Which plant is NOT tolerant to drawdown?

Waterlilies are not tolerant to drawdown because they are rooted aquatic plants that thrive in stable water levels. They require consistent submersion to maintain their buoyant leaves and vibrant flowers, which are often only visible above the water's surface when conditions are favorable. When water levels drop, waterlilies can suffer from exposure to the sun, leading to desiccation and damage to their growth. Unlike some other aquatic plants—such as cattails, sago pondweed, and coontail—that can adapt to changing water levels by regenerating or rooting deeply enough to survive variations, waterlilies do not possess this resilience. Therefore, maintaining steady water levels is crucial for their survival and growth.