I was told that for really "hot" horseradish, you should harvest in either spring or fall. I can't remember which one. Maybe it really doesn't matter?
Hardiness Zone: 5b
By Jane from Spartansburg, PA
Why don't you do both; if it's not hot enough the first time [that would be upcoming spring, right?] offer it to friends and family who like milder horseradish.
Being fresh, I am going to guess it will be plenty hot, regardless.
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