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Blossom end rot is caused by calcium deficiency. Without calcium, a plant's cell walls collapse and die, resulting in the bruised appearance of the fruits. Plants take up calcium from the soil through their roots, so if it's dry, the calcium stays

hot spells and provide shading. Promptly pick off any split tomatoes before they start to rot.tomatoessummer to autumnCommon problems affecting tomatoesTomato leaf mouldTomato blightTomato frost damageBlossom end rot

can cause split fruits and blossom end rotThin out bunches of grapes with pointed scissorsPinch out shoot tips on coleus to encourage plants to branch, and remove any flowers that formPropagate pelargoniums from cuttings during July and August to grow

Water tomatoes regularly to prevent fruit splitting and blossom end rot Feed tomato crops with a high-potash tomato fertiliser every weekBe on the lookout for aphids, vine weevils and other pestsVentilate daily and add extra shading if temperatures

.tomatoessummerMore problems affecting tomatoesTomato leaf mouldTomato splittingTomato frost damageBlossom end rot

and choose resistant varieties such as 'Dombello' and 'Shirley'.tomatoesmid-spring to autumnCommon problems affecting tomatoesTomato blightTomato splittingTomato frost damageBlossom end rot

Courgette rotCarrot flyGrey mould on soft fruitsBlossom end rot on tomato plants

are commendable, if nothing else. There are friends who grow the plants indoors and wonder why they don't fruit (the flowers need pollinating); friends whose plants flower and fruit but the tomatoes rot at the ends (blossom end rot caused by irregular watering

as large a yield as other varieties of tomato.I don't even think those beefsteak tomatoes that did ripen had a particularly good flavour, either. And while I'm having a rant, I often experience blossom end rot on beefsteak tomatoes, a problem I rarely see