Curly-leaf pondweed is an invasive species present in Lake Johanna.
Timing of spring spraying
It is the first plant to appear in the spring. However, if the water temperature isn't warm enough (greater than 50 degrees), and native species (e.g., Coontail or Northern milfoil) and filamentous algae aren't sufficiently mature, we miss the "sweet spot" for the broadest control. Its a delicate balance that also has to accommodate the contractor's schedule for other lake associations.