Posted: 07/08/2016 at 17:00
the one in the neighbour's garden will be a rudbeckia I should think. You'll have to find a tactful way of asking for a piece without implying that he doesn't know what's what in his garden.
Cut the leaves off right to the bottom of the stems. If it was my garden, with its rock solid soil, I's pot it up til it got some root and leaves and plant out in autumn