Everything needs water to grow, for certain, but too much rain can leave plants sitting in muck and drown their roots. In extreme cases, water becomes flood and plants are washed away, even when they’re grown in buckets. When floodwaters are swift enough they sweep through high tunnels and wash away everything in their path, leaving nothing but tangled masses of vegetation behind. Even deep-rooted, established plants and vegetables growing in strong, anchored containers don’t survive.