need ID on thorny plant
Bought a house last year w/ a perennial garden that's gone a bit wild. There's a big patch of shrubby plants that I think are weeds--I've taken a lot of them out (w/ great difficulty, as they're very stubborn)--but I can't seem to find out what they are. Here's the stats:
Upright growth, w/ arching habit
Most growth is on main stem--not a lot of branching--but new stalks do come up from the base.
Many, many thorns on the stems. Thin; not like roses
Gets about 3-4 ft tall (would be taller but for the arching)
3 leaves, in clusters, serrated edges
They look a lot like my raspberries, but don't seem to do anything. No fruit. Haven't seen any flowers, except 1 small white 5-petaled flower on a short stalk DH pulled up last wkend. Not 100% sure that's the same thing. The raspberries are also straighter in their growth. Raspberry patch is several dozen feet away from the perennial bed.
The property is in the hills outside Scranton-WB, NE PA.
Any ideas would be most appreciated. Thanks!