I just want to remind most of the customers that purchased our heirloom tomato plants, that you should do some things that you would not normally do with the red field tomatoes.
First, I know I am a little late, but when you transplant them, you should put them on a mound at least one inch higher than the ground around it. Remember the heirloom is not like the hybrid seeds you get in the store that have built in pesticides in the plant.
Second, Make sure they have water. That hot streak should have had at least three waters. Once every three days unless it rain enough. When watering, it should be light and be soaked into the ground. At least a couple of applications per plant.
Finally, stake them and follow their growth. Once they start producing you have to check every other day. Unlike the red tomatoes they will spoil and die because of the tender outside skin.