Pumice: Pumice is a volcanic rock that is similar to lava rock in its properties. It is lightweight, porous, and helps to aerate the soil and improve drainage. However, it is less dense than lava rock, which can make it more difficult to work with.
Perlite: Perlite is a volcanic glass that is heated to expand it into small, white, popcorn-like pieces. It is very lightweight and porous, making it a good choice for lightening up heavy soil mixes. It also helps to improve drainage and aeration.
Vermiculite: Vermiculite is a mineral that is heated to expand it into brown or gold, mica-like flakes. It is lightweight and absorbent, making it a good choice for retaining moisture and nutrients in soil mixes. It also helps to improve aeration.
Horticultural charcoal: Horticultural charcoal is made from the burning of wood or other plant materials. It is lightweight and porous, making it a good choice for lightening up heavy soil mixes. It also helps to improve drainage and aeration.
