Re: Sand
The only thing I have to add is I have seen what clay soil can do to a corm when it cools down and stays wet (since clay is the soil that holds the most water of any). I mix in sand (I've even used the play sand for the mix), a bag of cow manure compost, and peat moss. I think anything is better than have straight clay, just use a non-floating mulch to hold it all in place :^)
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