Dutch Crocus, Giant Crocus, Spring Crocus 'Yellow Mammoth'

Crocusx luteus

Family
Iridaceae (eye-rid-AY-see-ee)
Genus
Crocus (KROH-kus)
Synonym
Crocus x stellaris
Crocus flavus
Sun Exposure
Sun to Partial Shade
Light Shade
Foliage
Herbaceous
Good Fall Color
Height
under 6 in. (15 cm)
Spacing
3-6 in. (7-15 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)
Danger
All parts of plant are poisonous if ingested
Bloom Color
Gold (yellow-orange)
Bloom Time
Late Winter/Early Spring
Mid Winter
Other Details
Category
Alpines and Rock Gardens
Bulbs
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
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)
7.6 to 7.8 (mildly alkaline)
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

Clinton, Connecticut

Hawkinsville, Georgia

Logansport, Indiana

East Longmeadow, Massachusetts

Florence, Mississippi

Albuquerque, New Mexico

Akron, Ohio

Salt Lake City, Utah

Newport News, Virginia

Vancouver, Washington

show all

Featured Videos

Gardener's Notes:

3
positives
0
neutral
0
negative
Sort By:
Sort By:
J
Logansport, IN | March 2012 | positive

Today's show in my scree reminds me that these guys bloom just a little bit ahead of the Crocus vernus. These guys popped in last week's...Read More

L
Bridgewater, NJ | April 2008 | positive

This is one of the few crocus that, in my opinion, really have presence in the garden. Very bright and large-flowered. Mine are planted n...Read More

D
Clinton, CT (Zone 6b) | March 2008 | positive

Sold by Van Engelen as "Crocus flavus Yellow Mammoth".

The Pacific bulb society writes of c. flavus "This is a wild, or ...Read More

Featured
Yellow-spotted Millipede
(Harpaphe haydeniana)
Yellow-bellied Sapsucker
(Sphyrapicus varius)
Featured
Yellow-spotted Millipede
(Harpaphe haydeniana)
Yellow-bellied Sapsucker
(Sphyrapicus varius)