A Homemade Remedy to Kill Hydrilla
- 1). Manually pull up any of the hydrilla stems that appear. Collect and compost the plant parts so that they do not reestablish themselves after you have pulled them.
- 2). Drain the pond if possible to expose the plants to direct sunlight, drying out and killing the plant at the same time. Remove manually as many plants as possible to help prevent them from regrowing once you refill the pond.
- 3). Cover the bottom of a shallow body of standing water with an opaque sheet of plastic to block off the sunlight from the hydrilla plants. Lay sections of the plastic on the floor of the pond and secure it with rocks.
