Species Crocus, Autumn Crocus, Fall Crocus

Crocusspeciosus

Family
Iridaceae (eye-rid-AY-see-ee)
Genus
Crocus (KROH-kus)
Species
speciosus (spee-see-OH-sus)
Synonym
Crocus multifidus
Sun Exposure
Full Sun
Sun to Partial Shade
Height
under 6 in. (15 cm)
Spacing
3-6 in. (7-15 cm)
6-9 in. (15-22 cm)
Hardiness
USDA Zone 3a: to -39.9 °C (-40 °F)
USDA Zone 3b: to -37.2 °C (-35 °F)
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
Danger
All parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction
Bloom Color
Blue-Violet
Lavender
Bloom Time
Mid Fall
Other Details
Category
Bulbs
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Blue-Green
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
Seed Collecting
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
Regional

This plant is said to grow outdoors in the following regions:

GARBERVILLE, California

Littleton, Colorado

Washington, Illinois

Olathe, Kansas

Thompsonville, Michigan

Croton On Hudson, New York

Ithaca, New York

New York City, New York

Wake Forest, North Carolina

Pembina, North Dakota

Fort Jennings, Ohio

Coos Bay, Oregon(2 reports)

Wilkes Barre, Pennsylvania

Broaddus, Texas

Spokane, Washington

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Gardener's Notes:

2
positives
2
neutrals
0
negative
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C
ROSLINDALE, MA | November 2015 | neutral

A beautiful addition to the garden, though their season of bloom is brief (under 2 weeks). Flowers tend to topple fairly quickly, like Co...Read More

T
Coos Bay, OR (Zone 8b) | November 2015 | positive

These are very reliable here in coastal oregon and naturalize well if left alone. Patches persist for many years. They are a harbinger of...Read More

K
K
L.A. (Canoga Park), CA (Zone 10a) | April 2005 | neutral

The flowers are so pretty but the plants don't last here very long. In a couple years they all die out.

P
(Zone 8a) | October 2002 | positive

An easy plant, welcomed for it's colour in the autumn.
It looks very good set off by russet fallen leaves.

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