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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 tomatoes in large pots or growing bagsOpen all vents on warm days, or install automatic vent openers, to encourage good air flowSow tender primulas, such as Primula obconica, P. kewensis and P. sinensis, to grow on as houseplantsTake cuttings

Pinch out tomato sideshoots developing from the main stemFit automatic vent openers to help control air flow and fit extra low-level louvre vents if requiredTie in tomato shoots to their supports. Water daily to prevent the compost drying out, which

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

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

Train cucumbers and prune back sideshootsPick off flowers on coleus to maintain their colourful leavesWater tomatoes regularly to prevent fruits from splittingTake cuttings from fuchsias, coleus, pelargoniums, marguerites and other tender perennials

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

greenhouse tomatoes to deter whiteflySet up a 'watering bench' using capillary matting to look after pot plantsSow seeds of Christmas cherry (solanum) to grow as winter pot plantsHang yellow sticky traps in the greenhouse to help control whitefly Thin out

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

Plant prepared hyacinth bulbs in special hyacinth vases (available at garden centres) or in pots of bulb fibreSow parsley in modular traysWater crops in growing bags and potsOpen vents each day, but close them at night if the weather turns cold