I have two of these planted in front of my house. Probably stand no more than 4 feet tall. We planted them two years ago. I think I planted them too close to the railing, and I was wondering if anyone can tell me how extensive the root system would be at this point.

I was thinking of digging them up and moving them outward a few inches so they have room to expand. They are growing just fine, look very healthy, but I don't want to damage the roots.

Please advise - thanks!