We have a 70 ft. high, very healthy, Monkey Puzzle Tree. We usualy get about 20 pine cones dropping each year, They weigh about 25 lb. each when they drop. The tree is so full you can not see the cones forming. Is there any way to retard the growth of the pine cones? If not where on the tree are they forming? I would like to prune them prior to growth or at least before they fall.