September 16, 2012
It may be a Ailanthus (tree of heaven) or black walnut. These are rather invasive weed trees that look like sumac.
If you are finding that when you cut them back that they just regrow, try painting the fresh cuts with Roundup. The tree will suck the Roundup into the root system through the cut and this will kill the roots.
Once you have the more mature plants handled, the best way to handle them in the future is to become diligent about removing the seedlings as you find them.
The seedlings must be coming from a nearby plant (hopefully one in your yard). If possible, see if you can remove the source of the seeds or at least reduce how many seeds fall into your yard. If it is in a neighbor's yard, you can ask if they can at least prune any branches that hang over into your yard to help reduce how many seeds fall into your yard.
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