Potion of Plant Control

Basically, it lets you control some plants.

A 2"x2" area, 9" away. In those crazy D&D units, it means six square feet of plants, at 27 feet distance.

It lasts for 5-20 rounds.

To paraphrase: "Plants can do anything within their normal capabilities, remain still, move, entwine, etc..."

Hope that helps.