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How to Grow Saffron Crocus and Harvest Your Own Saffron
Saffron is the most expensive spice in the world by weight, and the plant that produces it is a crocus you can grow in a flower bed. Three tiny crimson stigmas per flower, a handful of flowers per square foot, and an autumn bloom that appears when almost nothing else is flowering.
What saffron crocus is — and is not
Crocus sativus is a fall-flowering crocus. It is not the spring crocus in your lawn, and it is not the autumn meadow crocus (Crocus speciosus) that looks similar but yields no spice. True saffron crocus is a cultivated plant that does not occur in the wild; every bulb you buy is a clone, and every bulb produces one to three flowers in October.
Planting
- When: late August to early September, so corms root before flowering.
- Depth: 4 inches deep, 3–4 inches apart, pointed end up.
- Site: full sun and sharply drained soil. This is the one requirement that matters — saffron corms rot in wet ground.
- Soil: add grit or coarse sand if your soil holds water. A raised bed or large pot is ideal.
In cold zones (3–5), plant in a container you can move into a cold frame or unheated garage for winter, or mulch heavily after flowering. Corms are hardy to about zone 6 in the ground; in pots they are exposed to deeper freezing.
The harvest
Flowers open at dawn and collapse within a day or two, so pick in the morning. Pinch the three red stigmas from each flower — the yellow styles have no value — and dry them on a sheet of paper in a warm, dark room for a few days, or dehydrate at low heat for 15 minutes. It takes roughly 150 flowers to make one gram of dried saffron, which is why the spice costs what it does.
Use the first year’s harvest for cooking rather than for seed stock. A well-established bed of 100 corms will give you a small jar each autumn.
The annual cycle
| Season | What happens | What to do |
|---|---|---|
| Late summer | Corms are dormant | Plant or divide |
| October | Flowers, then thin grass-like leaves | Harvest stigmas; no feeding |
| Winter–spring | Leaves photosynthesise | Leave foliage alone until it yellows |
| Early summer | Foliage dies back, corms multiply | Keep dry; lift and divide every 3–4 years |
Why corms fail to flower
Three causes dominate: corms too small to flower (below about 8cm circumference), a bed that stays wet through summer dormancy, and overcrowding. Lift clumps every three or four years after the leaves die down, break them apart, and replant only the largest corms — small ones need a season to size up.
Growing it as an ornamental
Even if you never harvest a thread, saffron crocus earns its place: violet flowers in October, tidy grass foliage in winter, and nothing needed in summer. Plant it at the front of a sunny border or in a gravel garden, where the drainage does half the work for you.
Our crocus corms ship in late summer, in time for planting. If you are not ready to plant on arrival, keep them cool and dry and read the storage notes in our FAQ.