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Quick Facts
- Sowing window
- Sow direct from March to August, with protected sowings earlier or later.
- Harvest window
- Harvest young from May onwards when stems are pencil thick.
- Difficulty
- Easy to moderate
- Container suitability
- Use a trough at least 15cm deep and sow short rows 2–3cm apart. Spring onions are one of the most reliable balcony crops and can be succession-sown.
- Frost sensitivity
- Generally hardy
- Typical time to harvest
- Harvest slender stems about 8–12 weeks after sowing.
SOW
When to Sow Spring Onion White Lisbon in the UK
Sow direct from March to August, with protected sowings earlier or later.
Use that window as a practical starting point rather than a fixed deadline. In colder or exposed areas, delay outdoor sowing and planting; in mild sheltered areas, the earlier end of the range may work. Tender crops should remain protected until frost risk has passed.
Sowing Indoors
Early bulb onions and leeks can be sown in modules under cover. Give seedlings maximum light and plant out once sturdy; spring onions are normally simpler sown direct.
Sowing Outdoors
Sow Spring Onion White Lisbon thinly in prepared soil or its final container. Keep the seedbed weed-free because fine young allium leaves compete poorly.
PLANT
Spacing and Planting Out
Thin or sow to 2–3cm apart for slim stems.
Before planting outside, harden off indoor-raised plants over 7–10 days unless the crop is fully hardy and already accustomed to outdoor conditions. Water the planting hole or container first and avoid leaving young roots exposed to sun or wind.
SMALL SPACES
Growing Spring Onion White Lisbon in Pots and Containers
Use a trough at least 15cm deep and sow short rows 2–3cm apart. Spring onions are one of the most reliable balcony crops and can be succession-sown.
Container checklist
- Use drainage holes and raise pots slightly so surplus water can escape.
- Fill with fresh peat-free compost suited to edible crops.
- Leave a watering lip below the rim and check pots more often in sun or wind.
- Use a strong support at planting time if the mature crop will climb or become top-heavy.
CARE
Watering and Feeding
Water during dry spells while plants are actively growing, then reduce water as bulb onions mature. Avoid heavy nitrogen feeding late in the season because soft growth stores poorly.
Variety note: Repeat sow every three weeks for a steady supply and water during dry spells.
WATCH FOR
Common Problems
Allium leaf miner
Cover crops with fine insect mesh during adult flight periods and do not leave gaps at soil level.
Onion fly
Wilting seedlings can indicate maggots at the roots. Rotate crops and remove affected plants.
Rust
Orange pustules spread in crowded, damp foliage. Improve spacing and avoid excessive nitrogen.
PICK
Harvesting Spring Onion White Lisbon
Harvest young from May onwards when stems are pencil thick.
Harvest slender stems about 8–12 weeks after sowing. Harvest in the coolest part of the day where practical and handle produce gently. Regular picking encourages continued cropping in fruiting and cut-and-come-again plants.
GROW TOGETHER
Companion Plants
Carrots, lettuce and beetroot can share a wide bed or nearby containers where spacing allows. Companion combinations are useful for planning, but mesh is more dependable against allium pests.
QUESTIONS
Frequently Asked Questions
Can I grow Spring Onion White Lisbon in pots?
Use a trough at least 15cm deep and sow short rows 2–3cm apart. Spring onions are one of the most reliable balcony crops and can be succession-sown.
How long does Spring Onion White Lisbon take to harvest?
Harvest slender stems about 8–12 weeks after sowing.
Why are my Spring Onion White Lisbon seedlings falling over?
Weak light, crowded sowing, overwatering or damping-off can all weaken seedlings. Increase light and airflow and water from below when possible.