Hartsease--Think of me.
Heliotrope--Devotion.
Henbane--Blemish.
Holly--Foresight.
Hollyhock--Fruitfulness.
Hollyhock, White--Female ambition.
Honeysuckle--Bond of Love.
Honeysuckle, Coral--The color of my fate.
Hyacinth--Jealousy.
Hyacinth, Blue--Constancy.
Hyacinth, Purple--Sorrow.
Hydrangea--Heartlessness.

Ice plant--Your looks freeze me.
Iris--Message.
Ivy--Friendship; matrimony.

Jessamine, Cape--Transient joy; ecstasy.
Jessamine, White--Amiability.
Jessamine, Yellow--Grace; elegance.
Jonquil--I desire a return of affection.
Juniper--Asylum; shelter.
Justitia--Perfection of loveliness.

Kalmia (Mountain Laurel)--Treachery.
Kannedia--Mental beauty.

Laburnum--Pensive beauty.
Lady's Slipper--Capricious beauty.
Larch--Boldness.