with a canopy. can I do something to encourage fruit set on the heirlooms, or do I just bide my time and wait for temperatures to cool off in the fall?
These plants were store bought, will saving seed from these heirloom plants and growing out next year result in plants better tolerant to my climate?