| Term | Definition |
|---|---|
| Halfhardy | Refers to plants that can withstand long periods of damp or cold weather but may be damaged by frost.
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| Harden Off | The process of?gradually?acclimatizing greenhouse or indoor grown plants in stages to different temperatures or to outdoor growing conditions.
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| Hardiness | The ability of a plant to withstand low temperatures or frost, without artificial protection.
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| Hardpan | The impervious layer of soil or clay lying beneath the topsoil.
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| Hardscape | Constructed elements of a landscape, such as decks, walls fences and driveways.
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| Hardy | Refers to plants that have the ability to survive prolonged exposure to freezing temperatures.
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| Heading Back | Cutting an older branch or stem back to a stub or twig.
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| Heat Island Effect | A documented phenomenon that takes place in urban and suburban areas where temperatures are as much as 10 degrees Fahrenheit (6 degrees Celsius) hotter than in rural areas.
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| Heel In | A method of protecting a plant by placing its stems in a shallow trench over winter.
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| Heeling In | Temporarily setting a plant into a shallow trench and covering the roots with soil to provide protection until it is ready to be permanently planted.
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| Heirloom Seeds | Seeds that have traditionally been saved by families, generation after generation. These seeds have many qualities and are desirable for their high qualitly and taste.
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| Herbaceous | Describes a plant with soft rather than woody tissues.
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| Herbicide | A pesticide formulated to kill or control plants.
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| Honeydew | The sticky secretion produced by sucking insects such as aphids.
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| Hoop Stake | A long, thin, metal post with a perpendicular ring of wire at the top, which serves as a support for tall-growing flowers.
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