North America Non-native Plant

Hairy Mock Orange

Botanical name: Philadelphus incanus

USDA symbol: PHIN33

Life cycle: perennial

Habit: shrub

Native status: Non-native, reproduces and persists in the wild in the lower 48 states  

Hairy Mock Orange: A Mysterious Shrub That Raises More Questions Than Answers If you’ve stumbled across the name hairy mock orange (Philadelphus incanus) in your gardening research, you’re probably scratching your head right about now. Don’t worry – you’re not alone in your confusion! This particular mock orange is something ...

Hairy Mock Orange: A Mysterious Shrub That Raises More Questions Than Answers

If you’ve stumbled across the name hairy mock orange (Philadelphus incanus) in your gardening research, you’re probably scratching your head right about now. Don’t worry – you’re not alone in your confusion! This particular mock orange is something of an enigma in the gardening world, and there’s a good reason why you haven’t heard much about it.

What We Know (And Don’t Know) About Hairy Mock Orange

Philadelphus incanus is classified as a perennial shrub that, like its mock orange cousins, would typically grow as a multi-stemmed woody plant reaching less than 13-16 feet in height. However, here’s where things get murky – reliable information about this specific species is surprisingly scarce, even among botanical resources.

According to available data, this plant is non-native to the United States and has been documented in Connecticut, where it apparently reproduces on its own in wild settings. But beyond these basic facts, details about its appearance, growing requirements, and garden performance remain largely unknown.

The Problem with Poorly Documented Plants

Here’s the thing about mystery plants like hairy mock orange – they can be risky choices for your garden. When we don’t have solid information about a plant’s:

  • Growth habits and mature size
  • Invasive potential
  • Environmental requirements
  • Wildlife interactions
  • Seasonal behavior

We’re essentially conducting an uncontrolled experiment in our own backyards. While that might sound exciting to some adventurous gardeners, it could lead to unexpected problems down the road.

Why This Matters for Your Garden

Since Philadelphus incanus is noted as non-native and capable of reproducing spontaneously in the wild, there’s always a possibility it could exhibit invasive tendencies in certain conditions. Without proper documentation of its behavior patterns, we simply can’t make informed decisions about its suitability for cultivation.

Better Alternatives: Native Mock Orange Options

Instead of gambling with a poorly understood species, consider these well-documented native alternatives that offer the classic mock orange appeal:

  • Lewis’ Mock Orange (Philadelphus lewisii) – Native to western North America with fragrant white flowers
  • Wild Hydrangea (Hydrangea arborescens) – Offers similar shrub structure with showy white flower clusters
  • Ninebark (Physocarpus opulifolius) – Native shrub with attractive bark and flowers that supports wildlife

The Bottom Line

While the name hairy mock orange might sound intriguing, the lack of reliable information about Philadelphus incanus makes it a questionable choice for most gardeners. The gardening world is full of well-documented, beautiful native plants that can provide the aesthetic appeal you’re looking for without the uncertainty.

If you’re set on growing a mock orange, stick with species that have proven track records and clear growing guidelines. Your garden – and local ecosystem – will thank you for making informed choices based on solid horticultural knowledge rather than taking chances with botanical mysteries.

Hairy Mock Orange

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

Hydrangeaceae Dumort. - Hydrangea family

Genus

Philadelphus L. - mock orange

Species

Philadelphus incanus Koehne - hairy mock orange

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