Mrs Robb's Bonnet

Mrs Robb’s Bonnet, or Euphorbia robbiae, is a tough, evergreen perennial known for its bold, glossy evergreen foliage and vibrant lime-green flowers in spring. Ideal for dry shade and difficult areas, it forms reliable ground cover beneath trees and shrubs.

Providing seasonal care is essential to maintain its tidy appearance, healthy growth, and long-term performance. Below is a complete seasonal care guide for Mrs Robb’s Bonnet throughout the year.

Spring

Pruning and Maintenance

In spring, cut back spent flowering stems to the base once the lime-green bracts begin to fade using clean, sharp secateurs. This encourages fresh foliage growth and keeps the plant tidy. Wear gloves when pruning, as the milky sap can irritate skin.

Feed

Apply a light dressing of compost or a balanced, slow-release fertiliser in spring. Euphorbia robbiae prefers moderately fertile soil and does not require heavy feeding.

Dividing (if necessary)

Mrs Robb’s Bonnet rarely needs dividing, but if clumps become too large or spread excessively, they can be reduced in spring. Lift carefully and replant sections into well-drained soil.

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Water during prolonged dry spells in spring, especially for newly planted specimens. Once established, watering requirements are minimal.

Summer

Pruning and Maintenance

Little maintenance is required in summer. Remove any damaged or yellowing leaves if needed to maintain a neat appearance.

Mulching

Apply a 2 to 3-inch layer of organic mulch around the base of the plant to suppress weeds and help retain moisture, particularly in newly planted areas.

Watering

Euphorbia robbiae is drought-tolerant once established. Water only during extended periods of drought, allowing the soil to dry out between waterings.

Autumn

Pruning and Maintenance

Minimal pruning is required in autumn. Remove any dead or damaged foliage if necessary, but avoid cutting the plant back hard at this time.

Protection from frost

No special frost protection is generally required, but a light mulch can help protect roots and improve soil structure.

Winter

Pruning and Maintenance

Avoid pruning during winter. The evergreen foliage provides protection for the crown and maintains ground cover through the colder months.

Protection from frost

Mrs Robb’s Bonnet is fully hardy and tolerates winter conditions well. Ensure good drainage to prevent damage caused by winter wet.

Pest and disease prevention

Pests and diseases are rarely a problem, but inspect occasionally for signs of rot in poorly drained soil and remove any affected growth promptly.

Plant SOS

Yellowing leaves – A sign of waterlogged soil. Improve drainage and reduce watering.

Sparse growth – A sign of deep shade or poor establishment. Allow time to settle or improve light levels if possible.

Floppy stems – A sign of overly rich soil. Reduce feeding and avoid excessive fertiliser.

Leaf scorch – A sign of sudden exposure to strong sun. Provide partial shade during establishment.

Excess spread – A sign the plant is very happy. Lift and reduce clumps in spring if control is needed.

Holes in leaves – A sign of slug and snail damage. Use Slug and Snail repellent or Slug and Snail control.