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Protect pots of seedlings from the cold by making mini-cloches from empty plastic bottlesPrick out seedlings once they have developed their first true leavesOpen doors and greenhouse vents on warm days to improve ventilationSow herbs into pots

Tie greenhouse tomatoes to their supports as they growFeed plants with full-strength fertiliser solution once a week, or apply a more diluted feed every few daysApply shading paint or put up shade netting or blindsOpen doors and vents daily

Regularly water crops in pots and growing bags, daily if needed in warm weather Plant trailing tomatoes in hanging basketsFeed young plants weekly with a solution of liquid fertiliserVentilate the greenhouse during the day, but close vents

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

Buy plug plants and young bedding plants to grow on for baskets, pots and bedding displaysThin out heavy fruit sets on peaches and nectarines, leaving fruits about 10cm apartSow annual climbers, such as cup-and-saucer vine (Cobaea), nasturtium

strongly rooted plants that will survive the winterFeed crops in growing bags and pots every weekWatch out for vine weevil beetles and larvae, and treat compost with a suitable product such as Provado Vine Weevil Killer 2

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

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

Buy pansies and other winter bedding plug plants to grow on under coverDamp down the greenhouse floor every morning on hot daysWater plants in pots and growing bags every morning, and again at night if necessaryAdd liquid feed to at least one

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