Posted: 01/09/2012 at 10:03
I would suggest rotating tomato crops to other areas, as this minimises the risk of blight being contracted, i have seen varied views that blight can remain in the soil from 2-3 up to 6 years, this would also be the same for potato`s as they are often attacked by the blight contracted by tomato`s. i normally rotate on a 4/5 year cycle, starting with toms then a root veg (beetroot or carrots), then onions & leaks and then either salad or brassicas, and finally restart the cycle again (making sure to replenish as much nutrients as possible after each successfull crop.)