I am not sure how well rockwool will work out, not sure why though. If you were going to put them in cold storage to make your own bare root plants, it would be easier to clean off the Perlite for storage (bare root). You wont be able to clean off the rock wool, however as long as it's only slightly moist when in cold storage, there may be no problems using it at all. When I ordered them they had no soil at all on the roots, but just packed in slightly moist sawdust with all the leaves removed, just the crown and root-ball.
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