North America Non-native Plant

Alpine-ash

Botanical name: Eucalyptus delegatensis

USDA symbol: EUDE13

Native status: Not native but doesn't reproduce and persist in the wild

Alpine Ash: The Majestic Mountain Eucalyptus for Large Landscapes If you’ve ever dreamed of having a towering, elegant tree that brings a touch of the Australian Alps to your property, meet the alpine ash (Eucalyptus delegatensis). This impressive eucalyptus species, also known as mountain-ash stringybark, is one of nature’s skyscrapers ...

Alpine Ash: The Majestic Mountain Eucalyptus for Large Landscapes

If you’ve ever dreamed of having a towering, elegant tree that brings a touch of the Australian Alps to your property, meet the alpine ash (Eucalyptus delegatensis). This impressive eucalyptus species, also known as mountain-ash stringybark, is one of nature’s skyscrapers – and it’s not for the faint of heart or small of yard!

What Makes Alpine Ash Special?

Alpine ash is a true showstopper in the eucalyptus family. Picture a tree that can soar to incredible heights, with smooth, pale bark that peels away in long ribbons to reveal fresh, cream-colored bark underneath. It’s like nature’s own version of gift-wrapping that keeps on giving! The aromatic leaves release that distinctive eucalyptus scent, especially on warm days or when crushed.

This tree hails from the cool, mountainous regions of southeastern Australia, where it thrives in the alpine and subalpine zones of Victoria, New South Wales, and Tasmania. In its native habitat, it’s a forest giant that plays a crucial role in the ecosystem.

Size Matters: Is Alpine Ash Right for Your Space?

Here’s where we need to have a serious chat about space. Alpine ash is not your typical backyard tree – it’s more like inviting a gentle giant to take up residence. This eucalyptus can reach truly impressive heights and spreads, making it suitable only for:

  • Large rural properties with plenty of room
  • Acreage where you want a dramatic specimen tree
  • Properties needing a substantial windbreak
  • Large-scale landscape projects or parks

If you’re working with a typical suburban lot, you’ll want to admire this beauty from afar and consider smaller native alternatives instead.

Growing Conditions and Care

Alpine ash earned its name for good reason – it loves cool, moist conditions reminiscent of mountain environments. Here’s what this tree needs to thrive:

Climate Requirements: This tree prefers cooler climates and can handle frost better than many eucalyptus species. It’s generally hardy in USDA zones 8-10, with some specimens tolerating even cooler conditions.

Soil and Water: Well-draining soil is essential, but alpine ash appreciates consistent moisture, especially during its younger years. It’s not particularly picky about soil type but performs best in fertile, loamy soils.

Sunlight: Full sun is preferred for optimal growth and form development.

Planting and Long-term Care

If you’ve decided you have the space and climate for an alpine ash, here are some key growing tips:

  • Plant in spring when the risk of hard frost has passed
  • Give young trees regular water until established (typically 2-3 years)
  • Minimal pruning is needed – this tree naturally develops good form
  • Be patient – eucalyptus trees are generally fast growers once established
  • Consider the mature size when planting near structures or power lines

Wildlife and Pollinator Benefits

One of the most rewarding aspects of growing alpine ash is watching it come alive with wildlife activity. The flowers provide valuable nectar for bees and other pollinators, while the tree structure offers nesting sites for various bird species. In its native range, it’s an important food source for native wildlife.

The Bottom Line

Alpine ash is a spectacular tree for those with the right space and growing conditions. Its impressive stature, beautiful bark, and wildlife value make it a worthy addition to large properties in suitable climates. However, if you’re gardening in a smaller space or outside its preferred climate zone, you might want to explore native alternatives that offer similar benefits on a more manageable scale.

Remember, the key to successful gardening is choosing plants that match both your space and your local growing conditions. When in doubt, consult with local native plant experts who can suggest the best options for your specific situation!

Alpine-ash

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Myrtales

Family

Myrtaceae Juss. - Myrtle family

Genus

Eucalyptus L'Hér. - gum

Species

Eucalyptus delegatensis R.T. Baker - alpine-ash

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA