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Pot up rooted cuttings and young plants that have outgrown their potsSow seeds of marrows, courgettes, squashes, cucumbers and melons in a heated propagatorWater pots and trays of seedlings with a solution of copper fungicide to prevent damping

Plant summer bulbs, such as liatris, begonia, gloxinia, gloriosa, canna, eucomis and agapanthus Maintain frost-free conditions by installing a thermostatically controlled electric fan heaterBring pots of spring bulbs into the greenhouse to encourage

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

in as much light as possible Prune greenhouse vinesPick off faded leaves from plants to prevent spread of fungal diseasesSow lettuce, leeks and onions in a heated propagatorSow greenhouse tomatoes for early pickings

cover to continue cropping over winterVentilate the greenhouse on warm daysLine the glass with bubble polythene for insulationPropagate perennials from root cuttings including phlox, rhus and mintPlant bulbs in large pots of compost ready to fill any

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

eatenSow seeds of tomatoes, cucumbers, peppers and other greenhouse crops in a heated propagatorPot up begonias individually once new leaves have developedTake cuttings from houseplants including African violetsContinue sowing seeds of summer bedding

and grow bags with tepid water, if possible. Try leaving a few full cans of water in the greenhouse to warm upSend off for biological pest controls for whitefly and red spider mitePropagate lilies from bulb scales, digging bulbs from the garden to remove a

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

Wash greenhouse glazing to let in maximum lightBring potted cordylines under cover for winterInsulate your greenhouse with bubble polytheneMaintain plant hygiene, picking off faded blooms and dead leaves from all plantsWater plants more sparingly