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Our soil is a clay/loam type and I would like to amend with material to improve drainage for a new iris bed. Some have suggested amending with 'course sand', however, at the garden centers around here they seem to have only fine 'play sand' (not recommended) and they don't know anything about amending with 'course sand'. Others have amended with 'crushed gravel'. Is anyone familiar with exactly what that is or where to get it (if it is useful)? Others recommend a 'clay chemical additive' which seems very expensive. We have already added some compost. If you have added 'course sand' or some other amendments or additives to improve drainage for irises, please tell us about it and also what your recommended proportions are. Thanks. T.
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