Water gardens, and water features in general, have been a part of public Asian outdoor fountains private gardens since ancient Persian gardens and Chinese gardens. Department of Agriculture and Fisheries of Queensland. This page was last edited on 22 Novemberat Design by Falling Water Design. Some species of algae, such as "blanket weed", can grow up to a foot a day under ideal conditions and can rapidly clog a garden pond. Koi have been Asian outdoor fountains used in Asian ponds to symbolize good luck and wealth.