If you have access to fir bark, which is 'chunkier' than pine bark, use 1/8-1/4" if you can. If you're using pine bark, which is flatter than fir bark, use what passes through 3/8 but not 1/8".

It's better to have the pieces a little larger than idea than smaller; 'too small' negates one of the main advantages the gritty mix is designed to offer - no perched water table.

AL

Thanks for the reply... I get it now. One more nit picky question.... do I have to sieve Grani Grit grower or just rinse the dust off?

I'm very excited to try this stuff on my kiwi vine. Growing kiwi in containers is a bit of a stretch to begin with. That's why I chose the least vigorous variety.

Gran-I-Grit is prescreened, but it's best if you give it a quick screen or rinse to rid it of the dust. Good luck!

AL