Euphorbia glauca, also known as the sea spurge or shore spurge, is a captivating native perennial that has gained popularity among New Zealand gardeners due to its unique appearance and adaptability. It is well-known for its attractive, blue-grey foliage, and produces small red/pink flowers September to March. Grows to approx. 2m wide x 1m tall.
 
Watering
Euphorbia glauca is a drought-tolerant plant that prefers well-draining soil. While it can withstand periods of dryness, it's essential to provide regular watering during the growing season, particularly in hot, dry conditions. However, avoid overwatering, as it is susceptible to root rot in waterlogged soil.
 
Feeding
Fertilise Euphorbia glauca sparingly during the growing season with a balanced, all-purpose fertiliser. Apply the fertiliser in spring when the plant is actively growing. Excessive fertilisation can lead to leggy growth, so be cautious not to overfeed.
 
Pruning
Pruning Euphorbia glauca is generally not necessary, as it maintains a neat and compact shape naturally. However, if you wish to control its size or remove any dead or damaged growth, trim it back in late winter or early spring.
 
Overwintering
Euphorbia glauca is generally hardy, and it can withstand mild frosts. In colder regions, consider protecting the plant with a layer of mulch during winter to ensure its survival. Avoid excessive moisture during the winter months to prevent rot.
 
Birds & Bees
The inconspicuous red/pink flowers provide a valuable food source for pollinators, such as bees and other beneficial insects. Its presence in your garden can attract these important visitors, contributing to a healthy ecosystem.
 
Location
it can be successfully grown in gardens, rockeries, and coastal areas with well-drained soil and full sun to partial shade. It's an ideal choice for xeriscaping, as it can tolerate dry conditions.
 
Propagation
Euphorbia glauca can be propagated from seeds or by taking stem cuttings. Sow seeds in spring or take cuttings in early summer. Make sure the soil is well-draining, and keep the young plants moist until they establish themselves.
 
Diseases
Euphorbia glauca is generally disease-resistant, but it can be susceptible to root rot if the soil remains consistently wet. To prevent this, ensure proper drainage and avoid overwatering.
 
Insects & Pests
Euphorbia glauca is relatively pest-resistant, but like many other Euphorbia species, it can produce a milky sap that may irritate the skin. Wear gloves when handling the plant to protect yourself from this sap.
 
Substitutes
If you're looking for substitutes for Euphorbia glauca in your garden, you might consider other low-maintenance perennials with striking foliage, such as Sedum spectabile (stonecrop), Heuchera (coral bells), or Festuca glauca (blue fescue).
 
Plants to Pair With
Euphorbia glauca pairs beautifully with a variety of plants in your garden. Some excellent companion plants include lavender, Echinacea (coneflowers), and ornamental grasses. These combinations create a harmonious garden landscape with contrasting textures and colours.