Kennedy's Buckwheat Kentucky Coffee Tree Variegated
'Keown' Monterey Cypress 'Keteleeri' Eastern Red Cedar
Key Thatch Palm 'Kim's Knee High' Purple Coneflower
'Kim's Mophead' Purple Coneflower 'King Edward VII' Red Flowering Currant
King's Spear: himalaicus Kinnikinick (spp.)
Kinnikinick 'Massachusetts' Kinnikinick 'Microphylla'
'Klaus Jelitto' Stokes' Aster 'Klein #1' American Holly
'Kleinburg' White Ash Knotweed: virginianum (spp.)
Knotweed: virginianum 'Compton's Form' Knotweed: virginianum 'Lance Corporal'
Knotweed: virginianum Variegated 'Knowles Ryerson' Ceanothus: hybrid
'Kobold' Spiked Blazing Star Korean Mint 'Golden Jubilee'
'Koster' Colorado Spruce 'Kosteri' Eastern Red Cedar
Kralalwyn Aloe Labrador Violet
Lace Cactus 'Lace Parasol' Winged Elm
Ladder Fern: spicant 'Lady Alice' American Holly
'Lady in Black' Calico Aster 'Lady in Red' Scarlet Sage
Lady of the Night 'Ladybird Scarlet' Sulphur Cosmos
Ladyfinger Cactus Lady's Leek
Lady's Slipper, Pink Lady's Slipper, Showy
Lady's Slipper, Yellow Ladyslipper Orchid
Lambkill 'Royal Dwarf' Lambstongue Trout Lily
'Lance Corporal' Knotweed: virginianum Lanceleaf Coreopsis (spp.)
Lanceleaf Coreopsis 'Baby Sun' Lanceleaf Coreopsis 'Goldfink'
Lanceleaf Coreopsis 'Sterntaler' Lanceleaf Cottonwood
Lanceleaf Stonecrop Lanceleaf Thermopsis
Lanceleaf Tickseed (spp.) Lanceleaf Tickseed 'Baby Sun'
Lanceleaf Tickseed 'Goldfink' Lanceleaf Tickseed 'Sterntaler'
'Lancifolia' Allegheny Serviceberry 'Lanciniata' Staghorn Sumac
'Lane' Lawson's Cypress 'Lane's Aurea' Lawson's Cypress
Lantana, Dwarf Lantana, Gold
Larch, American Larchleaf Goldenweed
Large Flower Wakerobin Large Flowered Bellwort
Large Flowered Trillium Large Fothergilla (spp.)
Large Fothergilla 'Huntsman' Large Fothergilla 'Morton'
Large Leaved Cucumber Tree Large-flowered Magnolia (spp.)
Large-flowered Magnolia 'Alta®' Large-flowered Magnolia 'Altius™'
Large-flowered Magnolia 'Baby Doll' Large-flowered Magnolia 'Bracken's Brown Beauty'
Large-flowered Magnolia 'Claudia Wannamaker' Large-flowered Magnolia 'D.D. Blanchard'
Large-flowered Magnolia 'Dearing Street' Large-flowered Magnolia 'Edith Bogue'
Large-flowered Magnolia 'Exmouth' Large-flowered Magnolia 'Exonensis'
Large-flowered Magnolia 'Hasse' Large-flowered Magnolia 'Little Gem'
Large-flowered Magnolia 'Miss Chloe®' Large-flowered Magnolia 'Phyllis Barrow'
Large-flowered Magnolia 'Plantation' Large-flowered Magnolia 'Russet'
Large-flowered Magnolia 'Saint Mary' Large-flowered Magnolia 'Samuel Sommer'
Large-flowered Magnolia 'Satinleaf' Large-flowered Magnolia 'Select III'
Large-flowered Magnolia 'Symmes' Large-flowered Magnolia 'Victoria'
Larkspur, Canyon (spp.) Larkspur, Canyon 'Laurin'
Larkspur, Dwarf Larkspur, Orange (spp.)
Larkspur, Orange 'Laurin' Larkspur, Red (spp.)
Larkspur, Red 'Laurin'