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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 later in the year adult beetles e...

little more compost, then water again.More on growing herbsCreate a pot display of herbs for fish dishesGrow herbs for meat dishes in a potAdvice on creating a pot of herbs for vegetable dishesGrowing and harvesting herbs

Surround your roses with strongly scented companion plants, such as lavender, thyme, rue and garlic chives, to help keep aphids at bay. While gardeners are attracted by their beauty, rose pests are deterred by the herbs' strong scents. March - April

For a short but glorious time in June oriental poppies come into their own, providing flamboyant displays to enliven borders, says Carol Klein.Most gardeners yearn for a splash of glamour, and the most flamboyant of all June's flowers has

Pond plantsWater enhances any garden, and there are a wide range of aquatic plants that will thrive when submerged in a pond. We spoke to expert grower Linda Smith at BBC Gardeners' World Live 2009, who recommended 10 of the best plants for garden

, including African violets, cane-stemmed begonias, coleus, cyperus, impatiens, ivy, rubber plants and verbena.More on growing and caring for house plantsTaking stem cuttings from dracaena house plantsGrowing cactus plants from seedGrowing indoor amarylis

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