From Nookipedia, the Animal Crossing wiki
(Redirected from Dandelion Puff)
Dandelions are weeds that appear randomly in the player's town after March. They look like sun cosmos and have a color similar to the yellow tulips’. After a few dandelions, they become a Dandelion Puff. Dandelions do not affect the town's environment.
The player can plant dandelions around town or use them as furniture items. The player can also sell them to Tom Nook. Dandelions can be used as handheld items.
In Animal Crossing: City Folk, the dandelions are much more realistic, complete with seeds. The player has the ability to wear the dandelion before it transforms into a dandelion puff.
 Dandelion Puffs
The player can hold a dandelion puff; while holding one, the player can press "A" to blow on the dandelion puff, resulting in the seeds floating away. This can be done only for fun, and has no important use.