Sunflower

The  is a Flower. It can only be obtained through the Flower Minion or from other players.

Flower Minion
The Flower Minion generates different types of flowers, including Sunflowers.

Bonemeal
If you use bonemeal on the top block of a sunflower, Another sunflower will pop off of the original sunflower. This can be useful for obtaining large amounts of sunflowers without having a flower minion.