Watercress

Zone 3b Save Garden

🌱 35d to harvest Clumping

Peppery and luminous, Watercress brings a crisp, water-bright bite with a tender leaf texture that feels almost electric in the m…

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 19th
Transplant / Sow Outdoors	May 19th
Harvest Begins	Jun 23rd
Harvest Ends	Sep 21st

Crop Details

Trait	Value
Days to Maturity	35
Sun Requirements	Part Sun
Growth Habit	Clumping
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	40
Min Night Temp (°F)	28
Harden Off (days)	Not Required

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Frequently Asked Questions

What pest or disease commonly affects watercress (Nasturtium officinale), and how can I prevent it?

Watercress is prone to leaf spot and root/crown rot in consistently wet, poorly aerated soil, often worsened by dense growth. Keep plants spaced and growing in clean, cool water or constantly moist-but-not-soggy beds, and remove yellowing or spotted leaves promptly to reduce spread. If disease shows up, stop overhead wetting and improve drainage/oxygenation around the roots so the crowns dry slightly between waterings.

How often should I water watercress during its main growing phase?

During the active growth period, watercress (Nasturtium officinale) needs consistently moist conditions—aim for soil that stays evenly damp the entire time. Water lightly but frequently so it never dries out, especially in warm weather, and use cool water when possible to avoid stressing the roots. If growing in a bed or container, ensure good aeration so it stays wet without becoming stagnant.

How do I know when watercress is ready to harvest?

Harvest when shoots reach a usable size (often around 30–45 days, depending on conditions, with ~35 days typical) and stems are tender. Snip the outer stems first, leaving the crown intact so it can regrow for additional cuttings. If leaves turn tough or bitter as the plant bolts, harvest immediately at the tender stage rather than waiting longer.

Peppery and luminous, Watercress brings a crisp, water-bright bite with a tender leaf texture that feels almost electric in the mouth. At about 35 days, it forms an abundant mat of fresh, small leaves with a clean, green snap—ideal for brightening everything from quick fresh salads to vibrant sauces and quick pickles. Grow it for its signature sharpness and delicate, succulent character that stays lively even after brief handling.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 28°F before moving outdoors.

Expert Note

Keep watercress constantly wet (shallow running water or a permanently filled container tray) and harvest frequently to prevent bitterness.