Photo by Melody

PlantFiles: Dutch Crocus, Giant Crocus, Spring Crocus
Crocus x luteus 'Yellow Mammoth'

Family: Iridaceae (eye-rid-AY-see-ee) (Info)
Genus: Crocus (KROH-kus) (Info)
Species: x luteus
Cultivar: Yellow Mammoth
Additional cultivar information: (aka Golden Yellow, Dutch Yellow, Golden Mammoth, Large Yellow, Mammoth Yellow)

Synonym:Crocus x stellaris
Synonym:Crocus flavus

6 vendors have this plant for sale.

4 members have or want this plant for trade.

View this plant in a garden

Alpines and Rock Gardens

under 6 in. (15 cm)

3-6 in. (7-15 cm)

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)

Sun Exposure:
Sun to Partial Shade
Light Shade

All parts of plant are poisonous if ingested

Bloom Color:
Gold (Yellow-Orange)

Bloom Time:
Late Winter/Early Spring
Mid Winter


Other details:
Average Water Needs; Water regularly; do not overwater

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:

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

Click thumbnail
to view:

By naturepatch
Thumbnail #1 of Crocus x luteus by naturepatch

By Todd_Boland
Thumbnail #2 of Crocus x luteus by Todd_Boland

By dicentra63
Thumbnail #3 of Crocus x luteus by dicentra63

By bmuller
Thumbnail #4 of Crocus x luteus by bmuller

By Todd_Boland
Thumbnail #5 of Crocus x luteus by Todd_Boland

By David_Paul
Thumbnail #6 of Crocus x luteus by David_Paul

By ladychroe
Thumbnail #7 of Crocus x luteus by ladychroe

There are a total of 13 photos.
Click here to view them all!


3 positives
No neutrals
No negatives

Gardeners' Notes:

Positive JonthanJ On Mar 10, 2012, JonthanJ from Logansport, IN wrote:

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 warmer weather. Today, I found shoots from C. vernus budding. Yellow Mammoth give more flowers to a shoot as well, more like the snow crocus- also narrower leaves.

Positive ladychroe On Apr 15, 2008, ladychroe from Bridgewater, NJ wrote:

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 near the house so I can see them from the windows, but they can be seen all the way from the street, too.

Positive David_Paul On Mar 14, 2008, David_Paul from Clinton, CT (Zone 6b) wrote:

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

The Pacific bulb society writes of c. flavus "This is a wild, or typical, form of the commonly grown early spring yellow crocus. Usually seen in gardens in the larger sterile form 'Golden Yellow' (syn. 'Dutch Yellow', 'Yellow Mammoth')."


This plant has been said to grow 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

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