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insideThin bunches of greenhouse grapesTake cuttings from pelargoniums, fuchsias, marguerites, penstemon, carnations, diascia and many othersDamp down the greenhouse floor each morning on hot days to increase humidityStand pot plants on capillary matting

Scrub off shading paint and wash the glass thoroughly inside and out Listen out for weather forecasts of early frosts and be ready to bring tender potted plants under coverVentilate the greenhouse on warm days, but close doors and vents every

Sow seeds of cucumbers, tomatoes, aubergines and peppers to raise summer cropsWater compost with a suitable pesticide where vine weevils have been discoveredSow summer bedding plants, such as petunias, geranium, verbena and busy LizzieTake cuttings from chrysanthemumsPick faded o...

Put up shading to reflect scorching sunlight and keep temperatures downOpen all vents on warm days, but close again in the eveningOrder plug plants and seedlings by post, and pot up as soon as they arriveTake leaf cuttings from houseplants, including African violets, begonias and...

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 to supportsIncrease shading and ...

Plant dahlia tubers in pots or trays, and place in a heated propagatorStart raising crops from seed, including tomatoes, chilli peppers, aubergines and cucumbersPrevent seedlings being affected by damping-off disease by watering compost with a solution of copper fungicideSow cycl...

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 and morning glory (Ipomoea)Grow an e...

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 can cause split fruits and blo...

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 perennialsHang up yellow sticky traps to ...

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 coldPlace poinsettias in the total dark ...