Why do pinecones bloom violently when the weather is dry?

According to the principle of liquefaction

Opening and closing of pine cones: on dry days, the scales of pine cones will open; On the contrary, if the scales of pine cones are tight, it means it will rain. This is because when the air is dry, the scales dry and harden, and the scales shrink; When the air is humid, the scales will absorb water vapor and soften, and the pinecones will naturally return to their original state. Perceive tmall