Blossom end rot

morg_monster

Hi
Found 2 tomatoes with blossom end rot while looking up through my tomato plants. They are alicantes, both on one plant, of 3 in a growbag in a plastic film "greenhouse" that actually is never zipped up now. Everything I've seen online says that it is caused by irregular watering; but I water them every evening up to 1.5-2 litres per plant depending on what the weather has been like. I have a couple of small slits in the growbag to check they aren't getting waterlogged. They get fed with tomorite every week.
Anything else I can do or should I just hope its a one off? Did think about splitting the water over a couple of sessions, but in the morning they are still damp from the water the night before and due to work I can't water during the day.

Daftanian

Blossom end rot is caused by an imbalance of potash and calcium in the compost, which most often develops if the compost is allowed to dry out while the fruits are swelling. It is most common when plants are grown in grow bags, where they have a small, shallow root run that dries out easily. Once a fruit is affected there is no cure but further occurrence is most easily prevented by ensuring that the compost never dries out. A foliar feed with calcium nitrate will help to restore the proper balance of nutrients which is so often upset by overuse of high potash fertilisers.

The problem with grow bags can be alleviated by placing an 8 inch deep, 8 inch diameter, ring full of compost over each of the three holes made in the growbag and setting your tomatoes out in these rings. This gives each plant extra compost and a larger root run which will not dry out so quickly. 'Alicante' can apparently be quite prone to blossom end rot.