Nasturtium officinale, Popularly known as watercress o watercress, is an aquatic plant that stands out for its culinary versatility, medicinal properties y ease of cultivation at home. This species has become popular in Spain, with particular roots in regions like the Canary Islands, although its consumption and cultivation are common in many countries thanks to its numerous benefits and adaptability to different humid environments.
Botanical and visual characteristics of the Nasturtium officinale
Watercress is a perennial family Brassicaceae, like other cruciferous vegetables such as broccoli, cauliflower and mustard. It grows mainly in freshwater streams, shallow rivers y sources of clean water, although it can be grown in controlled environments, such as pots and small ponds.
This plant has hollow, ascending stems up to 50-60 cm long, often branched and with roots that appear near the base. leaves They are dark green, alternate and pinnatisect, with obovate or oblong segments, the end being larger, with a fleshy appearance and crunchy texture. Its flowering, which can extend from spring to late summer depending on the climate, presents clusters of small white flowers with 4 crossed petals, typical of the Brassicaceae.
El fruit The watercress is an elongated, cylindrical silique containing small seeds occasionally used as a condiment. When the plant is exposed to air for long periods of time, the leaves and stems may acquire a purplish-brown hue.
Main varieties and types of watercress
- Watercress (Nasturtium officinale): The most common and consumed. It grows in clean, running water, with tender leaves and a fresh, slightly spicy flavor.
- Garden cress (Lepidium sativum)Known as cress, it is easily grown in the ground, with smaller leaves and a less intense flavor.
- Ground cress (barbarea verna): Also called yellow cress, it grows in terrestrial substrates, with a stronger and spicier flavor.
- River cress (Rorippa nasturtium-aquaticum): Often confused with watercress, but belonging to a different genus. Similar in flavor and use.
- Winter cress (barbarea vulgaris): Cold-resistant, with dark leaves and intense flavor.
- Rock cress (Arabia lyrata): Less common in food, with a rocky habitat and particular flavor.
Essential care for growing watercress
Watercress requires humid and clean environmentsTheir care varies depending on the growing method, whether in water or moist soil. Below are the key aspects for their proper development.
Cultivation in water
- Water quality: Clean, uncontaminated running water should be used. Change the water regularly in home systems.
- Depth: Maintaining between 2 and 5 cm of water is adequate, ensuring that the roots remain submerged.
- Lighting: It prefers semi-shaded exposure, avoiding direct light during the hottest hours to limit algae growth.
- Temperature: Best in cool to temperate climates. It does not tolerate excessive heat or severe frost.
Cultivation in moist soil
- Floor type: Rich in organic matter, with good drainage and preference for slightly acidic to neutral soils.
- Irrigation: Keep the substrate constantly moist, but not overly waterlogged. Frequent watering is vital.
- Weed control: Keep the area clear to avoid competition for nutrients.
- Fertilization: It is recommended to fertilize moderately with nitrogen-rich fertilizer to promote vigorous growth, preferably in spring and summer.
If grown in pots, ensure that the pot retains moisture, and in low temperatures, protect the plants from excessive cold by covering them with plastic or placing them in bright interiors.
Flowering and reproduction of watercress
El watercress blooms from spring to summer, displaying inflorescences in clusters of small, white, four-petalled flowers. Its flowering marks the beginning of the ripening stage; from this point on, the leaves may become stronger and its flavor intensify, so it's recommended to consume watercress before it flowers to enjoy its maximum tenderness and quality.
Harvesting can take place almost year-round, but is best during cool periods. Bunches of stems (about 8 cm) are cut and kept fresh by submerging them in water until ready to eat.
Nutritional and medicinal properties
The watercress leaves and stems stand out for their high in vitamins and minerals. They offer significant amounts of vitamin C, A and K, as well as iron, calcium, sodium, iodine, phosphorus, manganese, and vegetable fiber. Its calorie content is low (around 21 calories per 100 grams), making it ideal for healthy diets.
Watercress contains glycosides such as gluconasturtoside, bitter principles, enzymes and bioactive compounds with antioxidant, which helps prevent cell damage and contributes to overall well-being.
Among its medicinal uses, watercress is considered:
- Remineralizing and vitalizing in cases of weakness, anemia or intense fatigue.
- Diuretic, recommended for natural treatments of fluid retention, edema, kidney problems and hypertension.
- Purifying, useful for improving liver function and combating excess uric acid.
- Used in natural cosmetics for the care of oily skin and as a hair lotion against hair loss or seborrheic dermatitis.
- Traditionally used as an aid to improve gum inflammation (chewing fresh leaves).
Consumption, culinary uses and storage recommendations
Watercress can be used fresh in salads, in soups, creams, gazpachos, stews, and as a garnish for cold cuts. It is advisable to wash the leaves carefully to remove any residue of soil or microorganisms, especially if collected from the wild. To expand your options, you can also consult our recommendations on easy-to-grow garden plants.
To keep watercress fresher for longer, store it in the refrigerator, preferably wrapped in a damp paper towel in the crisper drawer. This will help maintain its freshness. crunchy texture y characteristic flavor.
Pests, diseases and common problems in cultivation
- Cruciferous hernia: Produced by a fungus that forms tumors on the roots, affecting growth.
- downy mildew: Appearance of yellow spots and gray or purple mold on the underside of the leaves.
- Oidium: Whitish layer on leaves and stems, controllable with natural fungicides and good ventilation.
- White rot: Appearance of a white cottony mass on the base and tissues, associated with excess moisture.
- Cabbage fly: The larvae damage roots, causing wilting.
To reduce phytosanitary problems, always grow in clean soil, renew water, and avoid waterlogging. Crop rotation and removing plant debris help significantly.
Contraindications and precautions for consumption
Although watercress is generally safe, there are certain circumstances in which its intake should be moderated or avoided:
- Thyroid disorders: Contains goitrogens that may interfere with iodine absorption. Responsible consumption is recommended for people with hypothyroidism.
- Wild watercress: They can accumulate parasites and bacteria in contaminated water. Thorough washing or consumption of watercress from controlled sources is essential.
- Vitamins and medications: Its high vitamin K content may interfere with blood thinners. Consult your doctor if you are taking specific medication.
- Digestibility: In sensitive people it may cause mild digestive discomfort.
Differences between watercress and lamb's lettuce
El watercress and lamb's lettuce They are often confused, but they have notable differences:
- Cultivation: Watercress requires humid or aquatic environments, while lamb's lettuce is terrestrial.
- Appearance: Watercress has larger, rounded, dark green leaves; lamb's lettuce has oval, tender, lighter green leaves.
- Taste: Watercress is somewhat bitter and pungent; lamb's lettuce is sweet and mild.
- Nutritional value: Watercress provides more vitamins C, K, iron, and calcium; lamb's lettuce stands out for its vitamin A and folic acid content.
Thanks to its ease of cultivation, culinary versatility, and health-promoting properties, watercress is an ideal choice for those looking to enrich their diet with a nutrient-rich and easy-to-maintain plant. If you have access to clean water or can provide a controlled, humid environment, growing watercress at home can be a satisfying and highly beneficial experience.
