As far as my understanding, nothing much different from what other plants do. Anybody with any experience with home plants will know that for most plants if yo

As far as my understanding, nothing much different from what other plants do. Anybody with any experience with home plants will know that for most plants if you cut off the tip of the plant/branch (places where new growth happens) it will promote sprouting more branches in lower parts of the plant. Most plants will have special places where new growth can happen and experienced florist/gardener can exploit this to shape the plant to their desire. As far as I understand, there is a chemical gradient that causes nutrients produced in roots to flow to the tips of the plant for growth. If you cut off the tips, there is no more a place where the chemicals are used and that abundance -- mismatch between the large root system and much less ability to consume -- is what triggers new growth. Here, you have an enormous tree with developed root system but you essentially killed/cut off the upper part. The abundance of nutrients causes new growth.