Heat loss

heat loss The net temperature decrease in an area or material.

heat transfer The flow or exchange of heat between gases, solids, or liquids, through conduction, convection, or radiation.

heave The upward lifting of soil caused by expansion due to frost, moisture absorption, etc.

heaving The lifting of plants, rocks, or structures in soils (esp. some clays) from the actions of freezing and thawing.

heavy soil Any soil with a significant amount of clay, making it more difficult to work, more sticky, and slower to warm in the spring. They are not necessarily heavier than other soils.

hectare A metric measurement of area comprised of 10,000 sq ms. One hectare is approximately 2Vi ac.

hectometer (hm) A metric measurement of 100 ms or 328.08 ft.

hedge A row or line formed by shrubs, bushes, small trees, or any kind of plant being planted closely together, forming physically or visually a boundary, fence, decorative line, or barrier. They are often pruned to a symmetrical shape that is flat or cube shaped, etc., forming a natural-looking wall.

hedgerow A tall row of vegetation that separates lower vegetation or open lands, configured in a line and usually on a boundary (not necessarily straight) of fairly constant width such as between fields or along ditches. In landscape ecology, they include fencerows, shelter-belts, hedges, windbreaks, and plants along many water corridors. They are sometimes planted for wind and water erosion protection in agricultural areas, but are more often found along roads or fields seeded by wind, water, birds, etc.

-hedral A Greek suffix, often used in botanical terms to describe something relating to a surface.

heeling-in A method for storing bare root plants temporarily by burying or covering their roots with moist material such as sawdust or soil to prevent them from drying out.

heirloom garden A landscape designed and installed with plant material used in a particular area at a particular period of time in the past. These gardens have a historical style of planting design and materials.

helistop An area to be used for the landing, takeoff, or parking of a helicopter.

hemi- The Greek prefix meaning half, sometimes used in botanical descriptions.

herb 1. An annual, biennial, or perennial that produces seed and does not develop woody tissue. Herbs die at least back to the ground at the end of a growing season. 2. An annual, biennial, or perennial that has culinary value and is prized for use in cooking.

herbaceous 1. Having the characteristics of an herb with little or no woody tissue and lacking a persistent live stem aboveground. 2. Plants that die to the ground and grow a new stem each year.

herbaceous stem
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