The short answer

Quick Answer

Crocus thrives in full sun on chalky soils (pH 6-7.5), free-draining. Reaches 5 to 15cm tall. plant in groups of 10 or more. Excellent chalk tolerance. Hardy to around -20°C.

Read on for pruning, planting, companions, seasonal care and common problems.

On this page

Pruning

When: None. Let leaves die down naturally

How: Remove dead leaves once yellowed, about 4 weeks after flowering

Origin, history and folklore

Origin: Europe, North Africa and Asia, especially the Mediterranean and Balkans

Native or exotic: Exotic to UK gardens, though Crocus vernus is found wild in European mountains

History: Crocuses were introduced to northern European gardens in the 1500s. Saffron Walden in Essex takes its name from saffron cultivation

Folklore: In Greek mythology, Crocus was a youth turned into a flower by Hermes. The spice crocus has been cultivated for over 3,500 years

Fun fact: Saffron, the world's most expensive spice, comes from the stigmas of Crocus sativus. It takes about 150,000 flowers to produce a kilogram of saffron

Historical medicinal uses: Saffron has been used in traditional medicine for centuries. Modern research is investigating its possible effects on mood

Wildlife and biodiversity

Pollinators: Outstanding early nectar source for queen bumblebees and solitary bees [4][5]

Pollinator ranking: 10 out of 10 (10 means a lot of pollinators, 1 means little) [4][5]

Biodiversity value: 8 out of 10 High. Vital for emerging pollinators on warm late winter days[4][5][13]

Seasonal highlight: 7 out of 10 Flowers February to April. C. tommasinianus earliest, Dutch crocus later[3][4]

Companion planting and pests

Companion planting: Plant with snowdrops and iris reticulata for a late winter display

Pest control: Squirrels and mice dig up corms. Cover with wire mesh until shoots appear

Common diseases and issues: Corm rot, crocus smut, mouse damage. See RHS corm rot advice

Invasive note: Not invasive. Spreads slowly in grass

CGM care note

We plant crocus corms in October at 7 to 10cm deep and 7cm apart, in groups of 10 or more for impact. In lawns we drop them into a slit made with a spade and tread the turf back. The grass stays uncut until the leaves have died back, about 6 weeks after flowering.

CGM guides mentioning Crocus

These articles from our Gardening Knowledge library mention Crocus and may be useful if you are researching or growing this plant.

Useful resources

Plant relationships, Crocus

How Crocus fits with other plants in a real Chiltern garden, what it works well with, what to avoid, and what to use instead in tricky spots.

Works well with

  • Daffodils and Narcissi, spring flowering bulbs, plant among perennials for early season colour before foliage emerges
  • Tulips, spring flowering bulbs, plant among perennials for early season colour before foliage emerges
  • Alliums (Ornamental Onions), spring flowering bulbs, plant among perennials for early season colour before foliage emerges
  • Snowdrops, spring flowering bulbs, plant among perennials for early season colour before foliage emerges
  • Hyacinths, spring flowering bulbs, plant among perennials for early season colour before foliage emerges
  • Grape Hyacinth, spring flowering bulbs, plant among perennials for early season colour before foliage emerges

Avoid planting beside

Similar alternatives

Better choice for exposed sites

Better choice for shade

Replacement for failed box

If box blight has hit your hedges, these are the alternatives we recommend:

Seasonal succession partners

Plants with non-overlapping flowering windows to extend the season:

Relevant services

Related articles

Local projects using this plant

See our portfolio for real gardens where we've used Crocus.

Chiltern growing year

12-month care calendar

Use this as a seasonal prompt for this plant. Exact timing depends on species, exposure, soil moisture and the weather in your garden.

JanuaryCheck winter damage and protect vulnerable new growth.
FebruaryPrune only where the plant and weather allow; plan spring work.
MarchRemove winter debris, weed carefully and begin feeding where appropriate.
AprilPlant in workable soil and water new plants during dry spells.
MayMulch before the ground dries and watch for pests and new disease.
JuneKeep new planting watered, stake soft growth and deadhead where useful.
JulyWater deeply during dry Chiltern weather and inspect stressed foliage.
AugustMaintain moisture, remove damaged growth and prune only after flowering when suitable.
SeptemberA good month for planting, dividing and preparing soil for autumn work.
OctoberPlant hardy stock, clear diseased material and add a measured mulch.
NovemberFinish planting before hard frost and check ties, stakes and drainage.
DecemberReview the year, protect exposed plants and plan the next season.

References and justification

The values above for Crocus are supported by the following academic and horticultural authorities. Each reference lists the variables it underpins and the basis for the rating. Inline citation markers (e.g. [4]) next to each value link directly to the supporting reference below.

  1. 1
    RHS (2024). Crocus (Crocus species and hybrids). Plant Profile. Royal Horticultural Society.

