Leafy green
Can you grow Watercress on a balcony?
Nasturtium officinale
Possible, but tricky in pots
Watercress (Nasturtium officinale) can be grown on a balcony in a suitable container. It needs partial shade — around 4+ hours of direct sun a day. Harvest peppery leaves as needed once established; plants don't store well, so pick only what you use immediately.. All figures below are sourced from RHS and the Old Farmer's Almanac.
Sun
⛅ Partial shade (4+ h)
Water
High
Difficulty
Moderate
Hardiness
USDA 6-9
Container fit
Challenging
Sow
Sow in spring; needs constantly wet, humus-rich conditions. Can be grown from seed or rooted cuttings.
Harvest
Harvest peppery leaves as needed once established; plants don't store well, so pick only what you use immediately.
Good companions: Mint
Balcony tip: Stand a pot in a tray or water-filled bucket so the compost never dries out; watercress must stay permanently wet.
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What size pot does Watercress need?
Container size for Watercress isn't specified by our sources for a single value — as a rule, give roots room and don't let a small pot dry out. Check the linked RHS/Almanac page.
How much sun does Watercress need on a balcony?
Watercress wants partial shade — about 4+ hours of direct sun daily. Match it to your balcony's aspect before buying seed.
When do you sow Watercress?
Sow in spring; needs constantly wet, humus-rich conditions. Can be grown from seed or rooted cuttings.. Timing shifts with your climate/USDA zone — the linked sources give the detail.
Sources & date
- RHS: Watercress
- Old Farmer's Almanac: Watercress
- Data as of: 2026-07-10
- Container sizes and timings are guidance — adjust to your climate/USDA zone and balcony aspect.