I was a bit surprised how well the watercress is growing in our aquaponics system in this heat (up to 108˚). We run 3200 gallons of water per hour through the gravel lined grow beds to simulate a running stream and filter the fish’s water. Watercress is one of the more amazing vegetables. There are some amazing health benefits of watercress. We eat it raw on sandwiches, salads, baked potatoes, pasta and–oh, everything. And since it grows over the tilapia I should try a watercress atop tilapia recipe. The tilapia are only two inches long right now so I will wait.