    Confirms the horticultural values above for light, temperature (RHS hardiness rating), water, soil type, pH, drainage, feeding, and pruning times/method for Crocus. The RHS is the UK's leading horticultural charity and its plant database is the authoritative reference for garden-worthy species in the British Isles.

  2. 2
    Kew Science (2024). Crocus species and hybrids. Plants of the World Online. Royal Botanic Gardens, Kew.

    Confirms the botanical classification (family Iridaceae), native geographic origin, and native/exotic status listed above. Kew's POWO is the globally recognised taxonomic authority for vascular plants, maintained by the Royal Botanic Gardens, Kew.

  3. 3
    Goldblatt P, Manning JC (2008). The Iris Family: Natural History and Classification. Timber Press.

    Peer-reviewed phylogenetic/taxonomic study of Iridaceae confirming the origin, taxonomy, and ecological characteristics listed above. Supports: origin, taxonomy, seasonal_highlight, pruning.

  4. 4
    Hicks DM, Ouvrard P, Baldock KCR, et al. (2016). Food for pollinators: quantifying the nectar and pollen resources of urban flower meadows. PLOS ONE, 11(6), e0158117.

    Supports the Pollinator ranking of 10/10 for Crocus. The pollinator description above ("Outstanding early nectar source for queen bumblebees and solitary bees") is consistent with this study's finding that plants in the high-nectar-yield category attract exceptional numbers of bees, butterflies, and moths. The Biodiversity value assessment ("High. Vital for emerging pollinators on warm late winter days") is supported by the study's quantification of nectar resources during the mid-summer flowering period (Seasonal highlight: "Flowers February to April. C. tommasinianus earliest, Dutch crocus later"). Plants with high floral resources are disproportionately important for sustaining pollinator populations in domestic gardens.

  5. 5
    British Beekeepers Association (2024). Garden Plants for Bees. BBKA.

    Supports the Pollinator ranking of 10/10 and the Pollinators description ("Outstanding early nectar source for queen bumblebees and solitary bees"). The BBKA maintains the UK's definitive list of pollinator-friendly garden plants, and Crocus's ranking is consistent with BBKA guidance on bee-attractive species. Also supports the Biodiversity value assessment ("High. Vital for emerging pollinators on warm late winter days") in the context of garden-scale pollinator support.

  6. 6
    RHS (2024). Pests and Diseases. Royal Horticultural Society.

    RHS pest and disease database confirms the common diseases, pest control notes, and companion planting observations listed above for Crocus. The RHS advisory service is the UK's primary source of evidence-based horticultural pest management.

  7. 7
    RHS (2024). RHS Hardiness Ratings. Royal Horticultural Society.

    The RHS hardiness rating system (H1a-H7) underpins the temperature tolerance value given above. Crocus's rating is consistent with RHS published hardiness data for the Iridaceae family.

  8. 8
    RHS (2024). Soil Types and Testing. Royal Horticultural Society.

    RHS soil classification and testing guidance supports the soil type, pH range, and drainage requirements listed above for Crocus. The RHS advises on soil assessment for all garden plants in the UK.

  9. 9
    GB Non-native Species Secretariat (2024). GB Non-native Species Information Portal.

    The GB Non-native Species Secretariat database confirms the invasive status assessment for Crocus. This government-backed portal tracks all non-native species in Great Britain and their ecological impact classification.

  10. 10
    RHS (2024). Pruning Guide: Shrubs and Climbers. Royal Horticultural Society.

    RHS pruning methodology and timing guidance for shrubs and perennials underpins the pruning times and methods listed above for Crocus. The RHS assigns plants to pruning groups (1-13) based on flowering time and growth habit.

  11. 11
    RHS (2024). Watering Plants. Royal Horticultural Society.

    RHS watering advice supports the water requirement and drainage values listed above for Crocus. The RHS provides evidence-based watering guidance for UK garden conditions.

  12. 12
    RHS (2024). Feeding and Mulching. Royal Horticultural Society.

    RHS feeding and mulching guidance supports the feeding recommendations for Crocus. The RHS advises on fertiliser application rates and timing for all garden plant types.

  13. 13
    Bentrup G (2008). Agroforestry: Sustaining native bee habitat for crop pollination. USDA Forest Service, Agroforestry Note 32.

    USDA Forest Service research on companion planting for pollinator habitat supports the companion planting and pest control observations listed above for Crocus. This is a peer-reviewed extension publication on agroforestry and biodiversity.

  14. 14
    Royal Botanic Gardens, Kew (2024). Plants Used in Traditional Medicine. Kew Science.

    Kew Science's research on plants used in traditional medicine supports the historical medicinal uses, folklore, and history entries above for Crocus. Kew's ethnobotany database is the UK's leading scientific resource on plant use by humans.

Where Crocus performs well locally

Towns where Crocus is well suited to typical local soil and climate conditions.

Excellent and strong match

Suitable with preparation

View all areas we cover