Helleborus
Bearpaw Hellebore: Helleborus foetidus, Clifton Homestead Nursery, Dave's Garden: Helleborus argutifolius, Floridata: Helleborus orientalis, Gardenweb: Hellebore Forum, Hellebores, Hellebores, Hellebores, Hellebores, Helleborus.com, Ketzel Levine's Talking Plants: Helleborus, Sunshine Farm and Gardens: Focus on Hellebores
Hemerocallis
Associations, AHS Daylily Dictionary, Caragana Country Acres, Charlotte's Daylily Diary, CHARMnRON Daylilies, Cyberlily Gardens: Daylilies, David Flathman's Daylily Collection, Daylilies by the Lake, Australia, Daylilies Growing Along The Information Highway, Daylilies in the Aucoin Gardens, Daylilies Online
Hibiscus
Australian Native Hibiscus and Hibiscus-like Speci, Hibiscus 101, Basics and Beyond, Hibiscus rosa-sinensis in Pots, JE Ludick, Strictly Hibiscus, Tropical Hibiscus, Tropicalgardening.com: The Glamorous Hibiscus
Hippeastrum
Amaryllis, Amaryllis Culture, Amaryllis Culture and Care, Amaryllis Home, Amaryllis Makes Memorable Holiday Gift, Amaryllis Planting and Care, Amaryllis, Year-Round Care, Better Homes and Gardens:Amaryllis Flowers, Home Forcing of Potted Amaryllis (Hippeastrum), Waking the Amaryllis
Hosta
Associations, Chats and Forums, Personal Pages, American Hosta Growers Association, Dividing Hosta, Fraternal Order of Seedy Fellows, Giboshi Arekore, Giboshi.com, Growing Hostas, Hints on Successful Tissue Culture Propagation of , Hosta Has Much to Recommend It, Hosta Library, Hostas Galore