After all, no one can guarantee whether these dangerous plants will release some toxic gases.
If they do release toxic gases, then they will surely be eroded by these toxic gases, and enveloping them with an Array is the best solution. Of course, this Array is not simply for defending against the plants inside but also needs some filtration system. If it's only defending against the plants, then when purifying, they certainly cannot be purified. After all, when Ye Tianfan purifies, he will surely envelop all the already occupied territory at once and then begin the purification.
