What to use instead of perlite or vermiculite?

Lil24790049
by Lil24790049



  1 answer
  • Lynn Sorrell Lynn Sorrell on May 25, 2019

    What are you using it for??? they serve totally different purposes---Not knowing the difference could ruin your project.

    Both vermiculite and perlite are inorganic products, both are relatively sterile, and both are often used as soil additives. Vermiculite is a soft,spongy material made from super-heating mica. Perlite is a hard, highly porous material made by super-heating volcanic glass. Typically, vermiculite will be tan/brown in color and perlite will be white. Whereas vermiculite absorbs water in its plate-like structure, perlite traps water in its very porous, undulated structure. Vermiculite is close to a neutral pH whereas perlite has a slightly more alkaline pH. Both are very light-weight.

    Though both products do in fact aerate the potting soil, the fact that vermiculite holds moisture longer than perlite makes their usage different.

    Vermiculite retains more water and retains it for longer periods than perlite. Vermiculite affords slightly less aeration than perlite. For plants that thrive growing in a more-wet soil, vermiculite would do well as a potting soil additive. Many plants are more sensitive to alkaline conditions, so in that case, vermiculite would be a better choice than perlite. Since many foliage plants appreciate more water-retentive potting soil, they do well in a vermiculite-added potting soil. Also, simply because of its water retention/nutrient retention, vermiculite makes a good seed-starter medium.

    Perlite only traps water on its large surface area, consisting of nooks and crevices, and thus releases its water more quickly. In doing so, it can help raise the humidity around plants. While vermiculite would be a better choice for starting seeds, perlite would be a better choice when rooting cuttings. Cuttings would tend to rot more easily in vermiculite. For plants that need a quickly draining soil, a soil that does not retain much moisture, a soil that is extremely well aerated, and a soil that could have a higher pH, perlite would be the best additive. Cacti and non-cacti succulents would be such plants. Also, because most epiphytes like to have their roots dry out quickly between watering and also appreciate higher humidity, perlite would be the best choice.

    Thus, although vermiculite and perlite have some similar properties, they are not the same. When plants need more water-retentive soil or for seed-starting, use vermiculite. For plants that prefer quick-drying soil or for starting cuttings, use perlite.

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    • Lynn Sorrell Lynn Sorrell on May 25, 2019

      Peat (also known as peat moss) is light and holds moisture well but not does not stay soggy. It also allows air to flow through the soil. Peat takes hundreds of years to form and is harvested from bogs. According to Oregon State University, some wetland ecologists are concerned that it is being harvested at a non-sustainable rate.Coir is coconut dust. It is made from the short fibers that are left over after harvesting the husk for other uses, such as rope and brushes. Coir holds water well and can stay moist longer than peat. It also decomposes more slowly and therefore will not need replenishing as quickly.Sawdust from untreated old wood works well as a vermiculite substitute. It loosens the soil and also holds moisture well. Use sawdust that has been out in the weather for at least two to three months or else you will have to add nitrogen (such a urea) at the same time you add the sawdust.The new sawdust will pull the nitrogen out of soil depleting it from soil & plant use.