North America Non-native Plant

Maries’ Ash

Botanical name: Fraxinus mariesii

USDA symbol: FRMA3

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

Maries’ Ash: A Mysterious Member of the Ash Family If you’ve stumbled across the name Maries’ ash (Fraxinus mariesii) in your plant research, you might be scratching your head wondering what exactly this tree is all about. You’re not alone! This particular ash species is something of an enigma in ...

Maries’ Ash: A Mysterious Member of the Ash Family

If you’ve stumbled across the name Maries’ ash (Fraxinus mariesii) in your plant research, you might be scratching your head wondering what exactly this tree is all about. You’re not alone! This particular ash species is something of an enigma in the gardening world, with very limited information available even to seasoned horticulturists and botanists.

What We Know (And What We Don’t)

Maries’ ash belongs to the ash family (Fraxinus), which includes many well-known and widely cultivated trees. However, Fraxinus mariesii appears to be either extremely rare, poorly documented, or possibly exists primarily in specialized botanical collections rather than general cultivation.

The lack of readily available information about this species means we can’t provide details about its:

  • Native range and geographical distribution
  • Mature size and growth habits
  • Specific growing requirements
  • USDA hardiness zones
  • Wildlife and pollinator benefits
  • Invasive or conservation status

Should You Try to Grow Maries’ Ash?

Here’s the thing about mysterious plants like Fraxinus mariesii – while they might sound intriguing, the lack of available growing information makes them impractical choices for most home gardeners. Without knowing basic details like hardiness zones, mature size, or care requirements, you’d essentially be conducting an expensive gardening experiment with uncertain results.

Better Ash Alternatives for Your Garden

If you’re drawn to ash trees, there are several well-documented species that make excellent landscape choices:

  • White Ash (Fraxinus americana) – A stately native North American tree with excellent fall color
  • Green Ash (Fraxinus pennsylvanica) – Adaptable and tolerant of various soil conditions
  • Blue Ash (Fraxinus quadrangulata) – Known for its distinctive square twigs and yellow fall color

These alternatives come with the advantage of established growing guides, known hardiness zones, and predictable mature characteristics.

If You’re Determined to Learn More

For the truly curious plant enthusiasts who can’t let go of the Maries’ ash mystery, your best bet is to:

  • Contact specialized botanical gardens or arboretums
  • Reach out to ash tree specialists or dendrologists
  • Check with university extension services
  • Consult specialized botanical databases and herbarium records

The Bottom Line

While Maries’ ash might sound like an intriguing addition to your plant collection, the lack of available growing information makes it a risky choice for most gardeners. Sometimes the most mysterious plants are mysterious for a reason – they might be extremely rare, difficult to cultivate, or simply not well-suited to general garden use.

For a successful and satisfying gardening experience, consider choosing from the many well-documented ash species that offer proven performance and known growing requirements. Your garden (and your wallet) will thank you for the practical choice!

Maries’ 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 mariesii Hook. f. - Maries' ash

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