North America Non-native Plant

Sharp-stipule Willow

Botanical name: Salix ×mollissima

USDA symbol: SAMO15

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

Sharp-Stipule Willow: A Mysterious Hybrid Worth Understanding If you’ve stumbled across the name sharp-stipule willow in your gardening research, you’re not alone in finding limited information about this intriguing plant. Salix ×mollissima, as it’s known botanically, is one of those hybrid willows that seems to slip quietly through the gardening ...

Sharp-Stipule Willow: A Mysterious Hybrid Worth Understanding

If you’ve stumbled across the name sharp-stipule willow in your gardening research, you’re not alone in finding limited information about this intriguing plant. Salix ×mollissima, as it’s known botanically, is one of those hybrid willows that seems to slip quietly through the gardening literature, leaving many of us scratching our heads and wondering what exactly we’re dealing with.

What Exactly Is Sharp-Stipule Willow?

The × symbol in the scientific name Salix ×mollissima is your first clue that this isn’t your typical willow species—it’s a hybrid. This means it’s the result of two different willow species crossing paths (literally), creating something new and often quite rare in the wild. Hybrid willows can be fascinating plants, but they’re also notoriously difficult to pin down when it comes to specific growing requirements and characteristics.

Sharp-stipule willow gets its common name from its distinctive stipules—those little leaf-like structures at the base of the leaf stems that are apparently quite pointy in this particular hybrid.

The Information Gap

Here’s where things get a bit tricky: comprehensive information about this specific hybrid is surprisingly scarce. We don’t have clear documentation about its native range, exact growing requirements, or even its current conservation status. This information gap isn’t uncommon with hybrid plants, especially those that might be quite rare or have limited distribution.

Should You Plant Sharp-Stipule Willow?

Given the limited available information about Salix ×mollissima, making a recommendation about planting it is challenging. Without clear data on its native status, invasiveness potential, or specific growing requirements, it’s difficult to provide the guidance you’d want before adding any plant to your landscape.

If you’re interested in willows for your garden, consider exploring these alternatives:

  • Research native willow species in your specific region
  • Contact your local native plant society for recommendations
  • Consult with your county extension office about suitable willow varieties
  • Visit local botanical gardens to see which willows thrive in your climate

The Bigger Picture

The mystery surrounding sharp-stipule willow actually highlights an important point about gardening with native and near-native plants: not every plant that sounds interesting or has a compelling name is necessarily the right choice for your garden. Sometimes the most responsible approach is to stick with well-documented, locally appropriate species.

Willows as a group are fantastic for wildlife, often supporting numerous species of butterflies, moths, and other beneficial insects. They’re also excellent for erosion control and can thrive in wet conditions where other trees struggle. If you’re drawn to the idea of growing willows, focusing on documented native species in your area will give you the best chance of success while supporting local ecosystems.

Moving Forward

If you’ve encountered Salix ×mollissima growing somewhere and are curious about it, consider reaching out to local botanists, native plant societies, or university extension programs. They might have more specific information about this hybrid in your region, or they could help you identify whether what you’re seeing is actually this species or another similar willow.

Sometimes the most interesting gardening adventures come from the plants we can’t immediately figure out—but they also remind us of the value of choosing plants we understand well, especially when we’re trying to create sustainable, wildlife-friendly landscapes.

Sharp-stipule Willow

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Salicales

Family

Salicaceae Mirb. - Willow family

Genus

Salix L. - willow

Species

Salix ×mollissima Ehrh. - sharp-stipule willow

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