Bob Hobden wrote:
Ed wrote ...
There are two reasons why blossom end rot occurs, irregular watering or
it's a calcium deficiency.

Agree.
Our new allotment plot has a low pH and whilst I limed the Brassica plot
heavily I didn't think about the Toms and am suffering with BER as the acid
soil (pH5.5) does not allow the plants to get enough calcium. Next year I
will raise the pH where the Toms will go.

I use an automatic watering system and if anything at times they were
over watered but never dry. I feed Wed and Sat with liquid tomato feed
so again this should not be a problem. I grow 3 to a grow bag.

This is what I have always done with little or no BER, this year for the
first time I have a lot of it. Temp in the summer have reached 40 even
with everything open, now they don't get over 23 or 24.