1. A number of human health problems, e.g. allergies and skin problems, are caused by IS such as the Giant hogweed ( Heracleum mantegazzianum ) and the Common hogweed ( Ambrosia artemisiifolia ).

2. Shandy, on loan from Balaclava Agricultural College to a seminar in Wales on How to Contain the Giant Hogweed, travels backward in time with colleagues Daniel Stott and Timothy Ames--to the medieval era, replete with knights, castles, witches, griffins, prithees, mayhaps, and Belikes.