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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

Hand pollinate the flowers of peaches and nectarine, with a soft brushCut off hippeastrum flower heads, leaving the stalkSow summer-bedding plants in trays in a heated propagator or in the greenhousePlant dahlia tubers in trays to encourage shoots

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 canna lilies in pots, and leave in a warm positionSow strawberry seeds, including alpine varietiesVisit garden centres to buy young bedding plants that can be grown on to a larger size under glassCut off dead hippeastrum flowers, but allow

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

of biological control nematodesDamp down the floor on hot days to increase humidityHarvest cucumbers regularly to promote further flower developmentPot up rooted cuttings into individual potsPlant pots of freesias and lachenaliaStop watering begonias

immediatelySow sweet peas in pots for early flowers next summerTake cuttings of succulents such as sedumsMove potted peaches and nectarines under coverBring pots of late-flowering chrysanthemums into the greenhouseStop watering pots of achimenes, gloxinia

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

and eucomis into the greenhouse for the winterLet achimene, gloxinia and gloriosa die down in their potsKeep potted azaleas constantly moist using rainwaterPlant bowls with hyacinths and spring bulbsCheck greenhouse heaters are in working order and that you

the greenhouse border and dig in fresh compostPlant dwarf irises, hyacinths and crocuses in potsRemove faded leaves and flowers from plants to prevent grey mould spreadingVentilate greenhouses on warm days but close vents at nightCover poinsettias to give them