'Iron Butterfly' Foamflower: Tiarella 'Iron Butterfly' Narrow Leaf Ironweed
Iron Cross Begonia Iron Fern
Ironweed, Narrow Leaf 'Iron Butterfly' Ironweed, New York
'Irvine Currant' Florist's Chrysanthemum 'Irvine Dark Bronze' Florist's Chrysanthemum
'Irvine Pink' Florist's Chrysanthemum 'Irvine Red' Florist's Chrysanthemum
'Irvine Regal' Florist's Chrysanthemum 'Irvine Yellow' Florist's Chrysanthemum
'Isabelle Pring' Waterlily Island Alumroot
'Island Brocade' Broadleaf Sedge 'Island Charm' Hosta
'Island Delight' Daylily Island Sagebrush
Isoplexis Isotome, Rock
Italian Arum (spp.) Italian Arum 'Pictum'
Ivory Pineapple (spp.) Ivory Pineapple Variegated
Ivy Geranium (spp.) Ivy Geranium 'Colorcade Lavender'
Ivy Geranium 'Sunset' Ivy Leaf Morning Glory 'Roman Candy'
Ivy, Grape (spp.) Ivy, Grape 'Ellen Danica'
Ivy, Grape 'Mandaiana' Ivy, Ground (spp.)
Ivy, Ground Variegated Ivy, Mexican (spp.)
Ivy, Oak Leaf (spp.) Ivy, Oak Leaf 'Ellen Danica'
Ivy, Oak Leaf 'Mandaiana' Ivy, Swedish (spp.)
Ivy, Swedish 'Silver Shield' Ivy: ciliatus, Swedish (spp.)
Ivy: forsteri, Swedish 'Green on Green' Ivy: forsteri, Swedish 'Marginatus'
Ivy: Plectranthus , Swedish 'Lois Woodhull' Ivy: Plectranthus , Swedish 'Nicodemus'
Ivy: Plectranthus , Swedish 'Nicolleta' Ivy: Plectranthus , Swedish 'Old Gold'
Ivy: Plectranthus , Swedish 'Zulu Wonder' Jaburan Lilyturf
'Jack Catlin' Aeonium 'Jack Frost' Siberian Bugloss
Jack in the Pulpit, Japanese Jack in the Pulpit: ringens
Jack in the Pulpit: triphyllum 'Jack Spratt' Flax
Jackal's Tail Aloe Jackman Clematis (spp.)
Jackman Clematis 'Purpurea Superba' 'Jackmanii' Clematis: (n)
'Jackpot' Tanacetum 'Jacob Cline' Bee Balm: didyma
Jacobean Lily 'Superba' Jacob's Ladder 'Purple Rain'
Jacob's Ladder, Creeping Jacob's Ladder, Northern 'Heavenly Habit'
Jacob's Rod (spp.) 'Jacqueline' Crimson Flag
'Jacqueline' Dwarf Astilbe 'Jacqueline' Florist's Chrysanthemum
'Jade Frost' Flat Sea Holly 'Jade Gloss' Alumroot: Heuchera
Jade Magic Jade Plant Variegated
Jade Plant, Silver Jade Tree Variegated
Jade, Chinese 'Jaguar 3' Tall Fescue
'Jambalaya' Daylily Jamberry
'Jamboree Blue' Garden Petunia 'Jamboree Blue Vein' Garden Petunia
'Jamboree Burgundy' Garden Petunia 'Jamboree Hot Pink' Garden Petunia
'Jamboree Lavender II' Garden Petunia 'Jamboree Light Blue' Garden Petunia
'Jamboree Plum Vein' Garden Petunia 'James Brydon' Waterlily
'James Gurney' Waterlily 'James' Plectranthus
Jamestown Weed 'Jan Bos' Dutch Hyacinth
'Janelle' Allamanda 'Janet' Hosta
'Janice Brown' Daylily