Ornithogalum dubium – Yellow, commonly known as Star of Bethlehem or Yellow Orange Star, is a striking spring-flowering bulb producing clusters of bright golden-yellow flowers with contrasting greenish centres. The neat, star-shaped blooms are carried above fresh green foliage, creating a vibrant display during April and May.

Growing to approximately 20-30cm tall, this compact South African bulb is particularly well suited to sunny containers and patio pots, where its vivid flowers can be appreciated at close range. It can also be grown outdoors in a warm, sheltered position with excellent drainage, although protection from frost and excessive winter wet is advisable in the UK.

• Botanical name: Ornithogalum dubium – Yellow
• Common name: Star of Bethlehem / Yellow Orange Star
• Plant type: Bulbous perennial
• Flower colour: Bright golden yellow with greenish centres
• Flowering time: April-May
• Height: Approximately 20-30cm
• Spread: Approximately 15-20cm
• Position: Full sun
• Soil: Fertile, very well-drained soil or compost
• Hardiness: Tender to frost; best protected in winter
• Ideal for: Pots, patio containers, conservatories and sheltered sunny borders

About Yellow Ornithogalum dubium

Ornithogalum dubium originates from South Africa and is unusual within the genus for its brightly coloured flowers. While many Star of Bethlehem species produce white blooms, this yellow form offers a much warmer display, with numerous golden flowers opening together on upright stems.

Each bloom has six broad tepals arranged into a clean star shape. The golden-yellow petals surround a subtly darker or greenish centre, giving the flowers added definition. The combination of compact growth and intense colour makes this an excellent choice for bright spring container displays.

Flowering in April and May

The flowers usually appear during April and May, rising above the foliage in clusters. Because several flowers open on each stem, even a small group of bulbs can create a generous display.

Planting several bulbs together is particularly effective. Their rich yellow colouring looks excellent alongside blue and purple spring flowers or against the simple green foliage of neighbouring plants.

Where to Grow Ornithogalum dubium

Choose a warm, sunny position with very good drainage. Plenty of direct light will encourage strong growth and the best flower colour.

In the UK, growing Ornithogalum dubium in pots is often the most practical approach. Containers can be displayed outside during mild weather and moved somewhere frost-free when conditions become colder or excessively wet.

A bright conservatory, greenhouse or sheltered windowsill can also provide suitable conditions.

How to Plant Ornithogalum dubium Bulbs

Plant the bulbs approximately 5-8cm deep with the pointed growing tip facing upwards. Allow around 10-15cm between bulbs in the garden, or plant slightly closer together in containers for a fuller effect.

Use a fertile but free-draining compost. Adding horticultural grit can help maintain sharp drainage, particularly if the bulbs will remain in their pots throughout winter.

Height and Spread

Yellow Ornithogalum dubium typically grows to around 20-30cm tall with a mature spread of approximately 15-20cm. Its compact habit makes it suitable for relatively small containers as well as mixed patio displays.

Growing in Containers

This species makes an excellent pot plant. Choose a container with unrestricted drainage holes and keep it somewhere bright and sunny while actively growing.

Water when the compost begins to dry, but avoid leaving the bulb standing in permanently wet soil. Good drainage is one of the most important factors when growing Ornithogalum dubium successfully.

After Flowering and Winter Care

Once flowering has finished, allow the foliage to remain until it naturally yellows and dies back. The green leaves continue feeding the bulb and help build up reserves for its next growth cycle.

As the bulb becomes dormant, gradually reduce watering. Because Ornithogalum dubium is not reliably hardy through UK winters, bulbs are safest kept frost-free and comparatively dry during cold weather.

Why Grow Yellow Ornithogalum dubium?

• Brilliant golden-yellow flowers
• Attractive greenish flower centres
• Flowers during April and May
• Compact growth to 20-30cm
• Spread of approximately 15-20cm
• Excellent for sunny containers
• Ideal for conservatories and sheltered patios
• An unusual yellow alternative to the more familiar orange form
• Produces generous clusters of star-shaped blooms

Frequently Asked Questions

When does yellow Ornithogalum dubium flower?
It normally flowers during April and May.

How tall does it grow?
Plants typically reach approximately 20-30cm tall.

What is the spread of Ornithogalum dubium?
An established plant usually spreads to around 15-20cm.

Does Ornithogalum dubium need full sun?
Yes. A warm, sunny position is ideal and encourages strong growth and flowering.

Can it be grown in pots?
Yes. Container cultivation is particularly suitable and makes it much easier to protect the bulbs from frost and excessive winter wet.

Is Ornithogalum dubium hardy in the UK?
It is not reliably frost hardy. For dependable results, protect the bulbs during winter in a frost-free greenhouse, conservatory or similarly sheltered position.

Should I cut back the leaves after flowering?
No. Allow the foliage to yellow and die back naturally so that it can replenish the bulb before dormancy.

With its bright golden-yellow star-shaped flowers, compact habit and strong spring colour, yellow Ornithogalum dubium is an excellent choice for sunny pots, patios and protected garden positions.