Expanded shale is formed when the shale is crushed and fired in a rotary kiln at 2,000 F. … Expanded shale also holds 40% of its weight in water, allowing for better water retention around plants. Unlike organic amendments, expanded shale doesn’t break down so soil stays loose and friable for years.

What is expanded shale aggregate?

ESCS is a ceramic material produced by expanding and vitrifying select shales, clays, and slates in a rotary kiln. The process produces a high quality ceramic aggregate that is structurally strong, durable, environmentally inert, low in density and highly insulative.

Is perlite expanded shale?

Expanded shale is a clay material that, like perlite, expands when it is heated to approximately 2,000 degrees. … I used to use perlite before shale came along, but it floats to the tops of the pots. Fine tunings and feedings… One other place where I will adjust my potting soil mix: hanging baskets.