This has been an interesting thread. There are a few wild lots near my house, and in the last few years the trees of heaven have taken over. They're crowding out the sumac, which I would much rather see (and smell!) How come TOH are ineffective at crowding out poison ivy?
I'd really like to do something about them. I just searched around to see if that copper-nail thing I'd heard of really works (no, it doesn't) and I read an interesting article about the difficulty in eradicating them--I guess I'll have to use scary chemicals! The hack-and-squirt way seems pretty good. The article I read was: (broken link removed to http://www.nps.gov/plants/alien/fact/aial1.htm)
According to this site: (broken link removed) :
"Tree-of-heaven wood resembles ash (Fraxinus spp.) wood in appearance and quality. It is easily worked with tools and glue, and takes a finish well. Tree-of-heaven wood properties are summarized in Alden [2] and Moslemi and Bhagwat [117]. Berchem and others [11] and Adamik and Brauns [1] provide information on properties and potential uses of tree-of-heaven wood fiber. Zasada and Little [176] provide information on tree-of-heaven cultivation.
Tree-of-heaven is an important timber and fuelwood tree in China, and is planted for timber and afforestation in New Zealand, the Middle East, eastern Europe, and South America [8,74,144,163,176].
Other products: In China, tree-of-heaven is grown commercially as a host for Attacus cynthia, a silkworm that produces coarse, durable silk [74,165]. Tree-of-heaven is a food for honey bees worldwide. Initially bad-tasting, tree-of-heaven honey ages to a high-quality, flavorful product [29,112]."
I'm wondering if my county extension will hook me up with a few ounces of scary chemical. That would be nice!