Pine cones are wrapped in pine cones.

The scales of most pine cones open soon after they mature, and the seeds fall off quickly (Pinus massoniana, Pinus tabulaeformis, etc.); There are a few pine trees whose scales open and seeds fall off for several months. Some pine trees, some or all of the cones are closed during the year or open irregularly on the trees. Korean pine cones are large and heavy, and they are easily blown off by the wind before and after maturity.

here is a picture of the pine ball: