Clover is easy to identify: Each stem has three small leaves (or leaflets) that are petal shaped and have a white "v" or crescent on each leaf, and are about a half inch long. White clover will usually bloom between early spring and late fall. The flowers are very small and are white or light pink.

Are there different species of clover?

There are over 300 different species of clover, but the type most associated with the rare fourth lucky leaf is the widespread white clover (so named because of the fluffy, delicious-looking white blossoms).

What's the difference between a shamrock and a clover?

You can easily spot the difference between the two because shamrocks have three leaves (or leaflets, technically) while four-leaf clovers have, obviously, four leaflets. It takes a rare genetic mutation to get that extra leaf which is why it's so difficult to find a four-leaf clover.