Nectar weed

Nectar Weed is found in a number of overground areas in both Pikmin games, and resembles a patch of long grass. Its purpose for Pikmin is as a source of Nectar: they can extract pools of Nectar from it seemingly by plucking out single leaves of grass. There is no need to swarm the Pikmin to the patch, as they will attempt to use it whenever they walk over it. Only five Pikmin can be pulling a patch of nectar weed at a time.

As with Rubble, Nectar Weed can be found in every area of Pikmin 1, but only in the Awakening Wood and Perplexing Pool in Pikmin 2, and never underground.

Pikmin: Attack of the Breadbugs
Nectar Weed acts like it did in previous games, but ten Pikmin may pluck patches of Spray Weed at once. Nectar Weed can be found in the Beginner Territory, Marsh Territory, Loaf Territory, and Hidden Territory of the Land of Wonders. Captain Olimar can assist Pikmin in plucking Nectar Weed, even if ten Pikmin are already plucking it. This technique can be used to pluck a patch of Nectar Weed very quickly.