First, currently there are no other living beings in this perilous environment. No matter what it was like before, the only inhabitants of that domain now are those plants. From this perspective, as long as one can avoid those plants, there really aren't any great dangers.
Secondly, Zhou Tian also discovered that the number of those plants is not very large. Although the plants they encountered were not all the plants of that perilous environment, excluding the ones Zhou Tian and his team encountered, even if there are other plants, their number is not much.
Given the situation at the time, from all aspects, Zhou Tian and his team had already experienced the greatest danger of that perilous environment. Having barely escaped with their lives from the clutches of those plants, the perilous environment was unlikely to pose a significant threat to Zhou Tian anymore.
