Crocus Bulbs – ‘Yellow Mammoth’

This striking variety produces large, cup-shaped flowers in brilliant yellow, opening in the sunshine above slender green foliage. Its vibrant blooms create a welcoming display when much of the garden is still waking up.

Flowering in early spring, ‘Yellow Mammoth’ is ideal for naturalizing in lawns, brightening rock gardens, lining pathways, and adding colour to patio containers. Its compact growth and hardy nature make it an excellent choice for planting in groups, where the golden flowers can return year after year in suitable growing conditions.

Why You'll Like It

Brilliant Golden Blooms: Large, sunny yellow flowers bring warmth and cheerful colour to early spring gardens.

Early Season Colour: Flowers near the end of winter, providing a welcome splash of colour before most spring plants emerge.

Compact Growth: Its petite size makes it perfect for rock gardens, pathway edges, and smaller planting spaces.

Naturalizing Potential: Hardy corms can multiply over time, creating increasingly colourful displays in suitable garden locations.

Plant Details

Botanical Name: Crocus flavus ‘Yellow Mammoth’
Common Name: Yellow Mammoth Crocus
Plant Type: Spring-flowering perennial corm
Flower Colour: Bright golden yellow
Flower Type: Large, cup-shaped blooms
Bloom Time: Early spring, depending on climate and planting conditions
Established Height: Approximately 8–12 cm (3–5 inches)
Light: Full sun to partial shade
Planting Depth: Approximately 8–10 cm (3–4 inches)
Plant Spacing: Approximately 5–8 cm (2–3 inches) apart
Soil: Well-drained soil
Maintenance Level: Low
Frost Tolerance: Hardy; well suited to cold winter conditions
Pet Friendly: Avoid ingestion; crocuses should not be eaten. Autumn-flowering meadow saffron (Colchicum) is highly toxic and is not a true crocus.

Growing Information

Light Requirements: Plant in full sun for the best flowering, although partial shade is also suitable, particularly beneath deciduous trees.

Watering: Water after planting and during active growth as needed. Avoid waterlogged soil, which can cause corms to rot.

Planting: Plant corms in fall, approximately 8–10 cm deep and 5–8 cm apart, in well-drained soil. Plant in informal groups for a natural-looking display.

Maintenance: Remove faded flowers if desired, but leave foliage intact until it yellows naturally so the corms can replenish their energy.

Long-Term Care: Allow foliage to die back completely before removing it. Established crocuses can multiply over time and return each spring in suitable growing conditions.

Great For

Spring Garden Beds • Rock Gardens • Garden Borders • Lawn Naturalizing • Patio Containers • Early Spring Colour