Half-hardy annual

An annual, or a plant commonly treated as an annual, which cannot be grown in the open before the warm season of the year; usually raised from seed under glass for summer display in the open

Harden off

Gradually to accustom to more rigorous conditions seedlings or other plants which have been growing in a protected environment

Hardy

Able to thrive in a given climate all the year round without special protection

Heath plant

A heather, or plant suitable for growing in the same dry and sandy conditions as heather

Heel

A portion of older tissue at the base of a young shoot torn or cut from its parent

Herb

A flowering plant of which the stem does not become woody and which generally dies to the ground at the end of the season

Hermaphrodite

Bisexual, hearing both male and female organs in the same flower

High or Top worked

Grafted or budded at the point of the future crotch of standard or half standard tree