Melon Seeds

Melon seeds are an item that can be used to grow melon plants.

Melon stems
Melon stems, when destroyed, may drop 0-3 melon seeds.

Nether reactor
In Pocket Edition, melon seeds are one of the many items spawned by the Nether reactor

Farming
Melon seeds can be planted only on farmland. Over time, they grow into a stem and produce a melon on any adjacent dirt, grass, or farmland block. If a melon is already occupying an adjacent dirt/grass or farmland spot, the stem will not grow any more melons until the melon is removed. A single stem can grow an unlimited number of melons. Like other seeds, they need a certain amount of light to grow. Melon seeds are affected by bone meal only with respect to stem growth -- bone meal does not help produce the actual melons.

Melon Stem
A melon stem is the block that is planted on farmland when melon seeds are used on it. It starts underground, and rises up as the plant grows. The stem is colored green when young, and then brown once fully grown.

The stem will curve once a melon has grown off of it. A single stem will connect to any melon in an adjacent square, thus there are 5 possible appearances to a stem. If there are multiple melons it can connect to, it will favor the east, then west, north, and south. When the melon is removed, the stem will return to its straight shape.

Breeding
In Pocket Edition, chickens can be bred with melon seeds.