Alatar, If they did they must have left a lot of them as there are dozens of plants called "dragons blood" most famously Draceana draco (
www.mgonlinestore.com) the dragons blood of medicine and violin manufacture. As a warning I would also point out not to go smearing croton sap on you wounds unless you know what you are doing as Croton is in the Spurge family (Euphobiacae) most of whose members are famous (or more acurately infamous) for having unbelivablly corrosive sap.
by the way check out this plant
www.infojardin.com. Its called Chiranthodendron pentadactylon or in common name hand flower, anyone think that this could be a vegitative remmenent of Saruman's legacy?
I'm not surpised your grandfather's (that is what gaffer means right?) williow fence took root and grew. Willow is famous for doing that. It's one of the main reasons whiy some cultures used williow trees as symbols of immortality and resurrection.
By the way a though ocurred to me with regards to wether a true ebony could yield a piece of wood staight and large enough to yield a staff of hobbit size. As I recall an ebony staff is the badge of office of the so called "Black Rod", the king or queen's liason to Parliament. However never having seen a Parilamentary opeing I have no idea as to how large this staff is. If any of our UK members are here and have perhaps they could enlightent us. If it really is a full size staff that would prove that a solid ebony walking stick could at least be possible.