The shrub layer includes gorse, buckthorn, privet and bramble. A privet is a flowering plant in the genus Ligustrum. These insects deposit their secretions on the branches of certain species of "Ligustrum" (privet) tree. Its gravel walks were laid in 1854, with privet hedges planted around its perimeter. The northern side is dominated by bracken, bramble, privet, hawthorn, cowslips and bell heather. "Ligustrum lucidum" is sometimes also called "Chinese privet". A further six are specific to ash and its Oleaceae relative wild privet ("Ligustrum vulgare"). Host plants include maples, dogwoods, hawthorns, willows, elms, privet, black locust, and elder. It also has scrub with wild privet, dogwood and the wayfaring tree. In the woods shrubs such as wild privet and spindle can be found. The name "Chinese privet" is also used for "Ligustrum sinense". The foliar treatments are most effective against dense thickets of privet. The UGA Media Guide claims that the hedge is an "English privet hedge". The roots of privet can reproduce asexually through root suckers. Insects are greatly affected by the proliferation of invasive species such as privet.