One of the most common submersed lake weeds is Bushy Pondweed. Bushy Pondweed is a rooted native weed that grows up from the pond bottom. It has thread-like narrow leaves oppositely arranged on slender, sparsely branched stems. Lake weed identification can be made by the microscopic teeth along the leafs edge. Bushy Pondweed leaves are also slightly broader at the base than tip. This water weed can be found growing in depths of 10 feet or more.