FarmVille is set to release a new deco building that is upgradable and can be upgraded also. That is the FarmVille Rainbow Pond and players will be helping Iris to build it. Once completed in can now be harvested for Rainbow Iris Seeds. If you want it to have a greater chance on getting more packets of Rainbow Iris Seeds you must constantly upgrade it until you reach the final stage. The more upgrade it has the better chance of getting more.
Parts for the Rainbow Pond:
Star Dust, Fairy Magic and Enchanted Mist
Iris Rainbow Pond Stages:
The Rainbow Pond can be harvested for seed packets of Iris Rainbow:
Rainbow Iris Bushel