Clovers are three-leaved plants in Pikmin and Pikmin 2, for the Nintendo GameCube and in Pikmin 3 for the Nintendo WiiU . These plants along with many others don't affect gameplay in the first 2 games. Usually iridescent Flint Beetle hide in here. In Pikmin 3, you can hide your squad and yourself under them.
Don't mistaken these for the clover item Science Project.
"This is a naturalized species. These plants are extremely persistent, and with the assistance of a symbiotic fungus that grows on its roots, the species is able to survive even in drought conditions. Typically, its leaves come in groupings of three, but intense impact on the leafing stem early in the development cycle can result in an extremely rare four-leaf cluster."
"Mildly poisonous. May result in nausea, headache, fever, fatigue, chest pains, paralysis, loss of bone density, moodiness, feral rage, sauciness, dilly-dallying, strokes of brilliance, and untimely doom."