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Main Index > Markets > Horticultural Applications > Perlite Plant Guides > Outdoor Gardening

Horticultural Perlite - The Natural Growing Media for Outdoor Gardening

When horticultural perlite is added to heavy clay soils, water ponding and surface crusting may be eliminated. In addition, plant roots may more easily penetrate the perlite/soil growing media and develop more fully. Horticultural perlite can be particularly advantageous in modifying the structure of general garden soil, patio plantings and roofscapes.

 

Advantages of Horticultural Perlite

  • Improves Aeration and drainage.
  • Makes moisture and nutrients readily available to plants.
  • Is organic and does not deteriorate.
  • Has essentially neutral pH of 6.5 to 7.5.
  • Serves as an insulator to reduce extreme soil temperature fluctuations.
  • Is sterile and free of weeds and disease.
  • Is clean, odorless, lightweight, and safe to handle.



General Garden Applications

Soil in vegetable and flower gardens can be conditioned by cultivating, with a fork or roto-tiller, to a depth of 6-12 inches (150-300 mm). A 4 inch (100mm) layer of a mixture of 1/2 horticultural perlite and 1/2 peat moss is worked into the cultivated soil. If the soil is rich in organic material, the peat moss may be eliminated. The same procedure may be followed in preparing lawn areas for sodding or seeding. Established lawns may also be renovated with horticultural perlite. The lawn area should be spiked or plugged and horticultural perlite spread on the surface and raked into the spike or plug holes. The perlite will work its way into the root zone to provide aeration and drainage.

If the garden area is very large, the home gardener may condition only the rows or areas where planting is to take place. Thus, if the procedure is continued for 2-3 years, the entire garden area will eventually be conditioned. Because horticultural perlite is inorganic, it will not deteriorate in the soil but will continue to function for many years.

Watering

Shrubs or trees should be planted in a mixture of 1/3 soil, 1/3 horticultural perlite, and 1/3 peat moss or compost. Following planting, the tree or shrub should be thoroughly watered.

When shrubs or trees are to be planted, a planting pocket 6 inches (150 mm) larger than the plant roots should be dug. A mixture of 1/3 soil, 1/3 horticultural perlite, and 1/3 peat moss or compost may be used to fill the hole and complete the planting operation. The shrub or tree should be thoroughly watered. The roots of the plant can easily penetrate and develop in the friable growing media.

Patio Planting

Horticultural perlite is an ideal material for patio planting in container boxes, tubs and ornamental containers. Because a perlite soil mix is light in weight, handling headaches are reduced as planters filled with a perlite soil mix may be easily moved to rearrange a patio planting display or to protect plants against adverse weather. A suggested soil mix for patio planters is 1/3 horticultural perlite, 1/3 peat moss, and 1/3 composted wood product such as bark or shavings. Patio plantings will require more frequent watering than garden plantings as they tend to dry out faster.

Lightweight horticultural perlite is an ideal material for patio plantings in container boxes, tubs, and ornamental containers.


Roofscape Gardening

For the apartment dweller with a limited outdoor roof garden, perlite can be of enormous benefit. The weight of planting mixes is very important when the strength of the supporting structure must be considered. Wet, sandy loam weighs from about 120-140 lbs/cu.ft (1920-2240 kg/cu.meter) while a soil mix consisting of equal parts of perlite and peat moss weighs only about 25 lbs/cu.ft (560 kg/cu.meter) when wet. As a result, a perlite growing mix can be several times as deep as a conventional soil mix without increasing weight. This enables the rooftop gardener to grow larger trees, shrubs and plants and to have more extensive gardens.

Information given herein is from sources considered reliable, but no guarantee of accuracy can be made or liability assumed.  Your supplier may be able to provide you with more precise data.  Certain compositions or processes involving perlite may be the subject of patents.
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