[en] Armitage's Manual of Annuals, Biennials and Half-Hardy Perennials

[en] The Art of Perennial Gardening: Creative Ways with Hardy Flowers

[en] Begonia grandis - Hardy Begonia

[en] Beyond the Camellia Belt: Breeding, Propagating, and Growing Cold-Hardy Camellias

[en] Delosperma cooperi - Hardy ice plant, Trailing ice plant

[en] Dirr's Hardy Trees and Shrubs: An Illustrated Encyclopedia

[en] Encyclopedia of Hardy Plants: Annuals, Bulbs, Herbs, Perennials, Shrubs, Trees, Vegetables, Fruits

[en] Fuchsia magellanica - Hardy Fuchsia

[cz] Gardenia jasminoides 'Kleim’s Hardy'' - gardénie

[en] Gardening with Hardy Geraniums

[en] Geranium 'Blue Blood' - Hardy Geranium

[en] Geranium cinereum 'Ballerina' - Hardy Geranium

[en] Growing Hardy Orchids

[en] Hardy Gingers: Including Hedychium, Roscoea, and Zingiber

[en] Hardy Rhododendron Species: A Guide to Identification

[en] Hibiscus moscheutos 'Disco Belle Pink' - Hardy Hibiscus

[en] Hibiscus moscheutos 'Disco Belle Red' - Hardy Hibiscus

[en] Hibiscus moscheutos 'Disco Belle Rosy Red' - Hardy Hibiscus

[en] Hibiscus moscheutos 'Southern Belle' - Hardy Hibiscus

[en] Hibiscus: Hardy and Tropical Plants for the Garden