The thoughts of those Deities were also what Zhou Tian had considered at that moment; it was simply a matter of handing the task over to the plants when they couldn't capture Zhou Tian themselves.
Just as Zhou Tian utilized those plants, since Zhou Tian could easily employ the plants to do his bidding, the Deities, relying on their abilities, could similarly use the plants to achieve their goals.
And evidently, judging by the situation at the time, those Deities had succeeded in achieving their objectives.
Given the prior circumstances, those Deities originally thought capturing Zhou Tian was essentially an impossible task. If things continued, it was certain that the Deities would not end up well. Thus, due to their inability to capture Zhou Tian at that time, the Deities made that prior response.