The Islamic influence on Horticulture has been significant, particularly in the Iberian Peninsula (present-day Portugal and Spain) and, as a result of the predominance of Portuguese and Spanish explorers in the discovery of the New World, also important in the Horticulture of Latin America.
At right you see the Canal Garden of the Generalife in Granada [which] makes the most of a limited water supply. Evergreens, vines, and flowers surround a long shallow pool rimmed with a double row of fine jets. [Douglas et al. (1984) Garden Design. Simon & Schuster, NY p. 22]
The Islamic influence included tools and technology from China: gunpowder, paper making, the compass. These developments would whet an appetite for more riches from the East which led to the great explorations that resulted in the discovery (from the European/Western perspective) of the Americas.