North America Native Plant

Singleleaf Ash

Botanical name: Fraxinus anomala var. lowellii

USDA symbol: FRANL

Life cycle: perennial

Habit: shrub

Native status: Native to the lower 48 states  

Synonyms: Fraxinus lowellii Sarg. (FRLO)   

Singleleaf Ash: A Rare Native Arizona Shrub Worth Knowing Meet the singleleaf ash (Fraxinus anomala var. lowellii), a native Arizona shrub that’s flying under the radar in most gardening circles. This perennial woody plant might not be the flashiest addition to your landscape, but it carries the quiet charm of ...

Singleleaf Ash: A Rare Native Arizona Shrub Worth Knowing

Meet the singleleaf ash (Fraxinus anomala var. lowellii), a native Arizona shrub that’s flying under the radar in most gardening circles. This perennial woody plant might not be the flashiest addition to your landscape, but it carries the quiet charm of a true Southwest native.

What Makes This Plant Special?

The singleleaf ash is a multi-stemmed shrub that typically stays under 13-16 feet tall, making it a manageable choice for most home landscapes. As a member of the ash family, it brings that classic ash tree character but in a more compact, shrub-like package. You might also see it listed under its scientific synonym, Fraxinus lowellii Sarg., in older botanical references.

Where Does It Call Home?

This variety of singleleaf ash is native to the lower 48 states, with its primary home base in Arizona. It’s one of those regional specialists that has adapted to thrive in the unique conditions of the Southwest desert landscape.

Should You Plant It in Your Garden?

Here’s where things get a bit tricky – while this native shrub has obvious appeal for Arizona gardeners looking to create authentic regional landscapes, detailed growing information is surprisingly scarce. This makes it more of a plant for the adventurous gardener or native plant enthusiast rather than someone looking for a well-documented, foolproof landscape choice.

The Native Advantage

As a true Arizona native, the singleleaf ash offers several potential benefits:

  • Naturally adapted to local climate conditions
  • Likely requires less water than non-native alternatives
  • Supports local ecosystem health
  • Provides authentic regional character to landscapes

Growing Challenges and Considerations

The biggest challenge with Fraxinus anomala var. lowellii isn’t necessarily growing it – it’s finding reliable information about how to grow it successfully. This variety appears to be quite specialized and isn’t commonly available in nurseries or well-documented in horticultural literature.

If you’re determined to try growing this native Arizona shrub, your best bet is connecting with native plant societies, botanical gardens, or specialized native plant nurseries in Arizona who might have experience with this particular variety.

The Bottom Line

The singleleaf ash represents the fascinating world of regional native plants that often get overlooked in mainstream gardening. While it may not be the easiest plant to source or grow due to limited available information, it offers the appeal of true local authenticity for Arizona landscapes.

For most gardeners, especially those outside of Arizona or those seeking well-documented native options, you might want to consider other native ash species or Southwest natives with more established growing guidelines. However, if you’re a native plant enthusiast in Arizona with a sense of horticultural adventure, this could be an interesting addition to a specialized native landscape project.

Singleleaf Ash

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Scrophulariales

Family

Oleaceae Hoffmanns. & Link - Olive family

Genus

Fraxinus L. - ash

Species

Fraxinus anomala Torr. ex S. Watson - singleleaf ash

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