- 1 Pellet: The most common size of Pellet and the only kind found on Pellet Posies in Pikmin 1. If they are brought to the same colored Onion, they produce 2 Pikmin; if not, they produce just 1 Pikmin.
- 5 Pellet: A fairly rare Pellet, these were found on the ground or dropped by enemies in Pikmin, but Pellet-bearing Pellet Posies debuted with this Pellet in Pikmin 2 and again in Pikmin 3. If they are brought to the same colored Onion, they produce 5 Pikmin; if not, they produce only three Pikmin. The Pellet Posies for this plant are only found in the Valley of Repose.
- 10 Pellet: These are even rarer, as these are only in significant places in Pikmin, and only four reappearing Pellet Posies with Pellets of weight 10 are found in Pikmin 2: three in the Awakening Wood, and one in the Valley of Repose. If they are brought to the same colored Onion, they produce ten Pikmin; if not, they produce five. They are also dropped by the Toady Bloyster and the Spotty Bulbear (Day 30) in the Perplexing Pool. It is also dropped by the Fiery Bulblax in the Valley of Repose, the one that drops the Temporal Mechanism.
- 20 Pellet: The most rare of all, these are very large and very difficult to find; in Pikmin 2, there is actually a Pellet Posy for this Pellet that regrows, located near the Snagret Hole in the Awakening Wood, which bears the only 20 Pellet in the game. It is actually not as hard to get to as you may think. It does take a long time to start growing, but it is located just in front of the ship in the Awakening Wood, along with two 10s, a 5, and two ones. In Pikmin, a yellow 20 Pellet, presumably grown from a 20 Pellet Posy, is found on top of a tree stump in the Forest of Hope, where only Yellow Pikmin can reach it. There are also 20 pellets of all three colors lying around in the back area where the Pearly Clamclamps are at The Impact Site. There are many 20 pellets lying around everywhere throughout Challenge Mode as well. 50 pikmin maximum can carry a 20 Pellet, instead of the normal of exactly twice its weight. If they are brought to the same colored Onion, they produce 20 Pikmin; if not, they produce ten Pikmin.
When carrying Pellets, the ratio of weight to Pikmin carrying it will change color to indicate its destination. The color of the majority of Pikmin carrying it will determine its destination. As Purple and White Pikmin do not have Onions, the destination will vary. In these cases, if just one Purple or White Pikmin is carrying an object, it will be taken to the Red Onion; if two are carrying it, it will go to the Yellow Onion, while three will take it to the Blue Onion. Any number exceeding three will cause the cycle to repeat.
However, in Pikmin 3, since there is only one Onion for every species of Pikmin, the color of the majority of Pikmin will determine which color the Pikmin will be produced. If a new Onion is discovered, and if the majority of Pikmin carrying the Pellet are from the new Onion, the Pikmin will carry the Pellet to this Onion.
Pellet Posy Colors in Pikmin 2
At the start of Pikmin 2, all the Pellet Posies are red. The only color of Pellet Posies that can be seen, without counting those situated where the Onions of Blue and Yellow Pikmin are first encountered, are those colors of Pikmin that have so far been collected. The Pellet Posies where the Blue Onion is found are always blue and those where the Yellow Onion is first found are always yellow.
All other pellets constantly change color, once every few seconds, between the colors of the Pikmin that have so far been collected, in the order: red, yellow, blue. Pellets cannot ever be purple or white, or aid in producing purple or white Pikmin directly.
Trophy description for Super Smash Bros. Brawl
"Items that contain concentrated essence of the Pikmin's home world. This essence is the keystone to all life on the planet. Harvested from pellet grass or flowers, Pikmin can take pellets back to Onions to produce more Pikmin. If the Onion and the pellet are the same color, it produces more Pikmin. The number on the top of a pellet tells how many Pikmin must carry it."
The "Pellet Flowers" referred to in the description are Pellet Posies, yet "Pellet Grass" was not mentioned in Pikmin or Pikmin 2.
- If one were to get a pellet off a high ledge, it will occasionally flip over and show the reverse of whatever number the pellet had on it.
- It was revealed through the very first beta trailer of Pikmin that all enemies that died would turn into Pellets with a small sparkle of blue light, meaning that enemy corpses may have not been an idea at the time.
- The beta trailer also showed that forty pellets were going to be included, but were taken out.