re; Perlite substitute
Wed, 05 Jul 2006 23:31:22 PDT
If your local rock dealer has a fairly inert rock source and if you don't  
mind the added potting soil weight I find that 1/4 minus gravel gives excellent  
results.  It is cheap and if the fines bother you just run the gravel  
through a hardware cloth sieve.  Here in the rainy Portland Area I find  that a 
great mix for bulbs in pots is equal parts soil, the above gravel and  coarse peat.
Greig Warner
Vancouver, WA

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