Sun Bean

Sun Bean is a plant in Plants vs. Zombies 2: It's About Time introduced in Dark Ages. After a zombie eats a Sun Bean, it will drop a small sun for every normal damage shot that hits it. The zombie will faintly glow yellow and white to indicate that it is affected by a Sun Bean.

Plant Food Upgrade
Sun Bean turns bright yellow and when eaten, the said zombie will explode into 570 (change if wrong) sun

Strategy
The Conehead Zombie, Buckethead Zombie, Camel Zombies, Pharaoh Zombie, Poncho Zombie if it wears metal grates, Shield Zombie, Robo-Cone Zombie, Disco-tron 3000, and the Knight Zombie are the best zombie for this plant while regular zombies doesn't seemed to be of much use as they'll only drop low amount of sun. While they drop sun upon damage, best to use it while slightly boosting sun production by planting a Sunflower or a Twin Sunflower. When you have enough sun, you may wish to use the suns you have collected from the zombies to amass a column of Magnifying Grasses.

Trivia

 * It is the fifth plant to produce sun by some manner, the first four being Sunflower, Twin Sunflower, Sun-shroom, and Power Flower. It is also the second non-flower plant that can produce sun, the first being Sun-shroom.
 * Its name is a pun on the term "sun beam".
 * Sun Bean is the only plant (or at least the seed of a plant) so far to exist in Dark Ages because all the others are mushrooms which are fungi, despite mushrooms being considered as plants in the series.
 * Sun Bean is the first sun-producing plant that does not produce sun from itself.
 * Sun Bean is also the first sun-producing plant that is also a single-use plant.
 * If you feed more Sun Beans to zombies, they will produce more sun.
 * The almanac entry states that he is the oldest of the beans, which is actually true because Sun Bean is in the Dark Ages, which is currently the earliest time peroid in the game in which a bean plant appear, because there isn't any bean in Ancient Egypt, the earliest time period curently.