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Prick out petunia seedlings once they've developed two true leavesSow French and runner beans in pots Put up greenhouse shade netting if the sun is out and conditions are hotPlant up hanging baskets and patio pots with summer beddingBuy young plants

Fit automatic openers to greenhouse vents to encourage good air circulationPlant tomatoes in growing bags or large pots, training them on to canes or wires for supportBring pots of strawberries into the greenhouse to produce early flowers and fruit

Damp down the floor every morning and open ventsWater tomatoes regularly to prevent fruits splittingSow Primula malacoides and P. obconica for flowering pot plants next springHang yellow sticky traps in the greenhouse to help control whitefly

Take cuttings from pelargoniums and fuchsias Repot rooted cuttings into containers a size larger, to prevent them from becoming pot-boundCheck plants regularly for signs of pestsPinch out the tips of rooted cuttings to encourage bushy plants

, 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

Water crops in growing bags and pots daily, adding a liquid feed once a weekIntroduce biological controls if you have discovered pests, such as whitefly and red spider mitePinch out developing sideshoots on tomato stemsTrain cucumbers and tomatoes

Plant winter salads in guttering or growing bagsCheck heaters are working efficientlyClean staging and wash capillary matting to use next summerLine greenhouses with bubble polythene for insulationBring pots of tender bulbs, like agapanthus

Plant hippeastrum bulbs for spring displaysInsulate your greenhouse with bubble polythene for insulationVentilate greenhouses on warm, dry daysUse rainwater to keep the compost of potted azaleas constantly moistCheck fuel levels in paraffin and gas

and grow bags with tepid water, if possible. Try leaving a few full cans of water in the greenhouse to warm upSend off for biological pest controls for whitefly and red spider mitePropagate lilies from bulb scales, digging bulbs from the garden to remove a

Sow onion seed under cover, and keep warm until germinatedCheck overwintering plants for signs of greenfly and other pests, and treat if necessaryBring potted strawberries under coverDig up clumps of rhubarb to force into growth in darkness under