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. The rhizomes should be divided every two years, after the plant has flowered in June.Iris pseudacorus 'Berlin Tiger'From May to July, Myositis scorpioides produces blue forget-me-not flowers. It can be planted in water, to a depth of 7.5cm (3in) or in wet mud

', 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

ichu looks set to become a first class ornamental grass. With silver panicles of summer flowers borne above bright foliage, it looks particularly good in a container.Jarava ichuAn excellent ground cover plant, Luzula nivea has wide, hairy leaves

Alexander-Sinclair share their top 10 plants for small gardens, which offer year-round interest and colour.The round-headed leek bears round flower-heads that open green and turn a deep red with maturity. It prefers full sun and well-drained soil

.Houseleeks are most valued for their distinctive rosettes of succulent, spirally patterned foliage, although they also bear attractive flowers from spring to summer. Each rosette is a separate plant, and is monocarpic - it flowers once then dies, but is soon replaced