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Bulbs

Erythronium tuolumnense

Tuolumne dog's tooth violet

A perennial to 30cm, with rather glossy, wavy green leaves and stems bearing up to 4 nodding bright yellow flowers 4cm in width in spring

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0–0.1 metre

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

North–facing or West–facing or South–facing or East–facing

Exposure

Exposed or Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Liliaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Clump forming
Potentially harmful: Ornamental bulbs, not to be eaten. Wear gloves and other protective equipment when handling Pets: Ornamental bulbs, not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Erythronium are bulbous perennials with paired, ovate or broadly elliptic leaves, and leafless stems bearing one or more nodding, star-shaped flowers with recurved petals
Name status: Correct
Plant range: California

How to grow

Cultivation

Plant 10cm deep in fertile, humus-rich, well-drained soil in partial shade that does not dry out. Bulbs in storage must be kept slightly damp. See bulb cultivation

Propagation

Propagate by division after flowering

Suggested planting locations and garden types

Rock garden
Cottage and informal garden
Wildflower meadow
Underplanting of roses and shrubs
Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to slugs

Diseases

Generally disease-free

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