Coarse, medium or fine – different types of substrates

Loose substrates can be divided roughly into three different types according to fraction size or grade: coarse, medium coarse and fine.

Fine fraction substrates

The growing media has a small particle size which is optimal for use in plant propagation in trays.

 

Medium fraction substrates

The substrate has some larger particles and maybe used in medium sized pots. The larger particles provide some structure to the growing media needed for the medium sized pots.

Coarse fraction substrates

The mix has some much bigger particles for use in big pots and containers. The larger containers require a coarse substrate with the very big particles which provide the necessary structure for the mix.