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Turn over a leaf and you'll see 2mm long white flies. With a life cycle of just three weeks, whitefly breed very fast. Both adults and offspring are sap feeders and a severe attack will weaken a plant. They excrete the sticky excess, called honeydew

Spores carried by water and wind spread this fungus, which leaves primula foliage peppered with holes. The initial signs are spots in a yellow-orange area, or in grey, papery tissue. When the centre falls out, holes appear. Look beneath the leaves and there may also be white fung...

Whether you’re looking for a bright bedding display, flowers for cutting or reliable border plants, it’s hard to beat the variety offered by dahlias. Dahlias come in many sizes, so there's one for every border, and small forms can also be grown

. Dahlia plantSticks or canesStringJune - August15 minutesJuly - SeptemberCheck dahlias each week; if they're starting to flop tie the main stem to a supporting cane or stick with garden string. Don't tie the string too loosely, but allow a little room

Sarah Raven offers video advice on planting eucomis bulbs in a pot, including information on drainage, compost and planting depths.springMore advice on growing exotic plantsCaring for cannas video project with Carol Klein.Growing exotic plants from

bedding to provide nutrients for the whole growing season.Fertilisers are also available to mix up with water for liquid application. Liquid concentrates and ready-to-use liquid feeds are also available. These are quick acting as the plant roots can take

Summer is the ideal time to take leaf cuttings from your houseplants. A single leaf can produce many young plants, and this technique is particularly useful for foliage plants such as Begonia rex.Healthy begonia plantClean, sharp knife and cutting

garden pestsAphidsMealybugsWhiteflyScale insectsChoose plants to grow in full sunBrowse plants by soil type

staging or a dry shed.AdamIf your dahlias are in a warm, sheltered spot in the border and you don't want to lift them, add a thick layer of mulch for extra insulation in winter.Caring for your dahliasVideo guide to taking dahlia cuttings, with Sarah Raven.Planting

Summer is the ideal time to take verbena cuttings. Overwinter the semi-hardy perennials in a frost-free place and you'll have a fresh, healthy supply of verbena plants next year to replace any in the garden that have been killed by frost