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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

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

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

Keep potted herbs on the staging to crop over winterMove potted bulbs into the greenhouse to develop before bringing into the houseClear out old crops and growing bagsWater sparingly and aim to keep the atmosphere as dry as possible over winter

can cause split fruits and blossom end rotThin out bunches of grapes with pointed scissorsPinch out shoot tips on coleus to encourage plants to branch, and remove any flowers that formPropagate pelargoniums from cuttings during July and August to grow

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

Take cuttings of zonal and regal pelargoniums, and pot up rooted cuttings taken earlierTrain the main stem of cucumber plants up a wire to the roof of your greenhouse. Pinch out sideshoots two leaves after a flower or fruitWater plants in pots

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