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to encourage early fruitingStart sowing seed of summer bedding and crops that need a long growing season to mature, such as pelargonium, petunia, verbena, salvia, lobelia and begonia

-min thermometer to ensure heaters are working efficientlyPlant gloxinias, begonias, achimenes and cannas

, including African violets, begonias and Cape primroseHang yellow sticky traps over plants to catch whitefly and flying pestsSow seeds of herbs, such as parsley, chives, coriander, garlic, basil, dill, fennel, mint, thyme, sage and lovage

Watch Carol Klein as she guides you through the process of propagating delphiniums, campanulas and lupins; from taking basal cuttings and potting them on, to how to stake them.springMore advice on propagating plantsTaking begonia leaf cuttings

bulbs in pots either to use in the border or to add elegance to a patio displayRepot established agapanthus into slightly larger containers using a loam-based compostPlant begonia and gloxinia tubers in potsTake cuttings from dahlias planted last month

Plant out tender summer-bedding plants, such as begonias, once all risk of frost has passedLook out for aphids on lupins, and spray with a soap-based insecticide if infectedPush canes into pots of tall-growing lilies and tie their stems

are getting too highSow primulas, calceolaria, cineraria and cyclamenPinch out sideshoots on tomatoesPot up houseplants that have become top heavy or pot boundTake leaf cuttings from houseplants including Begonia rex, African violets, streptocarpus, crassula

Hang up yellow sticky traps to monitor and control whitefly and other flying pestsFeed begonias and other plants in potsTreat red spider mite with a biological controlTie ripening melons to sturdy supportsPot on rooted cuttings to keep plants growing

Feed tomatoes in growing bags and pots with a liquid high-potash fertiliser Plant nerines, lachenalia and veltheimia bulbs in potsTake leaf cuttings from begonias, Cape primroses and African violetsSow winter lettuces in potsPot up clumps of chives

of biological control nematodesDamp down the floor on hot days to increase humidityHarvest cucumbers regularly to promote further flower developmentPot up rooted cuttings into individual potsPlant pots of freesias and lachenaliaStop watering begonias