'Luna' Witchhazel: intermediahybrid 'Luscious® Citrus Blend' Lantana
'Luscious® Grape' Lantana 'Luscious® Lemonade' Lantana
Lusterleaf Holly 'Lutea' American Arborvitae
'Lutea' Monterey Cypress 'Lutea Zebrina' American Arborvitae
Lychee (spp.) Lychee 'Brewster'
Lydia Broom (spp.) Lydia Woodwaxen (spp.)
'Lynwood Gold' Border Forsythia: intermediahybrid Lyonia
Lyonia, Fetterbush Lysiloma
Maackia, Amur Maackia: amurensis, Amur
Maak's Honeysuckle Macadamia 'Dr. Beaumont'
Macarthur Palm Macedonian Pine
'Machino' Japanese Maple 'Macho' Amur Corktree
Macho, Ocotillo 'Macopin' Eastern White Pine
Macquarie Pine 'Macrantha' Royal Purple Brunfelsia
Macranthum Azalea (spp.) Macranthum Azalea 'Kate Arendall'
'Macrophylla' Canadian Hemlock 'Macrostachya' Common Lilac
'Maculatum' Norway Maple Madagascar Dragon Tree
Madagascar Jasmine Madagascar Olive
'Madame Briot' English Holly 'Madame Emile Mouillere' Bigleaf Hydrangea
'Madame GJ Bier' Bigleaf Hydrangea 'Madonna' Black Elderberry
Madrone Madrone, Pacific
Madrone, Texas Madwort: spinosum
Magellan Barberry Dwarf 'Magenta Red' Crapemyrtle
'Maggie Brown' Azalea 'Magic Berry' Snowberry
'Magic Carpet' Japanese Spirea Magic Flower
Magic Flower of the Incas 'Magician' Rose Deutzia