Expanded perlite is available in two particle sizes: fine (1–3 mm) and medium (3–6 mm), both in 60 L bags. Both share the same origin and general behavior, but the difference in particle size changes their agronomic function: the fine grade improves aeration without significantly altering the texture of the base substrate; the medium grade drains more aggressively and creates macropores in the root ball. This comparison guide helps you decide which one to blend with your substrate.
Comparative | Expanded perlite: how to choose the right variant
