While you can normally earn free Fertilize Alls when harvesting from your Beehive, or receiving them as bonuses posted by your friends on their walls, for a very limited time you'll be able to send these fantastic items to friends for free, from the game's Free Gifts page.
If this is like any other "Limited Time" situation that has occurred over the past few months, this item likely won't be available to send for long - possibly not even a full day or more. That being the case, if you'd like to stock up on these helpful items, make sure to ask your friends to send you as many as possible, while the item is still available on the free gifts page.
What other freebies would you like to see added to the game's Free Gifts page? Do you like to use Fertilize Alls each time you harvest? Let us know in the comments.