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How to Grow Saffron Crocuses UK | Regional Planting Calendar
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RHS states corms are planted in late summer, with September acceptable -- taken here as roughly early August to mid-September.
Midlands - detail & sources
Same late-summer corm-planting window as elsewhere in the UK -- RHS rates saffron crocus H6, hardy across all of the UK, so timing does not shift meaningfully by region.
Northern England - detail & sources
Same late-summer corm-planting window, closing slightly earlier to give plants more time to establish before autumn flowering -- RHS's H6 rating means winter cold is not a limiting factor even this far north.
Scotland - detail & sources
Same late-summer corm-planting window, closing slightly earlier to give plants more time to establish before autumn flowering -- RHS's H6 rating means winter cold is not a limiting factor even this far north.
Rich but well-drained (RHS); NC State: loam with high organic matter and sand, good drainage, tolerates occasionally dry.
Lifecycle
Autumn-flowering perennial corm. RHS rates it H6, hardy across all of the UK and northern Europe (-20 to -15C). The flowers are sterile and set no seed -- the plant increases purely by cormlets.
RHS: plant corms in late summer (September acceptable), 10-15cm deep, ~10cm apart, in rich but well-drained soil in a bright, sunny site; water in well. NC State: plant ~4in apart and 4in deep in well-drained soil with moderate organic matter.
Autumn flowering
6
RHS: flowers typically appear in October, often a little later in the first year -- unusual among crocuses for flowering in autumn rather than spring. NC State: purple to lavender flowers appear for a 1-2 week fall bloom period, each corm producing 2-4 flowers; the harvest window is this same short period.
Winter foliage
3
RHS: plants reach around 30cm tall over winter as grass-like leaves develop after flowering. Both sources note the flowers themselves are sterile and set no seed -- all increase is via cormlets forming underground.
Dieback and dormancy
9
RHS: foliage dies back completely in late spring, leaving the corm dormant in the soil through summer until autumn growth resumes. RHS notes a corm may take two to three years to reach flowering size after being replaced by cormlets.
When to pick: RHS/NC State: use tweezers to pick the long red stigmas from the centre of each flower, avoiding the shorter, paler orange stamens; harvest through the 1-2 week autumn bloom. Roughly 150 flowers yield 1g of dried saffron.
Storage
Dry threads on a kitchen towel on a baking rack at room temperature for at least 24 hours, then store in an airtight container away from light (RHS).
Corm rot (saffron crocus, causal agent not yet confirmed)
low
RHS: corms may rot in storage. NC State independently names root rot in poorly drained planting sites -- a genuine corroboration that drainage is the key risk factor, both in the ground and in storage.
Named only vaguely by NC State ("fungal disease risk during wet blooming periods"), no species identified -- generic entry created rather than guessing a pathogen. RHS describes the plant as generally disease-free.
The long, drooping red stigmas are the part harvested for saffron -- RHS advises picking them out carefully with tweezers, avoiding the shorter, paler stamens.
RHS and NC State agree it takes around 150 flowers to yield just one gram of dried saffron -- the reason it remains the world's most expensive spice by weight.
A top-down view showing the lilac petals, orange anthers, and red stigmas together -- RHS notes the flowers are sterile and set no seed, so the plant spreads only by cormlets.
A single grass-like shoot emerging from bare soil in autumn -- RHS notes flowers typically follow in October, sometimes a little later in a corm's first year.
After flowering, narrow grass-like leaves persist through winter -- RHS notes plants reach about 30cm tall before dying back completely in late spring.
RHS describes saffron as "relatively easy to grow" despite its high market price -- a bed like this, planted from corms in late summer, needs little more than a sunny, free-draining spot.
Light: full sun (6+ hours). Soil: loam with high organic matter and sand, good drainage, tolerates occasionally dry conditions. Size: 6-10in height, 2-4in width. Hardiness: USDA zones 5a-8b; grown in Coastal, Piedmont and Mountain regions of NC. Propagation: division, corms multiply naturally each year. Planting: ~4in apart, 4in deep, well-drained soil with moderate organic matter. Pests/diseases: fungal disease risk during wet blooming periods; root rot possible in poorly drained sites; rodents (squirrels, mice) consume corms. Harvest: orange stigmas and styles harvested during the 1-2 week fall bloom, used fresh or dried and stored in sealed containers; flowers are edible and have historical medicinal use. Growth: medium rate, low maintenance, herbaceous perennial bulb.
Planting: late summer (September acceptable), 10-15cm deep, ~10cm apart, rich but well-drained soil, bright sunny site, water in well. Growing: flowers appear October (may be later year one), plants reach ~30cm tall over winter, die back late spring; flowers sterile, set no seed. Propagation: original corm replaced by cormlets, may take 2-3 years to flower. Harvest: tweezer out the long red stigmas, avoid the shorter orange stamens; ~150 flowers per gram of dried saffron. Drying: threads on a kitchen towel on a baking rack, room temperature, at least 24 hours until completely dry. Storage: airtight container away from light.
2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When should I sow saffron crocuses in the UK?
In Southern England, from early August. In Scotland, wait until early August. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow saffron crocuses?
Sow early August to mid September.
What problems affect saffron crocuses?
Our data links 2 diseases and 3 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
UK vegetable growing guides · Checked against RHS & Met Office guidance
Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.
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