i just watered them yesterday i haven't watered them since the storm we had a couple weeks or so ago.
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They will need watering more regularly if the heat is extreme, at least weekly, even if you get a storm as most storm water is lost thru runoff but when you do water, soak the soil deeply. Mulching will help.
Some shadecloth scraps over the
plants may help prevent heat stress too.
Blossom end rot is usually from a calcium deficiency and it can also come from moisture stress. If both of these factors are present, even if there is calcium available to the
plant, it can be carried to the leaves where the moisture is transpired out, leaving none for the
growing fruit. Calcium can be supplied by a side dressing of dolomite but it's slow acting and should be applied at the soil preparation stage.
There are liquid forms of calcium available, but they won't correct the damaged fruit, only the developing ones. Seaweed extract has a good calcium content and it would help the
plant to overcome the stress also.
Excessive nitrogen can also increase the severity of blossom end rot, so lay off the high nitrogen ferts. Something like 5:10:10 would be more suitable but not until the
plants have retained their vigour.
Your
plants sound as though they are in a state of extreme stress, so mulch heavily after a thorough, deep watering, apply some seaweed extract to the rootzone, remove all affected fruit, cover with some shade on extreme days and they should recover OK. If there is calcium already in the soil, they'll take it up once the roots develop a little and the moisture levels have remained constant for some time.