Actually, after Elder Guo discovered this secret cache, his first reaction was: dig out these spirit plants and make good use of them.
He planned to use some himself and store the rest, and if he really needed money, he could always sell one or two of them.
He never considered continuing to grow them; these were all natural treasures several hundred years old and were already accustomed to this environment. Transplanting them was too difficult—if it failed, the loss would be huge.
Not to mention, this place had spiritual energy. Elder Guo couldn't just borrow such a piece of spirit field to plant spirit plants.
It wasn't until he discovered Huajun that he considered another possibility: Could I get it to help me grow spirit plants?
Feng Jun's words served as a wake-up call for him; even with the butterfly, you might not be able to properly grow spirit plants, let alone how to tame this butterfly, which was still a major issue.