Privet (both species) was originally introduced as an ornamental plant, generally for hedging, but both are now widespread weeds. They infest disturbed land, native bushland and gardens and are aggressive invaders. They have no serious animal predators or diseases and have great regenerative ability, growing from root and stem suckers. Both produce large number of berries which are attractive to birds which distribute the seeds over wide areas. The berries are reported to be poisonous to humans and in Spring and early Summer both produce large amounts of pollen which can cause allergic reactions in some people, particularly asthma and hayfever sufferers. Control is by preventing spread and infestation of new areas and by physical removal of seed trees and young seedlings. When trees are felled treatment of the stump with herbicide is necessary to prevent sprouting and suckering.