Dutch Crocus Bulbs Yellow Mammoth

Yellow Mammoth Dutch Crocus Bulbs

  • Yellow Dutch Crocus Bulbs Yellow Mammoth, Crocus flavus Yellow Mammoth, Yellow Mammoth Dutch Crocus Bulbs
  • Dutch Crocus Bulbs Yellow Mammoth

Yellow Mammoth Dutch Crocus bulbs bloom in early spring with a stunning display of bright yellow flowers.

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Regular Price: $11.49

Sale $9.76

per bag of 20 You save: 15%
Zones 3 - 9
Deer Resistant
Deer Resistant
Easy to grow
Good for Containers
Good Rockgarden or alpine plant
Grow in the Lawn
Light Requirements
Full Sun
Full Sun
Annual Rainfall
10 to 20", 20 to 30", 30 to 40", 40 to 50"
Bulb Spacing16 bulbs per sq. ft.
Bloom Time Early spring
Shipping Shipping begins in mid September, coldest zones first. Buy now and we'll ship your order at the ideal planting time for your region. Shipping for fall-planted bulbs will continue until they sell out or through December 31, 2016. Learn More…
Size Bag of 20


Yellow Mammoth Dutch Crocus Bulbs are large-flowered Dutch crocus that bloom in early spring with a stunning display of bright yellow flowers. An excellent naturalizing variety, 'Yellow Mammoth' Crocus is recommended to plant with miniature Iris and other early spring blooming bulbs in full sun.
Common Name Yellow Mammoth Dutch Crocus Bulbs
Botanical Name Crocus flavus Yellow Mammoth
Zones 3, 4, 5, 6, 7, 8, 9
Ships As Bulb, Rhizome, Tuber
Light Requirements Full Sun
Flower Color Yellow
Mature Height 4-6" tall
Bulb Size 9/10 cm
Bulb Spacing 16 bulbs per sq. ft.
Planting Depth Plant 3" deep
Bloom Time Early spring
Plant Type - Bulb Perennial
Planting Time Fall
Soil Type Average Soil, Compost Enriched Garden Loam Soil
Soil Moisture Average, Moist/Wet
Amount of Rain 10 to 20", 20 to 30", 30 to 40", 40 to 50"
Advantages Deer Resistant, Easy to grow, Good for Containers, Groundcover, Good Rockgarden or alpine plant, Grow in the Lawn
Ships to Hawaii, Alaska & Canada No

Planting Guides

Tips on Growing Fall Planted Flower Bulbs

When you receive your spring bulbs (tulips, daffodils, etc.) keep them in a dry, dark, cool place until ready to plant. They need air circulation so they will not collect moisture and rot. Planting times can vary from early October in the North to mid-to-late November in the southern regions. A good rule of thumb is to plant them about 6 weeks before the ground is frozen or after the first hard freeze. For more information and a planting depth illustration, see pages 14-16 of our Planting Guide.

Soil Preparation for Bulbs

A compost enriched, well-drained soil is best. Incorporate a good quality organic compost as needed. Yum Yum Mix® is recommended as an excellent source of nitrogen, phosphorus and potassium needed for strong plants and healthy roots. Mix a small amount into the bottom of the hole before planting your bulbs.

Many bulbs prefer full sun exposure. However, Muscaria, Allium, Galanthus, Hyacinthoides, Scilla and many Daffodils will tolerate partial shade and bloom well. Pink daffodils will hold their color longer if planted in dappled shade or morning sun/afternoon shade.

After planting, add a top dressing of compost or other organic material and water in thoroughly. If your winter is dry, water every three to four weeks throughout the winter and add more mulch if necessary.

Protect your Bulbs

Apply Chase Mole and Gopher Repellent to the surface of the ground to protect bulbs from these burrowing mammals. As bulbs sprout, use our Deer Off Repellent to prevent deer and rabbits from browsing your spring blooms.

After your Bulbs have Bloomed

Once your bulbs have bloomed, allow the bulb foliage to brown and fade naturally, since the leaves are feeding the bulb in the ground. Removal of foliage weakens the bulb and leads to fewer blooms the following year. Planting your bulbs amongst your perennials is one way to conceal the dying bulb foliage. The perennials begin to grow and fill out as the bulb foliage dies back. The perennials will then provide foliage and color in the garden from late spring through the summer and into fall. Regular fertilization with balanced organic or natural fertilizer and a re-application of mulch each fall will insure more and more beautiful spring bulb blooms for many years!

View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.


Plant & Bulb Shipping Buy now and we will ship your order at the ideal planting time for your region. Shipping begins Sept. 19. Amaryllis Bulbs will begin shipping mid-October 2016 and will continue until we sell out or through December 31, 2016.

Most plant and bulb orders arrive within 3-4 days, or less, of leaving our greenhouses. This prompt delivery is provided without additional express charges.

Grass Plugs & Seed: Most orders ship within 5-8 business days (all zones).

Gardening Goods: All non-plant items ship within 2-3 days.

Standard shipping costs are $4.99 and up, depending on the size of the order.

Make Fast Even Faster: For ‘Rush’ same week delivery, when possible, please call customer service at 800-925-9387.

More Shipping Info

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Q & A

USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

Find Your Planting Zone:

Enter your Zip Code to find your USDA Planting Zone

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