The depth of the weed line (maximum depth of submerged weed growth) varies greatly from lake to lake, depending mainly on water clarity. Aquatic plants require sunlight to grow, explaining why the weed line is deeper in a clear lake than in a murky one. In a lake where you can see a white jig in 10 feet of water, for example, the weed line might be 20 feet or deeper. But if the jig disappears at 2 feet, the weed line will probably be no deeper than 10 feet. The type of vegetation makes a difference, too; some plants require more light than others. In the same lake, for instance, cabbage might grow to a depth of 10 feet; milfoil, 17 feet; and coontail, 25 feet.