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.tulipsspring, autumnMore advice on growing tulipsTreating tulip virusLayering bulbs in a potPicking tulips video projectPlanting a spring window box

appear rotten or pitted.Dig up and destroy affected bulbs, and in the case of the tulip breaking virus don't plant your tulips near lilies, which can carry the virus without showing any symptoms. Avoid replanting where affected bulbs were growing

Viburnum beetle was named as the number one pest by the RHS in 2010, stealing the crown from slugs and snails. It's native to the UK, but is becoming more widespread. Most of the leaf damage is caused by the stripey, beige-coloured larvae, though

after flowering to promote new growth, which you can use over winter.May-OctoberMay-October30 minutesBay, Laurus nobilis x1Flat-leaf parsley, Petroselinum crispum x1French tarragon, Artemisia dracunculus x1Greek sage, Salvia officinalis 'Greek' x2Lemon

June - August20 minutesRue, Ruta graveolens 'Jackman's Blue'Miniature patio roses x2Pale green thyme, Thymus pulegioides 'Foxley'Garlic chives x3Small lavender, such as 'Munstead' x3Window boxCrocksPeat-free multi-purpose compostPlace the crocks

.The flower stems are strong and tall, up to 1.2m (4ft), and each supports a single magnificent bloom, blood red and boldly imprinted at the base of each petal with a jet-black splodge. The stamens, arranged in a broad circle around the dark, central knob

at a pond margin. It can be divided or grown from seed in spring.Myosotis scorpioidesThis miniature water lily spreads about 30cm (12in), with each flower and leaf being just 2.5cm (1in) in size. Given a sunny position it will flower from June

and summer bedding plants can also be propagated by this method.Plectranthus house plantScissorsJar of waterPlant potsMulti-purpose compostall year roundan hourChoose healthy shoots of new growth and cut lengths of roughly 10-20cm. Cut below a leaf joint

If you want a spring-flowering display to go on as long as possible, plant separate layers of different varieties of bulbs in one pot. All you need to create a display which flowers in succession is a large pot and a variety of bulbs that will flower at different times.Deep potCo...

Discover how to add midsummer colour and interest by growing a clematis against a teepee. Sarah Raven explains how to encourage budding below soil and reduce the risk of clematis wilt.summerMore advice on growing clematisMonty's advice on growing