I've got a house which apparently used to have a number of flower beds all around. We have a few flowers and decorative plants growing in them, but we also get a regular population of Walnut trees. I cannot pull them, so I've been pruning them back brutally. I know there is energy stored in the roots, because the darn things keep popping back up.
How many times should I expect to have to cut these things down (just above ground level) before they stay down? Is there a particular time of year that will work better?