When you wander through the produce aisle, your cart probably rolls right past watercress without a second glance. Tucked between the delicate baby spinach and the sturdy kale, this cluster of small, round leaves with thin stems often gets overlooked. But that is a shame, because watercress quietly ranks as one of the most nutritionally dense foods on the planet. In fact, according to the Centers for Disease Control and Prevention, watercress scores a perfect 100 on the Nutrient Density Index, beating out kale, Swiss chard, and even spinach. For American adults who are trying to eat better without turning every meal into a complicated project, watercress is the friendly, affordable, and surprisingly versatile green that deserves a spot in your regular rotation.

Watercress belongs to an ancient family of aquatic leaf vegetables that grow in cool, flowing water. It has been part of human diets for thousands of years. The Greeks and Romans prized it for its sharp, peppery flavor and believed it boosted physical stamina. Persian soldiers ate it to stay strong on long marches. Yet today, most people only encounter watercress as a sad little garnish on a fancy brunch plate. That is a wasted opportunity. A single cup of raw watercress provides more than a full day’s vitamin K, which supports bone health and proper blood clotting. It delivers ample vitamin C to keep your immune system humming, along with vitamin A for healthy vision and skin. You also get respectable amounts of calcium, magnesium, and potassium – all for roughly a handful of calories. Few foods can match that kind of return on investment.

What really makes watercress remarkable, though, are its glucosinolates. These naturally occurring compounds break down when you chew the leaves into isothiocyanates, a type of antioxidant that has been studied for its potential to protect cells from DNA damage and slow the growth of certain cancers. While no single food is a magic bullet, incorporating watercress regularly into your diet is an easy way to boost your daily intake of protective plant chemicals. The peppery bite you taste is actually the signal that these powerful compounds are active and ready to work. That little punch of flavor is a reminder that this is a green with serious personality, not just a passive pile of foliage.

The best part about watercress is how easy it is to love. It grows in bunches that look delicate but hold up surprisingly well. You can treat it the same way you would baby spinach or arugula. For a quick lunch, toss a handful into a salad with some sliced pear, walnuts, and a simple lemon vinaigrette. The peppery notes cut through the sweetness beautifully. Watercress also wilts gracefully, so you can fold it into hot soups, stir-fries, or scrambled eggs right at the end of cooking. It makes an excellent base for pesto, giving it a fresh, slightly spicy kick that regular basil cannot provide. You can even pile it onto a turkey sandwich in place of lettuce for an upgrade that requires zero extra effort. If you are someone who thinks salads are boring, watercress’s bite might just change your mind.

One reason people hesitate to buy watercress is uncertainty about how to store it and whether it is safe to eat raw. In the past, watercress grown in wild streams could harbor parasites or bacteria, but nearly all commercial watercress today comes from hydroponic greenhouses with clean, controlled water. That makes it perfectly safe to enjoy fresh, provided you give it a good rinse under cold water before using. To store, wrap the bunch loosely in a damp paper towel, place it in a sealed container, and keep it in the crisper drawer. It will stay crisp and happy for about five days. If the leaves start to look tired, do not trash them – dunk the whole bunch in a bowl of ice water for ten minutes to bring them back to life.

Adding watercress to your routine is also a smart move for anyone concerned about the environmental impact of their meals. Because it grows in water, it requires no soil and very little land. It grows quickly year-round, so you can find it at most grocery stores regardless of season. And unlike some trendier superfoods that have to be shipped across the globe, watercress is often grown locally throughout the United States. That means you are getting maximum nutrition with a smaller carbon footprint. Plus, it is usually remarkably inexpensive – often less than two dollars a bunch – which makes eating well more accessible for everyday household budgets.

So next time you are shopping for greens, give watercress a chance. Let go of the idea that you need to create a complicated kale smoothie or an elaborate arugula salad to be healthy. Sometimes the most humble-looking plant in the produce section is the one that has been quietly delivering excellence for centuries. Watercress is crisp, vibrant, and loaded with everything your body is asking for. Whether you add it to your morning eggs, layer it into a wrap, or simply eat it straight from the bag while you are prepping dinner, you are doing something genuinely good for yourself. That intense little leaf might not look like much, but it has earned its place as a true aquatic superfood. Give it a try – your next meal just got a whole lot greener.