Flower
Can you grow Sweet Pea on a balcony?
Lathyrus odoratus
Yes — grows well in pots
Sweet Pea (Lathyrus odoratus) grows well on a balcony in a suitable container. It needs full sun — around 6+ hours of direct sun a day. Cut flowers regularly through summer; deadhead often to prolong flowering.. All figures below are sourced from RHS and the Old Farmer's Almanac.
Sun
☀️ Full sun (6+ h)
Water
Medium
Difficulty
Easy
Hardiness
Annual (hardy annual; tolerates light frost)
Container fit
Good
Sow
Sow in pots or rootrainers in autumn or early spring (soak seeds overnight to aid germination) and plant out in April, or sow direct in mid-spring. Choose dwarf varieties for containers.
Harvest
Cut flowers regularly through summer; deadhead often to prolong flowering.
Good companions: Chives, mint, alyssum, carrot, corn, cucumber, radish, turnip, beans
Avoid nearby: Do not plant near edible garden peas; all parts of sweet pea are poisonous
Balcony tip: Pick dwarf bushy varieties such as 'Snoopea' or 'Bijou' that need no support for pots and window boxes; grow in fertile well-drained compost in full sun and feed a balanced liquid fertiliser every two weeks.
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What size pot does Sweet Pea need?
Container size for Sweet Pea 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 Sweet Pea need on a balcony?
Sweet Pea wants full sun — about 6+ hours of direct sun daily. Match it to your balcony's aspect before buying seed.
When do you sow Sweet Pea?
Sow in pots or rootrainers in autumn or early spring (soak seeds overnight to aid germination) and plant out in April, or sow direct in mid-spring. Choose dwarf varieties for containers.. Timing shifts with your climate/USDA zone — the linked sources give the detail.
Sources & date
- RHS: Sweet Pea
- Old Farmer's Almanac: Sweet Pea
- Data as of: 2026-07-10
- Container sizes and timings are guidance — adjust to your climate/USDA zone and balcony aspect.