Where to buy
• Avon Bulbs Burnt House Farm, Mid Lambrook, South Petherton, Somerset TA13 5HE. Tel 01460 242177, avonbulbs.co.uk • Beth Chatto Gardens Elmstead Market, Colchester, Essex CO7 7DB. Tel 01206 822007, bethchatto.co.uk • Majestic Trees Chequers Meadow, Chequers Hill, Flamstead, Nr St Albans, Hertfordshire. AL3 8ET. Tel 01582 843 881, majestictrees.co.uk
• Marchants Hardy Plants Iris unguicularis ‘Walter Butt’ Produces sweetly scented, pale-blue flowers on and off from Christmas until the end of March. Will put up with dry conditions and light shade. Trim off any untidy foliage to show off the flower to best advantage. 45cm.