Specialty Gardening: Container Soils - Water Movement and Retention III , 1 by tapla

tapla wrote:
'Fines' is an adjective, so if you only look for something with 'fines' on the bag, you might by-pass a lot of good material before you find what you need. I use the word 'fines' so you don't get big nuggets. If you know what Sugar-Pops cereal is, I'd say you want bark that has particles from dust size to not much larger than Sugar Pops for the 5:1:1 mix. For the gritty mix, use screened bark from 1/8-3/8 or so in size.

The bark at 3,6,9 o'clock are good for the 5:1:1 mix .... or for the gritty mix if you screen it. What I use for the gritty mix is the pre-screened white fir bark at 12.

Al