Island farms (candy, tropical etc.) in our browser game will always run temporarily, this is an intended feature. These farms are not meant to be an extension of your main farm but work as an optional benefit to any players who do choose to use them. The remaining time can be checked in several places, such as the main event window and the world map, so do keep an eye on it.
Every time the islands close they get reset. This means your buildings and other items are removed and converted into temporary currency. This currency can then be used to purchase different items from the trader for your main farm, ranging from seeds to buildings.
It is important to know, that in order to get access to temporary island farms, players must be at least level 35.