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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

and kalanchoePick peppers, tomatoes, cucumbers and other greenhouse crops regularly to encourage further flowers to develop

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

blinds and shade nettingSow sweet peas for early flowers next summerClear out old crops in pots and growing bags, adding them to the compost heapBring pots of late-flowering chrysanthemums under coverLine the inside of your greenhouse with bubble

Follow weather forecasts closely to ensure you're setting greenhouse heating accuratelyPrune both indoor and outdoor vinesDig up rhubarb, pot up, and place in total darkness under a giant bin to force an early cropThoroughly clean glazing inside

The temperature in my greenhouse is fluctuating wildly. It rockets during the day, when the weather is sunny, then plunges at night. The contrast is far more marked than at this time last year.This year I delayed sowing many crops, and I almost wish

for extra stabilityOpen all vents and prop doors open on warm days to improve ventilationBring large-leaved houseplants into the garden and hose them down to clean off dust. Wipe dry and apply a leaf shine for an attractive glossy finish before bringing back

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...