Iris sibirica

Siberian Iris (UK and USA J This versatile iris is suitable for a herbaceous border as well as the margins of an informal pond The slender, sword-like, mid-green leaves die down in winter The flowers are aboul 6 5cm (2J£in) wide and are borne during mid-summer. In the original species, they are in various shades of blue, with white veining on the 'fails' [the three outer petals). Because the original species hybridizes freely, usually only hybrids are available Good ones are Heavenly Blue' [rich azure blue), 'Cambridge' (pale blue). 'Ottawa (clear light blue), Tropic Night' [velvety violet) and Perry's Blue' (deep blue).

Height: 75cm-1m [2j£-3>2ft) Spread: 45-60cm (1!-v2ft) Cultivation: It grows best in moist soil, but will also perform well in a herbaceous border where it does not usually grow so high. Plant the rhizomes 2-5cm (lin) deep in the soil during autumn or spring. Propagation: It is easily increased by lifting and dividing congested clumps in late autumn or spring Re plant the divided rhizomes2-5cm (tin) deep Large clumps tend to become hollow and bare at their centres, and are therefore best lifted and divided at least every four or five years to keep them healthy

Above Iris sibirica Heavenly Blue This is a hardy iris for a border or the moist margin of a pond, lis rich blue flowers are borne two or three to a stem above the grassy sword-like leaves iris sibirica planted m a moist area mixes wel. with ye:low-flowered plants such as the fragrant Himalayan Cowslip Primula sikkimensis. and P he&odoxa It also looks good in a border against an old wai.

Left Liatris caililepis Kobold

The frothy flowers of this tuberous rooted herbaceous perennial are a delight during mid-summer to early autumn. The flowers are useful for home decoration

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