"Bob Hobden" wrote

Causes of Blossom End Rot are dry roots and/or acidic soil.

If your growbags are always moist then it must be the pH, worth checking.
If it is the pH then they were not good quality growbags and I would
suggest you don't use the same manufacturers again (and let us all know
the culprit).
The small fruiting varieties of Tom do not seem to suffer this problem.
If you use rainwater to water try using tap water provided it's hard
water.


Forgot to mention, you are using a tomato feed as it says on the bottle?

--
Regards
Bob Hobden