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Nasturtium officinale

Also known as

Southern Watercress

Full Sun
Easy care
Frequent watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size









  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

Watercress Overview

Nasturtium officinale is commonly known as Watercress. It is an aquatic, hardy perennial herb that is one of the easiest plants to grow, especially for hydroponic cultivation. It looks delicate, but has a sharp, peppery taste. It enjoys "super-food" status due to its health benefits, from its antioxidant and anti-cancer compounds. The natural habitat of this fast-growing plant is in streams and it is an indicator of water quality. However, it can multipy itself and become invasive.

Common problems with Watercress

Snails. Whiteflies and Spider mites are problems, but can be held in check by ladybirds.

Watercress Companion Plants

Grow alongside aquatic plants.

How to harvest Watercress

For fresh use, harvest watercress sprigs year round when they are 10 - 15 cm in length, aoubt 8 weeks after sowing. Simply cut the cress; the plant will send out new shoots soon. You can get up to 10 pickings a year. Leaves turn bitter once flowers start blooming.

How to propagate Watercress


The preferred method, because cultivated plants are prone to viruses. Sow the tiny seeds lightly in Spring, in wet, enriched soil. Germination in about 8 days.


Almost any part of the plant, even a single leaf, will form roots in ideal conditions - clean, slow flowing water, about 5cm deep.

Special features of Watercress

Crop rotation

Light feeder.

Wet sites

Watercress loves clear, running water, but is very adaptabe. Found in the wild in flooded areas. Ideal to plant in a water feature in the garden.

Pot plant

It will do well in a pot that stands in a container filled with water.

Attracts useful insects

Bees like the pollen-rich flowers. Host to beneficial spiders and beetles.

Repels harmful insects

Deters cucumber beetles.

Other uses of Watercress

It is culinary-known as a salad plant and is rich in vitamin C and iron.


Helps to treat various ailments eg. digestion, TB and arthritis, and reduces the risk of disease. High in Vit A and C, Iron and Calcium. Traditionally used on hair, to promote growth.


The sprouts, leaves and stems are used in countless ways in salads, sandwiches and cooked dishes. Nutrition wise in the same league as spinach and cabbage.

Edibles to Sow Outdoors in May

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