It really depends on the variety because some are winter hardy to Zone 8 and possibly even 7b given the right conditions. Given the fact they are growing wild along the river, and if you see them year after year, it is probably likely that they will survive your winter conditions, but nothing is a guarantee because of the variables that come with transplanting and moving to a new growing area.
You also want to be careful about digging up plants on property that does not belong to you. If the river is not located on your property, the best thing to do is to contact the landowner or the state/county/town to get permission before taking any plants.
Hi Amanda,
It really depends on the variety because some are winter hardy to Zone 8 and possibly even 7b given the right conditions. Given the fact they are growing wild along the river, and if you see them year after year, it is probably likely that they will survive your winter conditions, but nothing is a guarantee because of the variables that come with transplanting and moving to a new growing area.
You also want to be careful about digging up plants on property that does not belong to you. If the river is not located on your property, the best thing to do is to contact the landowner or the state/county/town to get permission before taking any plants.