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I have been told by my conservation agent that mimosa trees have very invasive roots.
I planted one in a field, and watered it regularly but I had trouble with winter die back. Every year a lot of it would die and grow back, turned out to not be shaped very nice this way. I had it for like 5 years, and finally cut it. But they might do better in a warmer climate.
It is humid here in the summer. But not that much rain. We get rain mostly in the spring and fall. I would think that in dry climates, it would root even more in order to find water. I have been told that trees that get water regularly tend to root shallow as they do not have to root far to get water.
I don't know if that is true though, and I am sure would vary depending on the type of tree.
I have heard of willows rooting into water pipes and great distances to reach water.
