Turfgrass Management Terms H

Hard edge - a defined border in a lawn. It is usually accomplished by digging a shallow trench along the grass edge

Harden off - the natural process that occurs when plants gradually acclimate to cooler temperatures. Indoor-grown seedlings are set outside for short periods in spring to harden off before being transplanted to the garden. Hardy outdoor plants naturally harden off as winter approaches. Anything that inhibits the process can jeopardize a plant's ability to tolerate cold

Hardiness - plant's natural ability to withstand temperature extremes, especially winter lows, without added protection. Hardiness zones are geographic areas classified by temperature and climate data. Hardiness ratings, shown on plant nursery care tags, provide a range of upper and lower zones that show where the plant normally survives from year to year. 

Hardscape - the nonliving features of a landscape, such as paved areas, concrete and stones. It does not include living, “softscape” features such as lawn grasses and garden plants

Heat Index (HI) – the temperature the body feels when heat and humidity are combined. Exposure to direct sunlight can increase the HI by up to 15°F

Heaving - swelling or rising of the surface caused by the freezing and thawing of soil

Herbaceous - non-woody plants

Herbicide - chemical used to kill weeds or herbaceous growth

Hirsute - with straight rather stiff hairs

Hispid - with rather long stiff hairs

Humus - soft, brown-black well-decomposed material that forms during the final stages of decomposition of animal and plant matter. Humus adds beneficial bacteria to turfgrass soil, encouraging strong growth

Hyaline - colorless and translucent

Hybrid - offspring plant that results from crossbreeding two plants of different varieties, species or genera 

Hydromulching - uses water, mulch, and a substance to help it stick in a slurry to stabilize soil and limit further erosion

Hyrdoseeding - technique for applying seed, mulch, and fertilizer in a water slurry over a seedbed. Spraying water-based mixtures is an efficient way to help establish grass or prevent erosion. It can be used on yards, but is more often used on slopes. The method is generally less expensive than sod but more expensive than seeding


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