Rhubarb is a seed in FarmVille, available after reaching level 11. The seeds cost 65 coins to plant, and can be harvested every sixteen hours for 150 coins. They also award 1 XP per plot.
Freshly planted Rhubarb.
Rhubarb at 33% growth.
Rhubarb at 66% growth.
Rhubarb ready to be harvested.
Rhubarb treated with Crop Fertilizer.
Rhubarb after having withered.
Though its stalk is tart and good for cooking. Rhubarb leaves can be toxic.