Olearia macrodonta: complete guide

Overview

Olearia macrodonta, known as New Zealand holly, is an excellent hardy shrub from New Zealand with a distinctive appearance. This plant is valued for its large, characteristic leaves with deep teeth that resemble holly leaves, although it actually belongs to the Asteraceae family.

The plant grows into an attractive upright shrub and produces abundant white flowers in spring and autumn. With its grey-green foliage, it forms a wonderful background shrub in the garden.

Appearance and bloom

The leaves of Olearia macrodonta are large, glossy, and have deep teeth along the margins. The foliage has a characteristic grey-green color that contrasts with the dark stems. The flowers are small, white, and appear in dense clusters, making the plant particularly attractive in June and again in August.

After flowering, small seeds form that are dispersed by wind. The plant retains its leaves year-round, making it a valuable structural element in the winter garden.

Ideal location

Olearia macrodonta grows best in a position with full sun to partial shade. At least four hours of direct sun per day will encourage flowering and promote a more compact, healthy growth pattern. The plant tolerates shade but will grow less compactly.

The plant is beneficially positioned in windy areas because it resists wind well and can be very useful as a windbreak in exposed locations.

Soil

Olearia macrodonta is not fussy about soil but grows better in well-draining, fairly neutral to slightly acidic earth. Heavy clay soils can be improved with gravel and organic material. Avoid permanently wet locations.

If you're planting in a garden with frost-sensitive soil, add some gravel or shells to the planting hole to prevent moisture accumulation.

Watering

Once well established, Olearia macrodonta is fairly drought-tolerant. Provide plenty of water during the first growing season to stimulate strong roots. After establishment, rainwater will usually be sufficient, especially in temperate climates.

During very dry periods, you can provide supplemental water, especially for young plants. The plant has no special water requirements in winter.

Pruning

Olearia macrodonta responds well to pruning to maintain shape and compactness. After flowering in September, you can cut the plant back to the desired size. This also stimulates more flowers in the following spring.

Avoid severe pruning of old wood, as this recovers slowly. Regular light pruning keeps the plant in better shape.

Maintenance calendar

Spring: check growing points and space for expansion. Prune lightly if needed for shape. Add organic material around the base. Summer: enjoy the flowering period. Check for dry spells and water if needed. Autumn: second flowering period appears. Light pruning after August bloom to keep plant compact. Winter: no maintenance needed. Plant is hardy to approximately -10 degrees Celsius.

Winter hardiness

Olearia macrodonta is hardy to approximately -10 degrees Celsius under normal conditions, but very young plants and specimens in extremely exposed locations may need protection in the first years. In harsher winters, leaf damage can occur, but the plant will normally grow back out.

Once well established (after two to three years), the plant is reliably hardy in most temperate gardens.

Companion plants

Olearia macrodonta combines well with other New Zealand shrubs such as Griselinia littoralis, Leptospermum scoparium, and Hebe varieties. These create an interesting textural mix and together enhance the appeal of your green structure.

Closing

The New Zealand holly is a robust choice for those who want their front garden to be interesting year-round. With minimal care and a clean, striking appearance, you'll enjoy this reliable shrub for years.

Looking for a strong, low-maintenance shrub? Olearia macrodonta certainly deserves a place in your garden. Available from garden centers and nurseries.

More inspiration can be found on gardenworld.app where you can bring your complete garden design to life.