How do I send a bush to a friend?

We already have an answer for a similar question which you can see here:
How can you gift bush on friend's sunflower island?

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If you are Facebook friends, they should appear in your list of boat friends that you can visit. You'll need to know their game name. Once you visit their island, you can give them a bush.

If their island does not appear on your list, despite being Facebook friends, try disconnecting then reconnecting the game to Facebook in the game settings "social" tab. Your friend should do the same. If that still does not work, one or both may need to reinstall the game and give Wooga permission to the Facebook friend list. If that still fails, contact Wooga support for additional help.