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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

Chris Beardshaw demonstrates a method for training greenhouse tomatoes, intended to increase fruiting yield.summerMore on growing tomatoesRead Kate Bradbury's blog on the dos and don'ts of growing tomatoesGrow tomatoes from seedGrow tomatoes outsideGrow

Discover how Chris Beardshaw ripens tomatoes on the vine after lifting the whole plant, in our step-by-step video guide, with advice on how and where to store the plant. autumnMore advice on growing tomatoesVideo advice on growing tomatoes outdoors

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

. Grow strong-smelling plants, such as French marigolds, alongside your tomatoes as a deterent. Every two to three days spray the underside of leaves with a soap-based spray containing fatty acids to kill emerging adults. When the temperature remains

Sarah Raven offers advice on which tomato varieties to grow, and demonstrates how to sow tomato seeds in coir pellets.springMore advice on growing tomatoesGrowing tomatoes in pots and grow bagsGrowing tomatoes from seedGrowing tomatoes outdoorsGrowing

, they don't need much space to grow, so you won't need to thin them out. They also grow over a long period, so you can harvest the leaves in winter and early spring.Cut-and-come-again salad leavesBush tomatoes are easier to grow than cordon varieties

Tomatoes are easy to grow from seed and should germinate within two weeks. Compact cherry varieties can be grown in pots and hanging baskets, while larger, cordon types are more suited to being raised in the ground or in growing bags. Tomato seeds

For the boldest, brightest display in a hanging basket choose a large container (no smaller than 35cm) and pack it with plants. But keeping them flowering is thirsty work, so for a really successful show the plants will need plenty of water on a regular basis.Hanging basket Water...