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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...

an existing greenhouse and know the name of the manufacturer, contact them first to see if they can supply a kit before heading for the DIY store.More on saving and using waterSaving water in your gardenAdvice on watering plantsInstalling an automatic watering

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

from chrysanthemumsPick faded or yellowing leaves from plants to prevent grey mould infectionsRaise crops in modular trays to transplant into the garden later, such as celery, celeriac, lettuce, parsley and other herbs

Joe Swift's video guide to growing tomatoes from seedMonty Don's advice on growing tomatoes in pots and grow bagsMethods for controlling tomato blightDealing with tomato leaf mouldProtect tomatoes from frost damageHow to grow tomatoes in a greenhouse

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

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