Portable spirit gardens were extraordinarily rare in the past.
The materials used to refine them were simply too precious. After the Immortal Realm endured a great demonic tribulation and the four major immortal cities were re-established, only two such gardens existed openly, and they were planted with exceptionally rare spiritual herbs. Every time those gardens were used, the lords of all four cities had to gather together.
As far as Luoxuan knew, no more than three such items were scattered outside.
Chapter 552