
Nasturtium officinale
Watercress is a hardy perennial leafy crop that grows best in shallow running water or very wet soil. In the UK it’s usually grown outdoors in a pond basket, streamside bed, or container kept constantly wet, and it gives the best leaves in cool weather.
Step-by-step instructions for growing Watercress
Sow seeds around 17th January - 19th April on the surface of very moist compost, then press them in lightly rather than burying them. Keep the compost constantly damp while they germinate, and sow a fresh batch every 21 days for a steady supply.
When seedlings are large enough to handle, from 18th March, thin them so the strongest plants have room to spread. Keep the soil wet at all times, because even brief drying checks growth.
Move seedlings to their final spot around 5th March - 16th April, spacing them well apart in mud-like soil or a shallow run of water. Water in thoroughly straight after planting and keep the roots submerged or constantly wet.
From 26th March, give a very light liquid feed every 14 days if growth slows, but avoid strong feeding that makes the leaves coarse. Keep the bed weed-free and topped up with water.
Start cutting from 22nd April when plants are well rooted and the shoots are leafy. Pick little and often through to 25th November, taking the outer stems first and leaving the centre to regrow.
Tap a plant to see why it works (or doesn't) with Watercress.
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.