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Potatoes/was wall of tires

There was a question why one would want to rotate a potato crop.  The main
reason is that potatoes, and tomatoes for that matter, are subject to a
variety of soil-borne disease such as blight.  By rotating the crop (not
coming back to the same spot until 4 years have passed) allows those disease
organisms to die (I think).  Potatoes and tomatoes shouldn't be planted next
to each other, or tomatoes planted where the potatoes were last year (and
vice-versa)for that reason.  Makes for an interesting time if one has a
small garden and wants both vegetables.  Plants of the same family (e.g.
cole crops - broccoli, cabbage, cauliflower, Brussel sprouts) often get the
same diseases, and one should rotate those crops as well.  

Sally
spwolff@whidbey.net
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