When sugar cane and cactus blocks trigger growth and spawn a new block on top of them, the base block's age is not propery reset to 0.

This is because of two lines of code that were probably disabled by accident:

BlockCactus.java line 37:
// world.setTypeAndData(blockposition, iblockdata1, 4); // CraftBukkit ​

BlockReed.java line 34:
// world.setTypeAndData(blockposition, iblockdata.set(BlockReed.AGE, Integer.valueOf(0)), 4);​

I've already confirmed that re-enabling those two lines fix the isssue.

Fother discussion can be found here:
http://www.spigotmc.org/threads/cactus-and-sugar-cane-growing-very-fast-in-cerain-worlds.37400/