Hosta (Tardiana Group) 'Halcyon' plantain lily Position: partial or full shade Soil: fertile, moist, well-drained soil Rate of growth: average to fast-growing Flowering period: July and August Flower colour: lavender-grey Hardiness: fully hardy This is one of the smaller-leaved hostas, with smooth, lance-shaped, glaucous leaves and spikes of handsome, lavender-grey, bell-shaped flowers in July and August. It's a favourite of plantswoman Beth Chatto and makes a flourish at the front of a shady border, sheltered from cold, drying winds. The foliage is also invaluable for softening the edges of hard landscaping. Once established, its layers of leaves will suppress weeds, too. Garden care: You'll get thicker, lusher leaves if you give your hostas a really good feed. An annual mulch in spring or autumn will help to keep the weeds down and is an easy way to improve soil and boost nutrient levels. Add a generous mulch o...