hi, i have some invasive tree/shrubs on my property. they are approx 12 ft tall, grow in clumps, and send out shoots from long roots. they are very thin and leggy. no one can seem to identify them. i'd like to remove them (the shoots are approaching my house), but don't know what i'm dealing with. they are also on my neighbor's property, and i don't want to kill theirs in the process as they seem ok with them. thanks!