What do the different fertilizers do?

Fertilizers will reduce the growing time of your plants. Right now you can only buy them with Playfish Cash, and receiving them from quests, don’t know if they will add it for coins in the future or if it will stay this way.

You can find out how much time they reduce by clicking on them in the store fertilizer tab.
Level 1 Fertilizer : 2 Playfish Cash reduces grow time by 4 hrs
Level 2 Fertilizer : 4 Playfish Cash reduces grow time by 9 hrs
Level 3 Fertilizer : 6 Playfish Cash reduces grow time by 14 hrs
Level 4 Fertilizer : 8 Playfish Cash cash reduces grow time by 19 hrs
Level 5 Fertilizer : 10 Playfish Cash reduces grow time by 24 hrs