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How invasive are globe willows? Also, what is the distance they should be from the septic system and water lines, etc?
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They are not invasive at all in terms of weediness, since they are male clones that produce no seed. I imagine they sprout from their roots so they could be a little weedy near the parent tree.
I wouldn't plant a willow of any kind other than a shrub, since they grow too fast and are weak wooded and insect and disease-prone. If you have a septic system they should be as far as possible from it (50 feet or more). Water lines, etc. aren't much of a worry.
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