'Ibo nishiki' Japanese Maple 'Iceton Yellow' Garden Croton
Ichang Viburnum 'Icicle' Common Peach
'Imperial Blue' Cape Leadwort 'Inca Gold' Conebush
Incense Cedar 'Zebrina' Incienso
'Incrediball®' Smooth Hydrangea: arborescens Indian Azalea
Indian Cigar Golden Indian Hawthorn 'Clara'
Indian Hawthorn 'Fascination' Indian Hawthorn 'Olivia'
Indian Mallow (spp.) Indian Mallow, Palmer's
Indian Mallow, Red Vein (spp.) Indian Mallow, Red Vein 'Gold Dust'
Indian Mallow, Red Vein 'Thompsonii' Indian Mulberry
'Indian Summer' Rose Indica Azalea (spp.)
Indica Azalea 'Kate Arendall' Indigo Bush: schottii
Indigo (spp.) Indigo 'Rose Carpet'
Indigo, Bastard Indigo, Chinese (spp.)
Indigo, Chinese White Indigo, Himalayan
Indigo: amblyantha Indigo: kirilowii
Indigo: nigrescens Indigoberry, White
'Ingrid Bergman' Rose Ink Bush
Inkberry Inkberry Holly (spp.)
Inkberry Holly 'Chamzin (Nordic™)' Inkberry Holly 'Compacta'
Inkberry Holly 'Densa' Inkberry Holly 'Ivory Queen'
Inkberry Holly 'Nigra' Inkberry Holly 'Red Tip'
Inkberry Holly 'Shamrock' 'Innocence' Lemoine Mock Orange
'InSpired® Pink' Butterflybush: Buddleia 'InSpired® Violet' Butterflybush: Buddleia
'InSpired® White' Butterflybush: Buddleia 'Intermedia' Japanese Yew: cuspidata
'Intrigue' Rose 'Invincibelle® Spirit' Smooth Hydrangea: arborescens
Iochroma Iochroma: grandiflora
'Irene Paterson' Kohuhu 'Irene™' Rosemary
Irish Tutsan 'Iroshidori' Hybrid Hydrangea: hybrid
Island Bush Snapdragon Island Gooseberry
Island Shrub Mallow Island Tree Poppy
Islay 'Isle of Capri' Oleander
'Issai' Purple Beautyberry Italian Buckthorn (spp.)
Italian Buckthorn (spp.) Italian Yellow Jasmine
'Ivory Queen' Gallberry Holly Ivy, Aralia 'Aureopicta'
Ivy, Bush 'Aureopicta' Ivy, Tree 'Aureopicta'
'Izu No Hana' Bigleaf Hydrangea 'J. L. Pennock' White Enkianthus
'J.C. Williams' Camellia 'Jackmanii' Shrubby Cinquefoil
Jacobinia Jacob's Coat (spp.)
Jacob's Coat 'Haleakala' Jacob's Coat 'Louisiana Red'
Jacob's Coat 'Obovata' Jacob's Coat 'Petticoat'
'Jacqueline Postill' Nepalese Paper Plant Jade, Baby (spp.)
Jade, Baby Variegated Jamaica Caper
'Jamaica' Rose Jamaica Sorrel
Jamaica Vervain Jamaican Croton (spp.)
Jamaican Croton 'Chocolate' 'James Macfarlane' Preston Lilac
'Jane' Magnolia 'Janet Craig Compacta' Dracaena: deremensis
'Janet Craig' Dracaena: deremensis 'Jan's Wedding' Rose