1 accident : 1 design.

      When/whence it came I know not; I only think it snuck in after Alice snuck out.  It was instantly/obviously a "Blackite" (Bramble), "Not only but also"© it was thornless.
     In view of the fact that they're happy to propagate vegetatively, via Stolon, I decided to move it via stolon; which is where the accident/design sneaks in.
      The design first - B - was intended, and worked.
      The accident now - A - decided it wanted to be a second plant while I was hibernating, since persuaded that was not the idea.