I feel for you! We have bad neighbors on all sides of us, luckily there is some space (we're in the boonies, but you still get bad neighbors who burn plastic and let it smolder all day and the wind blows the stench into your house). I planted A LOT of bamboo, mostly to hide the ugly view of the one neighbors property that we can see in winter (and see all the garbage they have piled everywhere, along with the 30 dogs he has (he runs a puppymill, and do the authorities care? NO.). Destruction of property is a bad thing. Maybe you can get some form of mediation involved? I think that is cheaper than a lawyer. Sorry to hear about your neighbors, ours are really bad. One we have property bordering with tries to steal our land by putting up goat fencing on our side, he's built tree stands (with boards and lots of nails)in our real nice oak trees, their one son was in it and when my husband went up to the kid, he pointed a bb gun at him! The little jerk never even apologized (neither did his parents, no surprise), the kid started ARGUING with my DH about where the property line is (Sorry, but my DH knows how to read a topo map, as well as survey maps too, and WE know where the line is). Of course we called the police on these jerks, after all the other stuff they've done, it was time.

"I like to believe that each person can decide for themselves whether or not a plant in a given situation is threatened to a point that it would be more beneficial to move it than to leave it where it stands, whether it is in a park or on a roadside or any public property. " A roadside is not punblic property. I think it would be of interest that in many cases when only a single individual of a plant species exists that plant is left as undisturbed as possible and is propegated instead of moved, because even then moving the plant is not more beneficial (indeed, probably worse) to leavin it. Those singular individual plants in question are not, however ignored. By looking at that example, NO plant is 'threatened to a point that it would be more beneficial to move it than to leave it where it stands' unless imminent destruction in the near future is likely due to human activites. Therefore in almost any surcumstances leaving the plants is definatly the better option, but some site care such as checking and removing all weeds in the vicinity of the plants is vastly better than moving them. Also, if you cant do that site maitence (for example, not on your land)your probably not supposed to be moving plants from there anyway. Unless you have premission of course, preferably permission to maintain the site. A roadside planting is most likely secure, and with the wildflowers and garlic mustard, perirodic weeding in the imidiate vicinity of the plant population may be all that is required for the long-term presistance of that population. It is interesting to note that in certain curcumstances (for example, native wild plants transplanted to a neatly kept garden) the population of transplanted plants are unlikely to survive in the long-term because they may not reproduce. While the individual transplanted plants may survive, the establishment and long-term presistance of a self-supporting population in in doubt, altough it can and does happen, it might just as easily not because of many subtle variables affecting the growing site means establishment of said transplanted plants might be in unlikely. Without long-term presistance of a self-supporting population, it, in my mind atleast, not a resce in the sence that these plants have been removed from a population that probably needs all the individuals it it can get, and presistance in the wild is far more important, ecologicly speaking, than presistance in cultivation. Note: the terms Establishment and self-supporting population does not just mean that the species sometimes reseeds itself, altough that is a important factor in the process. In the case of this garlic mustard weeding within the viicinity of the plants on a regular basis would probably ensure theri survival in the short term, altough their long-term survival may be in doubt because, lets face it, you wont be there forever to weed. WHat might work is if you suceed in reducing garlic mustards population density in the area.

There are words to describe it because I just read them. I figured since you have now sounded the alarm twice on this "monster" I got curious about it. It is listed as an invasive species, however doesn't seem to be a threat in Oklahoma, as it is in California although it does grow here (and most other states). Since it is an annual, it is not certainly public enemy #1 by a long way. Ragweed makes this one look like a piker. The information suggests mowing and grazing will control it. I've definitely seen worse offenders. Pat, if you see one, just calm down, pull it or cut off its head so it can't bloom.

I think cardboard and or newspaper, then peastraw, then bark mulch like pine it naturally suppresses weeds, also this mainly suppresses the old weeds, some will naturally pop up in the mulch as it breaks down from any seeds or new running weeds from lawns or fence lines etc. I'm creating a brand new cutting flower bed in our orchard, trying to spray the woody weeds (different ones here in our country) and then a general spray possibly a few times a few weeks apart, then layering cardboard on the stubborn areas, thick newspaper on the others, then using some cut up branches from tree pruning, then peastraw, then compost, then rinsed off fresh kelp seaweed from our local beach, then bark mulch, leave it to break down over our mostly wet winter here. Then come spring after the last frost I'll begin planting out seedling started in trays. I'll have to maintain the weeding as we get a lot of wind, may try spot treatment dab on weed killers but see how we go. Because of our compacted clay soil the lasagne gardening style seems to work well. One think I found was running weeds tried to creep into the mulch so wil try to cut out large gutters and weed spray these. Then mostly I just dig blood and bone into the planting holes. Using leaf mulch around plant bases can work too. Lots of different methods I think it can depend on what you need. I found the weed suppressant mat wasn't permeable enough for water, in a heavy rain the mulch washed off areas since the water wasn't absorbed fast enough into the soil, and then weeds actually grew on top of it anyway from seed so a waste of money in my opinion. Try libraries for newspaper, and maybe a big white ware or electronics store for cardboard.