I have a rather large perennial garden fairly close to a purple loosestrife marsh, and constantly have to battle the loosestrife to keep it out of my garden. (I have almost totally given up on the marsh.) When I first started the garden, I threw out all the tall weeds I could easily uproot, then rototilled the weedy ground well before planting. I can attest that the loosestrife grew back from every small piece of rootstock that was broken up by the tiller. It was a mess! Also, seedlings keep coming up that have blown in from the marsh. These seeds are extremely tiny and easily blown by the wind. One good thing I have learned, however. Loosestrife will not grow in dense shade, and a barrier of dense shrubs and trees will slow its spread. I am contemplating planting various swamp trees in my marsh to hopefully kill it there by shade. Obviously this is a long term project, and the trees will have to be well protected or they will be killed off before being large enough to have any effect. I have no confidence that the Galerucella beetles will make much of a dent in the huge stands of purple loosestrife that we now have. Ted Fischer Dexter, Michigan USA