Images of top-grade Spiritual Roots flashed through Luo Qing's mind. Of course, he had no intention of using them as raw materials.
With only these few Spiritual Roots, at most, he could refine dozens of Top-grade Innate Spiritual Treasures.
What Luo Qing was considering was which super-grade Spiritual Root could be used to rapidly cultivate a large batch of high-quality subsidiary plants.
As long as the subsidiary plants reached the quality of Advanced Innate Spiritual Roots, they would barely be sufficient to refine Top-grade Innate Spiritual Treasures.
When it came to experience in reproducing subsidiary plants, the most accomplished was undoubtedly the Lunar Laurel Tree on the Lunar Star.
Now, the Laurel Trees on the Lunar Star had already covered half the planet's surface.
The reproductive ability of the Lunar Laurel's subsidiary plants was plain to see.
However, it was not without problems. The number of subsidiary plants of Advanced Spiritual Root quality that the Lunar Laurel could reproduce would inevitably be limited.
Moreover, the time required for a high-quality subsidiary plant to mature had to be calculated in Kalpa Cycles.
If the Lunar Laurel wanted to reproduce the number of subsidiary plants Luo Qing needed, it would probably take at least a hundred Kalpa Cycles to get started.
A hundred Kalpa Cycles was twelve million years—and that was only the beginning. The time required was simply too long.
In the end, Luo Qing fixed his gaze on the Chaos Reincarnation Willow Tree.
As a Chaotic Spiritual Root at the Primordial Chaos level, it had never reproduced subsidiary plants before. However, he presumed that nurturing subsidiary plants of Advanced Spiritual Root quality would be much easier for it than for a Top-grade Innate Spiritual Root.
Furthermore, with an entire Netherworld World available for the Chaos Reincarnation Willow to use, the