Hahn's Self-Branching Ivy
Hall's Japanese Honeysuckle
Hawaiian Elf Schefflera
Hawaiian Heather, False Heather
Heartleaf Bergenia, Winter Bergenia
Heather Blush Bearded Iris
Hedge Lavender, Lavandin
Helene Strybing Manuka Tea Tree
Heliotrope Black Beauty
Hen and Chicks
Hidcote English Lavender
Holly Oak or Holm Oak
Hollyhock
Hollyleaf or Islay Cherry
Hollywood Twisted Juniper
Homestead Purple Verbena
Honey Bush
Honey Myrtle, Granite-Bottlebrush
Honeywort
Hopseed Bush, 'a'li'i