North America Non-native Plant

Hunnewell Pine

Botanical name: Pinus ×hunnewellii

USDA symbol: PIHU3

Life cycle: perennial

Habit: tree

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

Hunnewell Pine: A Rare Hybrid Worth Understanding Meet the Hunnewell pine (Pinus ×hunnewellii), a botanical curiosity that’s more mystery than mainstream garden staple. This hybrid pine represents one of those fascinating plant crosses that pop up in the horticultural world, though you’re unlikely to stumble across one at your local ...

Hunnewell Pine: A Rare Hybrid Worth Understanding

Meet the Hunnewell pine (Pinus ×hunnewellii), a botanical curiosity that’s more mystery than mainstream garden staple. This hybrid pine represents one of those fascinating plant crosses that pop up in the horticultural world, though you’re unlikely to stumble across one at your local nursery.

What Exactly Is Hunnewell Pine?

The × in its botanical name is your first clue—this symbol indicates that Pinus ×hunnewellii is a hybrid species, meaning it’s the result of cross-breeding between two different pine species. As a perennial woody plant, it grows as a tree with a single trunk and can reach heights greater than 13-16 feet under the right conditions, though it may occasionally develop a multi-stemmed growth form depending on environmental factors.

Native Status and Distribution

Here’s where things get interesting (and a bit concerning from a native gardening perspective). Hunnewell pine is classified as a non-native species that has been introduced to North America. Despite being non-native, it has established itself and reproduces spontaneously in the wild without human intervention, currently documented in Massachusetts.

Should You Plant Hunnewell Pine?

This is where I’ll give you the straight scoop. While Hunnewell pine isn’t currently listed as invasive or noxious, its status as a non-native species that reproduces in the wild should give native plant enthusiasts pause. The extremely limited information available about this hybrid also means we don’t fully understand its long-term ecological impacts or garden performance.

Growing Conditions and Care

Unfortunately, detailed growing requirements for this specific hybrid are not well-documented. Like most pines, it would likely prefer:

  • Well-draining soil
  • Full sun exposure
  • Adequate space for root development
  • Protection from harsh winds when young

However, without specific cultivation data, growing this plant would be somewhat experimental.

Native Alternatives to Consider

Instead of taking a chance on this uncommon hybrid, consider these fantastic native pine options that will provide reliable performance and ecological benefits:

  • Eastern White Pine (Pinus strobus) – Massachusetts native with soft, blue-green needles
  • Pitch Pine (Pinus rigida) – Tough native that handles poor soils
  • Red Pine (Pinus resinosa) – Beautiful reddish bark and excellent wildlife value

The Bottom Line

While Hunnewell pine might intrigue plant collectors and hybrid enthusiasts, its rarity, limited cultivation information, and non-native status make it a questionable choice for most gardens. If you’re passionate about supporting local ecosystems and wildlife, you’ll get much more bang for your buck with native pine species that have proven track records and well-understood growing requirements.

Remember, the best garden plants are often the ones that have co-evolved with local wildlife and growing conditions—and that’s exactly what native species offer. Save yourself the guesswork and go native!

Hunnewell Pine

Classification

Group

Gymnosperm

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Coniferophyta - Conifers

Subdivision
Class

Pinopsida

Subclass
Order

Pinales

Family

Pinaceae Spreng. ex Rudolphi - Pine family

Genus

Pinus L. - pine

Species

Pinus ×hunnewellii Alb.G. Johnson [parviflora × strobus] - Hunnewell pine

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