growing tomatoes in isolation

growing tomatoes in isolation, this method has some frost protection benefits, a few nights now I've cover then in burlap and run a sprinkler.. -2C / 28F no problem under some cover. our weather is literally 29C with chance of frost this week. you can see some ripe tomatoes on the vine, a good result for our short 100 day frost free season. why are they isolated? for seed, all of these plants supply our seed shop, so to keep cross pollination to zero we isolate from pollinators. the plants are starting to grow into each other, but it's fine the only fruit we're going to collect set weeks ago, I could even take the cover off for this last week in the home stretch before harvest if it wasn't such a handy frost cover