North America Native Plant

Stewart’s Little Walnut

Botanical name: Juglans microcarpa var. stewartii

USDA symbol: JUMIS

Life cycle: perennial

Habit: shrub

Native status: Native to the lower 48 states  

Stewart’s Little Walnut: A Rare Texas Native Worth Knowing If you’re a native plant enthusiast looking for something truly unique for your Texas garden, you might want to learn about Stewart’s little walnut (Juglans microcarpa var. stewartii). This lesser-known native shrub represents a fascinating piece of Texas’s botanical heritage, though ...

Stewart’s Little Walnut: A Rare Texas Native Worth Knowing

If you’re a native plant enthusiast looking for something truly unique for your Texas garden, you might want to learn about Stewart’s little walnut (Juglans microcarpa var. stewartii). This lesser-known native shrub represents a fascinating piece of Texas’s botanical heritage, though finding detailed growing information can be quite the treasure hunt!

What Makes Stewart’s Little Walnut Special?

Stewart’s little walnut is a perennial shrub that’s native to the United States, specifically calling Texas home. As a member of the walnut family, this multi-stemmed woody plant typically stays under 13-16 feet tall, making it more manageable than its towering tree relatives. What sets this variety apart is its shrub-like growth habit with several stems arising from or near the ground.

Where You’ll Find It Growing Wild

This native beauty has a pretty exclusive address – it’s found naturally only in Texas. Its limited geographical range makes it a true regional specialty, adding to its appeal for native plant collectors and conservation-minded gardeners.

Should You Plant Stewart’s Little Walnut?

Here’s where things get interesting (and a bit challenging). While this native shrub has definite appeal for several reasons, there are some considerations to keep in mind:

The Pros:

  • It’s a true Texas native, supporting local ecosystems
  • Manageable size as a shrub rather than a large tree
  • Part of the diverse walnut family, adding botanical interest
  • Perennial growth means it’s a long-term garden investment

The Challenges:

  • Very limited availability in the nursery trade
  • Scarce cultivation information and growing guides
  • Specific growing requirements may be unknown
  • May require specialized care or conditions

Growing Conditions and Care

Unfortunately, specific growing conditions, USDA hardiness zones, and detailed care instructions for Stewart’s little walnut are not readily available in standard horticultural sources. This is often the case with rare native varieties that haven’t entered mainstream cultivation.

If you’re determined to grow this unique native, your best bet would be to:

  • Contact native plant societies in Texas
  • Reach out to botanical gardens or universities with native plant programs
  • Connect with specialized native plant nurseries
  • Observe its natural growing conditions if you can locate wild populations

A Plant for Dedicated Native Enthusiasts

Stewart’s little walnut is definitely not your run-of-the-mill garden center find. It’s more of a holy grail plant for serious native plant collectors. If you do manage to source this rare variety, make sure you’re working with reputable sources that practice responsible collection and propagation methods.

While we’d love to give you a complete growing guide, sometimes the rarest natives require a bit of detective work and patience. The good news? That just makes growing Stewart’s little walnut all the more rewarding when you succeed!

The Bottom Line

Stewart’s little walnut represents the kind of botanical treasure that makes native plant gardening so exciting – and occasionally frustrating. It’s a true Texas native with unique character, but it’s also a plant that requires dedication to source and grow successfully. If you’re up for the challenge and committed to supporting native Texas flora, this unusual shrub might just become the crown jewel of your collection.

Stewart’s Little Walnut

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Hamamelididae

Order

Juglandales

Family

Juglandaceae DC. ex Perleb - Walnut family

Genus

Juglans L. - walnut

Species

Juglans microcarpa Berl. - little walnut

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