Plants
- Kabitan Hosta
- Kaffir LilySchizostylis coccinea
- Kaffir lily 'alba'Schizostylis coccinea 'alba'
- Kaffir lily 'Major'Schizostylis coccinea 'Major'
- Kaffir lily 'Sunrise'Schizostylis coccinea 'Sunrise'
- Kaffir lily 'Viscountess Byng'Schizostylis coccinea 'Viscountess Byng'
- Kale 'Lacinato'Brassica oleracea 'Lacinato'
- Kale 'Nero di Toscana'Brassica oleracea var. ancephala Nero di Toscana
- Kale (Blue Curled)Borecole
- Kale Dwarf green curledBrassica oleracea var.ancephala Dwarf green curled
- Kalimeris incisa 'Madiva'Kalimeris incisa 'Madiva'
- Kalimeris yomena 'Shogun'Kalimeris yomena 'Shogun'
- Kalmia angustifolia f. rubraKalmia angustifolia f. rubra
- Kalmia polifoliaKalmia polifolia
- Kangeroo PawAnigozanthus flavidus (Red Form)
- Kanjiro CamelliaCamellia sasanqua "Kanjiro"
- KapukaGriselinia littoralis
- Kelsey's Dwarf Red-Osier DogwoodCornus sericea 'Kelseyi"
- Kentia PalmHowea Forsteriana
- Kerosene BushOzothamnus ledifolius
- Kerosene Bush, Sea RosemaryOzothamnus rosmarinifolius
- KerriaKerria japonica
- Kerria japonica 'Pleniflora'Kerria japonica 'Pleniflora'
- Kidney OrchidRenanthera monachica
- Kilmarnock WillowSalix matsudana tortuosa
- King Edward YarrowAchillea tomentosa 'King Edward'
- King tutEyptian reed grassi
- Kingcup, Marsh MarigoldCaltha palustris var. alba
- Kipfler PotatoSolanum tuberosum 'Kipfler'
- Kirengeshoma koreanaKirengeshoma koreana
- Kirengeshoma palmataKirengeshoma palmata
- Kitaibela vitifoliaKitaibela vitifolia
- KiwanoCucumis metuliferus
- KiwiActinidia kolomikta 'Dr. Szymanowski'
- KleiniaKleinia senecioides