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attractive to butterflies and moths. If left to seed, it will naturalise all over the garden.Verbena bonariensisThis climbing evergreen provides a supply of nectar and pollen until late November. Holly blue caterpillars also feed on its leaves, while many

Free and easyFavouring a more laid-back approach to gardening, I love plants that self-seed with abandon. Here are a few of my favourites...Find out how to collect allium seedsSelf-seeders are the opportunists of the plant world. They may

In the heat of summer, this showy pot will bring a taste of the tropics to your garden. The huge, red-tinged banana leaves flounce above a frothy skirt of blue-grey parrot's beak and honey bush, and fiery begonias. April - JuneJune - September30

', blue clouds of catmint and Russian sage.Planting companionsSome shrubs also make great companions, such as euphorbias, geums and Anthriscus sylvestris 'Ravenswing' with the warmer-coloured iris flowers, or cistus and artemisia for the cool blues

All plants need nitrogen, potassium and phosphorous to thrive, plus various trace elements. Without nitrogen the leaves turn yellow and growth is spindly. Potassium generates good flowering and fruiting and helps ripen wood. Plants lacking potassium

Heliotropum arborescens 'Butterfly Blue' x 4Nemesia caerulea x 4French lavender, Lavandula stoechas x 440cm plastic-coated wire basketMulti-purpose compostWool basket liningSlow release fertiliserWater-retaining gelPlace a layer of wool or alternative lining in the bottom

in height.Pennisetum 'Red Buttons'A striking blue grass with mounds of slender foliage and lovely silvery flower heads. Poa labillardierei makes an elegant addition to borders.Poa labillardiereiWhere to see grassesKnoll GardensRoyal Botanic Gardens, Kew

that the only way to tackle a shady patch is to turn it into a foliage garden filled with box, ivies and ferns. But too many dark greens can make a shady area look gloomy. Instead, use them for background structure and texture, then bring the area alive

Plants for small gardensSmall gardens can accommodate a wide range of plants, from spring bulbs to small trees. We spoke to Monty Don and James Alexander-Sinclair at Gardeners' World Live to discover their top 10 plants for small gardens.A small

Sempervivum and jovibarbaSempervivums, or houseleeks, are hardy, succulent, alpine plants that grow in the wild between rocks in mountainous regions. We picked out ten of the best varieties at BBC Gardeners' World Live 2009.Sempervivum means 'always