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Watercress Cultivation Watercress is a perennial cultivated for its clean, slightly peppery tasting leaves and stems. Seen wild, it grows partially submerged in running water and flooded areas in moderately cool climates. If you have a water feature in your landscape, this is a great place to cultivate watercress, but don’t despair if not. Watercress can also be grown in consistently wet soil with a soil pH of 6.5-7.5 in full sun, or you can mimic natural conditions by growing watercress plants in a bucket or other container. In the garden proper, you can dig out a 6-inch (15 cm.) furrow, line it with 4-6 mil polyethylene and then fill with 2 inches (5 cm.) of composted soil or peat moss. Of course, if you have a running stream on your property, watercress cultivation is about as simple as it gets. Growing Watercress Plants Watercress can be grown from seed, transplants or cuttings. Watercress varieties abound, but the most common home grown variety is Nasturtium officinale. Prior to planting, choose a sunny location and amend the garden soil with 4-6 inches (10-15 cm.) of composted organic matter down to a depth of 6-8 inches (15-20 cm.). Seeds are tiny, so they need to be lightly broadcast over the prepared site. Sow three weeks before the frost-free date for your area. This plant germinates best in cool conditions (50-60 degrees F. or 10-15 C.) but not frigid. Keep the planting area moist but not covered with water. Container grown plants can be placed in a saucer filled with water to retain moisture. Seedlings will appear in about five days. If you are transplanting, space the plants 8 inches (20 cm.) apart once all chance of frost has passed. Care of Watercress Consistent moisture is the number one concern in the care of watercress; after all, water is its milieu. Container grown plants can be placed in a bucket filled with 2-3 inches (5-7.5 cm.) of water so the roots stay submerged. Although the plant does not have high nutrient requirements, cultivated cress may show signs of potassium, iron or phosphorus deficiencies. A complete soluble fertilizer applied at the recommended rate should mitigate any of these issues. In the garden, keep the area around the plants free from weeds and mulch to aid in water retention. Snails love watercress and should be removed by hand or trapped. Whiteflies also like the plant and can be controlled with soapy water or insecticidal soap. Spider mites cause leaf discoloration and general deterioration of the plant. Natural predators such as lady beetles, predatory mites or thrips can help control these pests. 4 seeds