I am making my own bonsai mix diatoms earth , fir bark and some perlite ..was wondering if it's on if my fir bark pieces are bigger and if this will effect anything. I can't find any smaller
Looks like you're using bark marked for orchid use. Most local places I've seen only carry medium to large sized bark. If it bugs you and you want to take the trouble, you can get a local "nursery mix" that is a mix of composted bark and peat that you can sift the fines out of. However the guys who answered you above are more experienced than I and If they say it will work as is then there ya go.