How to Grow Crocus sativus (Saffron Crocus)
Posted by Mr Middleton on 2nd Sep 2025
Planting Timing
- Best months: September
- Flowers appear in October–November, usually within 6–8 weeks of planting.
- Plant promptly after purchase — saffron corms do not like sitting around.
Soil Preparation & Drainage
- Requires well-drained, sandy or gritty soil.
- Raised beds or pots are ideal in damp Irish gardens.
- Work in a little lime if soil is acidic — saffron prefers neutral to slightly alkaline ground.
Depths & Spacing
- Depth: 10–15cm deep
- Spacing: 10–12cm apart
- Plant in groups of 15–20 corms for a usable harvest.
- In pots: use a free-draining mix (2 parts compost, 1 part grit/sand).
Variety & Flowering
- Only Crocus sativus produces saffron threads.
- Blooms are lilac-purple with three vivid red stigmas — these are harvested as saffron.
- Flowers last only a few days, so daily checking is essential.
Harvesting & Cooking Value
- Each flower produces 3 stigmas.
- Harvest by hand early in the morning as blooms open.
- Dry stigmas on paper in a warm, dry room for several days.
- Store in a dark, airtight container — flavour deepens after 1–2 months.
- It takes about 150 flowers to yield 1 gram of saffron, which explains its reputation as the world’s most expensive spice.
Cooking uses:
- Adds golden colour and unique aroma to paella, risotto, bouillabaisse, and Persian rice dishes.
- Infuse threads in warm water or milk before adding to recipes to release maximum flavour and colour.
- Nothing beats the flavour of your own fresh harvested spice .
Naturalising Tips
- Prefers sunny, sheltered spots.
- Good for containers that can be kept drier in summer.
- In the ground, plant in sandy ridges or raised beds.
- Corms multiply each year if kept relatively dry in summer dormancy.
Pests & Problems
- Rodents: Mice and squirrels may dig up corms — use wire mesh protection if needed.
- Wet winters: Biggest risk — ensure very sharp drainage.
- Low yields: Normal in the first year; improve with feeding after flowering.
After-Care
- Allow foliage to grow over winter — it fuels the corms for next season.
- Feed lightly with potash-rich fertiliser after flowering.
- In pots: lift, dry and replant corms every 3–4 years.
- In beds: divide and replant crowded clumps in late summer.
This week’s action:
- Plant saffron corms in a sunny, free-draining spot by mid-September.
- Harvest red stigmas as blooms open in October–November.
- Dry and store threads to enjoy your own homegrown saffron in the kitchen this winter.