Common names: J
- Jack pine
- jack tree
- jackfruit
- Jacob's ladder
- Jacobite rose
- jade plant
- jade vine
- jakfruit
- Jamaica sorrel
- Japanese alpine cherry
- Japanese anemone
- Japanese angelica tree
- Japanese apricot
- Japanese aralia
- Japanese astilbe
- Japanese azalea
- Japanese barberry
- Japanese beautyberry
- Japanese black pine
- Japanese blood grass
- Japanese boxwood
- Japanese burnet
- Japanese butterbur
- Japanese camellia
- Japanese candelabra primrose
- Japanese cedar
- Japanese cheesewood
- Japanese cherry
- Japanese cornelian cherry
- Japanese creeper
- Japanese dogwood
- Japanese dwarf birch
- Japanese emperor oak
- Japanese fantail willow
- Japanese fibre banana
- Japanese flowering crab apple
- Japanese forest grass
- Japanese gentian
- Japanese hackberry
- Japanese hazel
- Japanese hibiscus
- Japanese holly
- Japanese honey locust
- Japanese honeysuckle
- Japanese horse chestnut
- Japanese iris
- Japanese Jack-in-the-pulpit
- Japanese knotweed
- Japanese lace fern
- Japanese larch
- Japanese mahonia
- Japanese maple
- Japanese mock orange
- Japanese mock-orange
- Japanese monkshood
- Japanese nutmeg-yew
- Japanese orange cherry
- Japanese pagoda tree
- Japanese painted fern
- Japanese parsley
- Japanese pieris
- Japanese plum
- Japanese plum yew
- Japanese primrose
- Japanese privet
- Japanese quince
- Japanese red pine
- Japanese rose
- Japanese rowan
- Japanese rush
- Japanese sedge
- Japanese silverberry
- Japanese skimmia
- Japanese snowball
- Japanese spikenard
- Japanese spindle tree
- Japanese spiraea
- Japanese spurge
- Japanese stewartia
- Japanese sweet flag
- Japanese sweet shrub
- Japanese toad lily
- Japanese walnut
- Japanese white birch
- Japanese white pine
- Japanese wisteria
- Japanese witch hazel
- Japanese wood poppy
- Japanese yew
- Japanese zelkova
- jasmine
- jasmine nightshade
- Java ginger
- Java palm
- Javan water dropwort
- Jerusalem artichoke
- Jerusalem cross
- Jerusalem sage
- Jezo spruce
- jiaogulan
- Jimson weed
- Joe-Pye weed
- Joey palm
- Joseph's coat amaranth
- jostaberry
- Judas tree
- Judean sage
- jujube
- jumpseed
- juniper
- juniper-leaf grevillea
- Juno iris
- Jupiter's beard