As a soil amendment, Perlite (heat-expanded siliceous volcanic rock) is used to improve aeration and drainage. Its moisture and nutrient retention capabilities and lightweight characteristics make it an excellent sterile medium for starting seeds and rooting cuttings. Perlite does not degrade over time, which makes it a long-term solution to many gardening problems.
Mother Earth Perlite is naturally occurring siliceous rock that when heated to 1600 F expands up to 20 times its original volume. This kilning process is very similar to popping popcorn and produces a growing medium that is sterile and has a neutral pH of 7.0. The exceptional physical properties of this giant perlite make it tops in the perlite world for adding porosity to soil and soilless mixes. This giant also has numerous hydroponic applications as well. The #4 averages a whopping size of around 1" and the #3 measures around 1/2".
FoxFarm Big and Chunky Perlite is the perfect medium for blending into containers and raised beds for increased drainage aeration. The oversized chunks help distribute water and air evenly so roots can thrive. It's also great in hydroponic solutions.