When to Harvest Vertus Onions—and How to Dry Them for Storage

Lifting an onion is satisfying. Finding it soft in the kitchen a few weeks later is less so. If you want to keep part of your harvest, the drying stage deserves as much attention as the growing.

This guide is for home gardeners raising Vertus OP onion seeds. AM Seeds lists Vertus as a pink onion in a 100g pack, with August–September nursery sowing and an approximate five-month crop period. Here is how to judge the harvest and handle the bulbs afterwards.

Keep the nursery date in perspective

August–September is the listed nursery window, rather than the time to harvest mature bulbs. Local conditions and seedling development determine the next steps. Record both sowing and transplanting dates so you know what a maturity estimate is being compared with.

The listed five months helps with planning, but it does not replace looking at the crop. Your plants may develop at a different pace from a photograph or a neighbour's onions.

If you are still at the seedling stage, our onion nursery guide explains the basic process. Its October–November dates belong to BolStar; keep Vertus's own nursery window when planning this variety.

What does a maturing onion look like?

As bulb onions mature, the necks soften and the tops begin to fall naturally. University of Minnesota Extension uses about half the tops falling over and drying as a home-garden harvest guide.

Inspect several plants rather than deciding from one bent leaf. Physical damage, weather or a plant problem can also affect foliage. Look for the general pattern across the crop and the condition of the bulbs.

Do not flatten healthy tops to force the appearance of maturity. Let the plants show their progress. If only a few onions look affected while the rest remain actively growing, investigate those plants separately.

Adjust watering as the crop matures

During growth, onions need adequate moisture. As bulbs reach full size and tops start to fall, the watering approach changes; the Minnesota guide advises stopping watering at that stage.

This does not mean withholding water as soon as you first notice a small bulb. Bulb growth and final maturity are different stages. Check the crop, soil and forecast instead of choosing a stop date months in advance.

For a garden bed after rain, wait until conditions allow careful lifting without smearing wet soil over the bulbs. Where prolonged wet weather threatens the harvest, ask for local advice on timing.

Lift without bruising

Prepare a shallow tray or basket before you start. Loosen the soil carefully with a fork, keeping the tool away from the bulbs, then lift them gently. Do not knock onions together to remove soil or drop them into a deep bucket.

Set visibly damaged bulbs aside from those intended for storage. Keep sound but nicked onions for prompt kitchen use after inspection; discard rotten bulbs.

Leave the tops attached while curing. A neat-looking onion is not necessarily a properly dried onion, and cutting a moist neck too early can create storage problems.

Give the harvest air and shelter

Curing means allowing the outer layers and neck to dry. Spread onions in a single layer in a dry, sheltered place with good airflow. Avoid sealing them in a plastic bag or leaving a dense heap in a closed box.

Seed Savers Exchange recommends a sheltered position away from direct sunlight for curing. This is useful in a home setup where strong sun or unexpected rain could damage exposed bulbs.

Use a clean rack or another surface that allows air around the crop. Check it regularly. If one part stays damp, improve the arrangement rather than simply leaving the onions there for longer.

How do you know curing is finished?

Look for dry, papery outer skins and a dry neck. Curing often takes a few weeks, but humidity and airflow affect the time. A bulb should not go into longer storage just because the calendar says the curing period is over.

Utah State University Extension explains why cutting through tops that are still green or moist can contribute to neck rot in storage. Wait until the neck is properly dry before trimming for storage.

Handle cured onions gently too. Keep the dry protective layers rather than peeling each bulb down to a clean kitchen finish.

Store a small amount, then keep checking

Choose a cool, dry, ventilated place and use containers that allow airflow. Keep batches identifiable so you can use older onions first. Check periodically for softness, sprouting or decay and remove affected bulbs.

Storage life depends on the variety, maturity, curing and conditions in your home. The Vertus listing does not establish a guaranteed storage duration, so do not plan on a fixed number of months.

If your home stays warm or humid, grow an amount you can use reasonably soon instead of relying on long storage. A smaller sound harvest is more useful than a large bag you cannot keep in good condition.

When planning the next season, view the Vertus OP onion pack and make room for both the growing bed and the curing space. The crop is not quite finished when it leaves the soil.