According to Gu Shanhai's estimates, Shen An could only plant a maximum of four Spirit Plants within himself.
The first two Spirit Plants chosen for him by Gu Shanhai were the Ginseng Baby and Vine Dragon Wood, primarily for extending one's lifespan. For the remaining two, Gu Shanhai did not intervene, allowing him to make his own choice.
With the current progress, Shen An would need at least a decade to breakthrough to the Purple Mansion Stage. Now ten years old, he would be twenty by the time he reached the Purple Mansion Stage, at which point he would be sent to Chengyun Sect for better education.
What he could teach was actually quite limited. In terms of cultivation, a single "Green Emperor Longevity Scripture" was enough, and he had also taught him about life. The extent to which he could comprehend and utilize it was up to him, not Gu Shanhai.
Shen An was different from him; he lacked sufficient experience.