How to Grow Saffron Crocus: Harvest Your Own Saffron

Saffron is the most expensive spice in the world by weight, and almost all of it comes from one small autumn-flowering crocus. Crocus sativus blooms in October and November, produces three crimson stigmas per flower, and then goes dormant until the following fall. There is no other plant quite like it in a garden.

The catch is scale. You will not grow saffron cheaply — a gram of the dried spice takes roughly 150 flowers, and a single corm produces only one or two flowers per season. What you get instead is something no shop can sell you: the first saffron of the year, picked by hand in your own garden on a cold morning, and a perennial that comes back and multiplies on its own.

First, the safety point

Three different plants get called “autumn crocus” and only one of them is edible.

• Crocus sativus — the saffron crocus. Flowers in autumn, lilac-purple, with three bright red stigmas. This is the edible one.
• Colchicum autumnale — meadow saffron. Also flowers in autumn, also looks like a crocus, and is highly toxic. It has six stamens and flowers on bare stems with no leaves attached.
• Spring crocuses — the ones in your lawn in March. Harmless, but they produce nothing worth harvesting.

If you are buying corms, buy from a supplier who names the species. If a plant is sold only as “autumn crocus” with no Latin name, walk away.

When to plant

Plant saffron corms in late August through September, roughly six to eight weeks before your first frost. Unlike spring bulbs, these do not need a cold period to trigger flowering — they flower on their own schedule in autumn, whether or not you have planted them yet.

This is why late planting still works. A corm dropped into the ground in early October will usually still flower that same season, just later and with less vigour. If you miss September entirely, plant anyway and treat the first year as establishment.

Site and soil

• Sun — full sun. Saffron flowers in autumn when the sun is already low, so a spot that is bright in October matters more than summer sun.
• Drainage — this is the one thing that kills saffron corms. They rot in wet soil over winter. Plant on a slight mound, in raised beds, or in a gritty mix if your soil holds water.
• Soil — light, sandy, slightly alkaline. Add sharp sand or grit to heavy clay before planting rather than after.
• Shelter — away from strong wind. Autumn flowers are top-heavy and snap easily.

How to plant

1. Work grit into the top few inches if your soil is heavy.
2. Set corms 3 to 4 inches deep and 3 to 4 inches apart, pointed end up.
3. Water once after planting, then leave them alone. Autumn rain usually does the rest.
4. Mark the spot. Saffron disappears completely in summer, and it is very easy to dig through a dormant patch in July.

Containers work well too, and they solve the drainage problem outright. Use a gritty free-draining mix and a pot deep enough for a 4-inch planting depth.

Flowering and harvest

Flowers open in October and November, usually over a two to three week window. Each one lasts a single day, so check the patch every morning during the season.

Pick the flowers early in the morning, before the sun has dried them. Then, indoors, pinch out the three red stigmas from each flower with your fingers or a pair of tweezers. Everything else — the purple petals, the yellow stamens — goes on the compost.

Drying and storing

Spread the stigmas on a sheet of paper in a warm, dark, well-ventilated room for a few days. They are ready when they feel dry and slightly brittle but still hold their colour.

Do not dry them in a hot oven. Saffron loses its aroma above roughly 90°F, and the whole point of growing your own is the aroma. Store the dried stigmas in a small airtight jar, in the dark, and use them within a year.

How much you actually get

Set expectations honestly:

• 1 flower = 3 stigmas
• Roughly 150 flowers = 1 gram of dried saffron
• A first-year planting of 50 corms might give you 50 to 80 flowers — about half a gram

That is still enough for several paellas or a batch of saffron rice. The volume grows as the corms multiply, which they do steadily once established.

Looking after it year to year

• Leave the foliage. After flowering, thin grass-like leaves appear and stay through winter and spring. They feed next year’s corms. Do not cut them until they yellow in late spring.
• Keep it dry in summer. Saffron is dormant from June to August and rots if watered during dormancy. This is the single most common reason plants fail in their second year.
• Divide every three to five years. Lift the clump in summer when it is dormant, separate the corms, and replant the largest ones. Crowded clumps flower poorly.
• Feed lightly in early spring while the leaves are growing, then stop.

Common problems

• Corms rot over winter — wet soil. Lift and replant into grit, or move to a raised bed.
• Leaves but no flowers — corms too small, or the clump is overcrowded. Small corms need a season or two to reach flowering size.
• Flowers appear but no leaves at all — normal. Saffron flowers on bare stems; leaves follow.
• Nothing comes up in autumn — check you were sold Crocus sativus and not a spring variety. Spring crocuses will not flower in October no matter how you plant them.

Ready to start

Our saffron crocus corms are sized for flowering in their first season — plant them in September and you should be picking stigmas within eight weeks.

For the ornamental side of the same genus, our guide to growing crocus covers the spring-flowering species and how to naturalise them in a lawn. If you are planting late, bulbs you can still plant in November explains what is worth putting in and what to hold over.

Every order ships with our 30-day arrive-alive guarantee — if a corm arrives soft or mouldy, we replace it.

Shop related: Saffron Crocus Corms – Grow Your Own Saffron Spice