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For foliage plants, one of the best genus to consider is Euphorbia. Nearly all evergreen and leaves variegated, glaucous, purple, red and all shades of green, they are amongst the handsomest of plants for foliar interest. On top of that they flower to add seasonal interest too and lift a border when in bloom with their chartreuse hues. From towering trees and bushes to diminutive rock plants, from Asia, Africa and America, their diversity makes them the largest genus in the world, 25 species being native to the UK. Timothy Walker, curator of the National Collection of Euphorbia at the Oxford Botanic Gardens, gives an in-depth, expert look at these fascinating plants, giving detailed botanical facts, cultivation details, propagation, pest and disease advice and ideas on their uses in the garden. From Euphorbia myrsinites for the rock garden, Euphorbia griffithii for moist soil, Euphorbia dendroides for the conservatory and Euphorbia amygdaloides var. robbiae for dry shade, there are varieties to suit every possible situation. And don't forget the ubiquitous Christmas poinsettia - Euphorbia pulcherrima. Part of the RHS Wisley handbook series, this is a comprehensive and concise look at the genus Euphorbia, fully illustrated and clearly written. Aimed at both the amateur and professional grower, this is an invaluable addition to any serious horticulturalists bookshelf. - Lucy Watson

Timothy Walker trained at Askham Bryan College, Savill Garden Windsor and the Royal Botanic Gardens at Kew and has been Horti Praefectus of the Oxford Botanic Gardens since 1988. He lives in Oxford.