I took down the tree becuause I was concerned the sizeable root system might break an underground water or gas main, but I'm not that keen on removing the stump. Can I just leave it in the ground without worrying that the roots will continue to grow?
No, the roots will not keep growing. Roots only spread and grow to keep up with the top growth of the tree. Since there is no more tree, they will die off and rot over time. Pine trees do not produce suckers from their root system, so there's no need to worry about a new tree sprouting up in a couple yrs. The only thing you will more than likely have is, a problem with mushrooms popping up around the root zone area during wet, winter weather. The "mycilium" feed on the decaying roots and send out "fruiting" body's, which are the mushrooms seen on the surface of lawns and bed areas. As soon as the roots rot away, which may take a few years, the mushrooms will stop forming. Pine trees will "always" stop growing when they are cut down...Hope this answers your question.
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