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Sun-loving tomatoes can suffer outdoors during spells of cold weather, with ideal temperatures from 18-24˚C and no lower than 13˚C. If it is too cold there might be poor pollination, curling of leaves and the fruits might be scarred, with holes.Tomato

Fluctuating growth rates cause tomatoes to suddenly expand. This might happen after a period of drought followed by generous watering, or low temperatures followed by a sudden sunny spell. The split might then become infected, causing the tomatoes

to other plants. Carry out repeated, preventative spraying the moment the first batch of tomatoes starts to set. Use fungicide containing copper. They don't provide 100 per cent protection, but an attack will be slowed down and you should get ripe tomatoes

The fungus that causes this problem spreads rapidly in the warm, humid conditions of a greenhouse. It usually becomes apparent on the lowest tomato leaves from early or midsummer, which develop yellow blotches on the upper leaf surface. The leaves

can encourage the problem. Compost sold specifically for tomatoes, such as grow bags, contains sufficient calcium for a good crop of fruits. Never apply fertiliser to dry soil, always give plants plenty of water first. tomatoes, peppers

Monty Don demonstrates how to plant tomatoes in grow bags and pots in the greenhouse at Berryfields, including advice on getting the most from grow bags, and when to put tomato plants outside.springMore advice on growing tomatoesGrowing tomatoes

't successful, nip out the remaining bit and remove it without damaging adjacent growth.More advice on growing tomatoesJoe Swift's video guide to growing tomatoes from seedGrowing tomatoes in pots and grow bags, with advice from Monty DonMethods for controlling

Greenhouse tomatoes are often planted in grow bags, but outdoor crops can also be grown in this way too. A good alternative to a specialist grow bag is to try planting in a 60 or 75 litre sack of multi-purpose compost. This will provide your plants

Monty Don demonstrates how to plant tomatoes in grow bags and pots in the greenhouse at Berryfields, including advice on getting the most from grow bags, and when to put tomato plants outside.springMore advice on growing tomatoesRead Kate Bradbury

Saving seed from your favourite tomatoes is a simple process and could save you money on buying seeds next year. If you grow more than one variety it's likely bees will have cross-pollinated them, so you could be growing your own brand new variety