North America Native Plant

Mountain Ash

Botanical name: Sorbus

USDA symbol: SORBU

Life cycle: perennial

Habit: shrub

Native status: It's either native or not native in Alaska âš˜ It's either native or not native in Canada âš˜ Native to Greenland âš˜ It's either native or not native in the lower 48 states âš˜ It's either native or not native in St. Pierre and Miquelon  

Mountain Ash: A Wildlife-Friendly Addition to Your Garden If you’re looking for a plant that offers year-round interest and serves as a wildlife magnet, mountain ash (Sorbus) might just be the perfect addition to your landscape. This versatile shrub brings together beautiful flowers, colorful berries, and incredible wildlife value in ...

Mountain Ash: A Wildlife-Friendly Addition to Your Garden

If you’re looking for a plant that offers year-round interest and serves as a wildlife magnet, mountain ash (Sorbus) might just be the perfect addition to your landscape. This versatile shrub brings together beautiful flowers, colorful berries, and incredible wildlife value in one tidy package.

What is Mountain Ash?

Mountain ash is a perennial, multi-stemmed woody shrub that typically grows to about 13-16 feet tall, though it can sometimes reach greater heights or develop a single trunk depending on growing conditions. Don’t let the name fool you – it’s not actually related to true ash trees! This hardy plant is beloved by gardeners for its seasonal transformations and its ability to attract wildlife throughout the growing season.

Where Does Mountain Ash Grow?

Mountain ash has an impressively wide distribution across North America, thriving in locations from Alaska and the Canadian provinces down through most of the continental United States. You’ll find it growing naturally in states ranging from Maine to California, and from Montana down to Georgia. According to available data, it’s confirmed as native to Greenland, though its native status varies across other regions.

Why Plant Mountain Ash in Your Garden?

Wildlife Benefits

One of the most compelling reasons to consider mountain ash is its incredible value to wildlife. This plant is truly a buffet for various creatures:

  • Large animals rely on mountain ash for 10-25% of their diet and occasionally use it for cover
  • Small mammals incorporate it into 2-5% of their diet and use it sparingly for shelter
  • Terrestrial birds depend on it for 5-10% of their diet, though they don’t frequently use it for cover

Aesthetic Appeal

Mountain ash offers multi-season interest that keeps your garden looking great year-round. In spring, clusters of creamy white flowers create a stunning display while attracting pollinators like bees and flies. Come fall, the plant produces vibrant berries in shades of red or orange that provide a gorgeous pop of color just when many other plants are winding down for the season.

Growing Mountain Ash Successfully

Ideal Growing Conditions

Mountain ash is refreshingly low-maintenance once established. Here’s what it prefers:

  • Well-drained soil (though it’s quite adaptable)
  • Full sun to partial shade
  • Generally hardy in USDA zones 3-7, depending on the specific variety
  • Regular water during establishment, then quite drought tolerant

Planting and Care Tips

Getting your mountain ash off to a good start is straightforward:

  • Plant in spring or fall for best establishment
  • Space appropriately – remember this shrub can reach 13-16 feet in height and width
  • Water regularly the first year, then reduce frequency as the plant establishes
  • Consider deer protection if these animals are common in your area
  • Minimal pruning needed – just remove dead or damaged branches

Perfect Garden Roles

Mountain ash shines in several garden settings:

  • Wildlife gardens where you want to support local fauna
  • Naturalized areas and woodland edges
  • Mixed shrub borders for seasonal interest
  • As a specimen plant where its multi-season appeal can be showcased

Things to Consider

While mountain ash offers many benefits, there are a few things to keep in mind. Since native status varies by region, consider researching native alternatives in your area that might provide similar benefits while supporting local ecosystems. Additionally, if you’re working with a smaller garden space, remember that this shrub needs room to reach its full potential.

The Bottom Line

Mountain ash is a fantastic choice for gardeners who want to support wildlife while enjoying beautiful seasonal displays. Its combination of spring flowers, fall berries, and valuable food source for animals makes it a hardworking addition to any landscape. With minimal care requirements and maximum visual impact, it’s no wonder this plant has found its way into gardens across North America.

Wildlife Status

Want to attract wildlife or keep hungry critters away from your garden? Understanding the relationship between plants and wildlife is key. While plant tags may indicate deer and rabbit resistance, they don't tell the full story. Every gardener has experienced the disappointment of purchasing "deer-resistant" plants only to find them nibbled to the ground!

The extent to which plants are resistant to animal browsing is a matter of degree. Likewise, the extent to which a plant attracts wanted visitors also varies. Whether you want a garden full or free of wildlife, learning about interactions between a plant and wild animals can help you make smarter choices for the garden you desire.

As shown below Shrubby Indian Mallow isn't a large food source for animals or birds. You can confidently add this plant to your garden and rest assured knowing it's unlikely to be devoured by four-legged visitors.

Small animals

2-5% of diet

Sparsely used as cover

Large animals

Average 10-25% of diet

Occasional source of cover

Terrestrial birds

5-10% of diet

Infrequently used as cover

Water birds

not a food source

not a source of cover

Sources:

Martin, A.C., H.S. Zim, and A.L. Nelson. 1951. American wildlife and plants: A guide to wildlife food habits. Dover Publications. New York.

Mountain 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

Rosales

Family

Rosaceae Juss. - Rose family

Genus

Sorbus L. - mountain ash

Species

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