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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 from new growth on dahlias, pel...

Take cuttings from pelargoniums and fuchsias Repot rooted cuttings into containers a size larger, to prevent them from becoming pot-boundCheck plants regularly for signs of pestsPinch out the tips of rooted cuttings to encourage bushy plants

Raise lettuce and salad crops in pots for early pickingsWater potted fuchsias sparingly to prevent compost drying out completelyPrune grapevines before they come into growth, when their sap starts risingBring pots of strawberries under cover to encourage early fruitingStart sowin...

Plant strawberry runners in hanging baskets, which you can grow in the greenhouse to produce an early summer crop Order seedlings and bedding plants from mail-order suppliersSow dwarf French beans in a large pot for an early crop in JunePlant lily

Sow seeds of greenhouse crops, such as tomatoes, cucumbers, peppers, chillis, aubergines and okra

Tie greenhouse tomatoes to their supports as they growFeed plants with full-strength fertiliser solution once a week, or apply a more diluted feed every few daysApply shading paint or put up shade netting or blindsOpen doors and vents daily

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