When the weather is dry the pine cones open up and when it’s going to rain they close down. It’s a really fun way everyone in 1D to observe the changes in the pine cones and to predict what the weather will be like.
Pine cones open and close depending on the humidity to help seed dispersal. Inside the pine cone there are lots of feather light seeds. When the weather is dry the pine cone opens up and any wind will catch the seeds and allow them to be dispersed in the air far away from the original tree.
When the humidity rises and rain is likely then the pine cone closes up to prevent the seeds escaping as being so light the seeds will become water logged and they will travel only a short distance from the original source which would be shaded and have to fight the “parent” tree for resources