Loading the garden guide…
SeedStepsYour vegetable garden, one step at a time.My gardenRumba has a British variety profile with round yellow-brown bulbs. Learn to read a comparison with Sturon carefully, then follow your own row, maturity and storage quality.
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
This growing advice helps you choose. Your variety, growth stage, weather and conditions in your space determine the actual timing.
Start under cover in a cool, bright position · Onion
February–March for seed-grown onionsSow lightly in modules or a seed tray and grow on steadily.
Onion sets and seed-grown onions are different starting routes. Bunching and spring onions are generally harvested young.
Royal Horticultural Society · RHS — ui kweken ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
University of Minnesota Extension · UMN Extension — ui in de moestuin ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
Guideline periods for the Netherlands and Flanders. Check the variety, available light, soil and measured temperatures. Greenhouse heating does not guarantee enough winter light.
The source context and any limitations are in the background information at the bottom.
Compare with another varietyThe options below belong to the plant. From these, choose the method that suits your variety's growth habit.
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Small planting bulbs make an accessible start. The tip stays visible and the root base gets loose soil.
For a simple start and a batch of storage onions.
Tick off your supplies →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Sowing opens more choice but needs time for young shoots. Start timing must suit variety and intended planting position.
For anyone following the whole process with a suitable seed-grown variety.
Tick off your supplies →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Onions can grow in a broad container if every bulb has enough room. A container makes weeding easy but needs more frequent moisture checks.
For a sunny balcony or patio and a limited stored crop.
Tick off your supplies →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Put onion sets into the soil root-end down. The bulb belongs in the soil; only the dry tip stays above the surface.
View your supplies →RHS describes round yellow-brown Rumba bulbs; growing guidance says medium onions. The profile mentions British development, adding context without inventing an introduction year. Label rows from the start to compare actual harvest shape and colour with the profile.
The RHS profile describes Rumba as improving on Sturon in growth, shape and storage. That remains a statement within that British source. It does not predict which cultivar performs better in your garden. To compare them yourself, record differences in planting material, location and care. Otherwise, two storage crates may tell you more about cultivation than cultivar.
Rumba's profile gives full sun and well-drained soil. Before planting, observe moving shade and post-rain puddles. Sites can look light in photos but shade later. Use British reference dimensions alongside actual row growth.
Onions root shallowly. During drought, examine reachable soil before watering and match care to findings. Two beds may differ the same day. Save observations beside rows so later Rumba comparisons retain context.
Weeds compete with young onions. Work regularly around shallow roots and bulbs. Short rounds also reveal uneven growth. Photograph striking differences with dates and site notes, creating progression rather than one lifting-day impression.
Natural yellowing and flopping signals storage-onion harvest transition. Do not bend manually. British profile months are no fixed Dutch or Flemish dates. Assess and lift gently, sorting damage so it does not unknowingly receive intact-storage treatment.
Curing links beds and stores. Papery skins, dry necks and roots indicate readiness; airflow helps. Protect from rain. For variety comparisons, record drying conditions too: keeping quality is hard to judge if batches were treated very differently.
During storage checks, use soft or sprouting onions first. Record quality progression and methods per batch. Good keeping does not mean every bulb lasts equally. Compare Rumba and Sturon source claims with personal crops without declaring universal winners from one season.
Tick what you already have. The extras depend on how you grow.
0 of 7 ticked off
Your ticks are saved in this browser.
SeedSteps editorial team · updated on 11 October 2026. The AI images illustrate species and practical growing situations; they do not prove an exact cultivar, observations from your own garden or yield.
Britse gewasadviezen worden gecombineerd met Nederlandse en Vlaamse informatie waar beschikbaar. Amerikaanse Extension-bronnen ondersteunen plantprincipes en herkenning; hun kalenderdata, lokale plaagdruk, bestrijdingsmiddelen en mestdoseringen worden niet rechtstreeks op Nederland of Vlaanderen toegepast. Vorst, bodemwarmte, standplaats en expliciete rasinformatie blijven de lokale controle. Commerciële bronnen onderbouwen uitsluitend benoemde ras- en plantkenmerken; zij zijn geen affiliate-aanbeveling.
Supporting evidence by chapter: Start with the bulb described by the source: Royal Horticultural Society, Royal Horticultural Society. A comparison in a profile is not your own trial: Royal Horticultural Society. Full sun follows the day across the bed: Royal Horticultural Society. A small root zone needs targeted attention: University of Minnesota Extension. Small rounds keep development visible: University of Minnesota Extension. Let the foliage determine when to investigate further: Royal Horticultural Society, Royal Horticultural Society. The storage crate starts at the drying place: Utah State University Extension, University of Minnesota Extension. Compare what remains usable: Utah State University Extension, Royal Horticultural Society.
Fruit shape: Round Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Fruit size: Medium-sized Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Height: 10-50 cm Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Light: Full sun Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Main colour: Yellow-brown Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Save: Stores well with suitable harvesting, drying and storage Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society
Width: 10-50 cm Britse RHS-beschrijving; broncontext geldt voor het rasportret, zonder lokale maat-, oogst- of bewaargarantie. Royal Horticultural Society