A tropical garden features tropical plants and requires good rainfall or a decent irrigation or sprinkler system for watering. These gardens typically need fertilizer and heavy mulching. Tropical gardens are no longer exclusive to tropical areas. Many gardeners in colder climates are adopting the tropical garden design, which is possible through careful choice of plants and flowers. Main features include plants with very large leaves, vegetation that builds in height towards the back of the garden, creating a dense garden. Large plants and small trees hang over the garden, leaving sunlight to hit the ground directly.