The terrace levels have stone walls and steps, with the walls covered by English Ivy. The species are pests of citrus, sago palm, oleander, English ivy, and palm, among others. Roses, hollyhocks, iris, English Ivy, and privet hedges also feature in the landscaping. Some of the individual gravestones are covered by English ivy and vinca. Blackberries and English ivy have invaded the bush and the jetty has become hazardous. Oriental Bittersweet, Oriental Wisteria, and English Ivy all can damage and kill trees by girdling. The introduced species English ivy ("Hedera helix") has invaded one population. Invasive plants include Himalayan blackberry, English ivy, reed canarygrass, purple loosestrife, and Japanese knotweed. Invasive species include English ivy, European holly, clematis, morning glory, and Himalayan blackberry. Invasive species are English ivy, European holly, clematis, morning glory, and Himalayan blackberry. Under this definition, well-known members include carrots, celery, parsley, and "Hedera helix" (English ivy). "Hedera helix" (English ivy), and "Delairea odorata" (cape ivy).