Silica Desiccant
This product is available through major horticulture distributers as it is used when transplanting huge trees to ensure water retention. I checked into it last year and it was really quite cheap. I don't recall the name of the company that I talked to but I got the name from garden works if that helps. I can also inquire with our gardener at work who does a lot of major tree replacement in North Van. (Lot of bark eating tree huggers here), if you're interested.
Lynn
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