A large selection of plants and flowers are available in artificial materials.   Sometimes referred to as silk flowers, most are made of polyester and plastic.   There are roses available with artificial water droplets on the leaves!   Large trees such as the Ficus benjamina have a real wooden stem and are available up to 15m tall.   The vast majority are suitable for indoor use only although there are weather resistant box ( buxus) shrubs in round and pyramid shapes, conifers, bay trees, Ivy and some grasses.