Shallots are the gourmet cousin of the onion: mild, sweet and far easier to store — and in Zone 12 they are a cool-season crop that needs a gentle start. They grow from sets or seed into clusters of small bulbs, and they need months of mild weather to size up before tropical heat pushes them to bolt or rot. This guide tells you exactly how to try: when to plant, how to start sets, what soil and spacing shallots need, how to water them, which neighbours help, which pests to watch, and when to harvest. Zone 12 is frost-free, with average winter lows of 50 to 60°F, so there is no last or first frost date to plan around — here you plant by heat and by the wet and dry seasons, not by frost. See the full planting calendar for the whole year, and check your local extension service for advice specific to your area.
Shallots at a glance in Zone 12
All figures below are broad published ranges from standard horticultural references, not exact figures for any variety or garden — they vary by variety, climate and soil. Use them to compare crops and to plan, not as promises.
| Detail | Shallots |
|---|---|
| Days to germinate | 7–14 |
| Days to maturity | 90–120 |
| Spacing (inches) | 6–8 |
| Soil pH | 6.0–7.0 |
| Sun | full sun |
| Sowing method | direct sow |
| Cold tolerance | hardy |
| Water needs | moderate |
When to plant shallots in Zone 12
Plant shallots at the start of the coolest months, roughly December in most Zone 12 areas, so they have the longest possible mild run. The published maturity range is 90–120 days, so a December planting matures as temperatures climb — which is why shallots are honestly a challenging crop here: heat can make bulbs bolt, and wet-season rain can rot them before they cure. Plant in the driest, best-drained part of the garden, and choose small sets rather than large ones, since large sets bolt more easily. Because the zone is frost-free, with winter lows of 50 to 60°F, there is no frost date to count from — plant by temperature, and check your local extension service for whether shallots are realistic in your exact area. Our December in Zone 12 guide shows what else to plant that month.
Starting shallots
Plant shallot sets directly in the bed: push each set into the soil so the tip just shows above the surface, with the pointed end up. Space sets 6–8 inches apart. Sets are far more reliable than seed in Zone 12, since seed germination takes 7–14 days and seedlings are slow. If you do sow seed, start it indoors or in a shaded nursery bed and transplant carefully. Water in after planting, then water sparingly until growth starts — wet soil before roots form invites rot. The plant spacing calculator helps you work out how many sets fit your bed.
Soil, spacing and sun
Shallots need light, well-drained soil with a soil pH of 6.0–7.0. Heavy or waterlogged soil is the enemy: bulbs rot in wet ground, so in tropical wet seasons a raised bed is almost essential. Dig in well-rotted compost, but avoid fresh manure, which encourages soft, disease-prone growth. Full sun suits shallots in the cool season. Keep the bed weed-free, since shallots have shallow roots and hate competition, and mulch lightly — but keep mulch away from the necks of the bulbs so they stay dry. Feed lightly; too much nitrogen produces leaves instead of bulbs.
Watering and feeding
Shallots need moderate water, and less is more once the bulbs start to swell. Water steadily while the plants are growing leaves, then reduce watering as the bulbs form — wet soil at that stage causes rot and poor storage. In the dry season, a deep soak once a week is usually enough. Stop watering altogether a few weeks before harvest so the bulbs can cure in the ground. Never water from overhead late in the day; wet necks invite disease in humid tropical air. If heavy rain is forecast near harvest, lift the bulbs early rather than letting them sit in wet soil.
Companion planting
Good companions for shallots are marigolds, basil, onions and lettuce. Lettuce can fill the gaps between young plants and shades the soil without competing deeply. Marigolds at the bed edges may help with soil pests. Basil is a useful general companion. Avoid planting shallots next to beans or peas, which do not grow well together, and do not follow shallots with onions, leeks or garlic in the same bed — rotate to a different family next season. For another quick allium from the same season, see our guide to Scallions in Zone 12.
Pests and problems
Watch for aphids, slugs and cutworms. Aphids cluster on tender new growth and can be washed off with water. Slugs love damp mulch around shallots — check at night and remove them by hand. Cutworms sever young shoots at soil level; collars help. Onion fly maggots can attack the bulbs, so cover young plants with fine insect mesh if it is a problem in your area. The biggest threat in Zone 12 is not insects but rot: wet soil and humid air cause neck rot and bulb rot, so drainage and airflow matter more than spraying. Remove and destroy any rotting bulbs at once.
Harvest and storage
Harvest shallots when the leaves yellow and fall over, usually within the published maturity range of 90–120 days from planting. Lift the whole cluster gently with a fork, separate the bulbs, and leave them to dry in a warm, airy, shaded place for a week or two until the skins are papery. Do not leave them in wet soil once the leaves have died back. Trim the roots and tops, and store in a cool, dry, well-ventilated place — in a mesh bag or braided — where they keep for months. Shallots are at their sweetest after a few weeks of curing.
Frequently asked questions
Can shallots grow in Zone 12?
They can, in the coolest, driest months, but they are challenging. They need 90–120 mild days and hate wet soil. Plant in December in a raised bed with excellent drainage.
Should I grow shallots from seed or sets?
Sets, in Zone 12. Seed germination takes 7–14 days and seedlings are slow, while sets establish fast and are far more reliable.
Why did my shallots rot?
Almost always wet soil. Shallots need sharp drainage, especially as bulbs swell and near harvest. Use a raised bed, reduce watering late in the season, and lift early if heavy rain is coming.
How do I store shallots?
Cure them for one to two weeks in a warm, airy, shaded place until the skins are papery, then store in a cool, dry, ventilated spot in a mesh bag. Properly cured shallots keep for months.