A Tough Native Shade Tree with Glowing Gold Fall Color

Autumn Treasure Ironwood (Ostrya virginiana 'JFS-KW5') is an improved selection of Minnesota's native ironwood, bred for a more uniform pyramidal-to-oval crown and brighter fall color than the wild species. Expect glowing golden-yellow to bronze foliage that lingers into late fall, on a tough, adaptable tree that handles sun or shade, clay or dry soil, and brutal Minnesota winters. Whether you need a dependable mid-size shade tree for a Plymouth backyard, a boulevard tree in Edina, or a native for a Woodbury woodland edge, Autumn Treasure delivers.

Autumn Treasure Ironwood Plant Details

Autumn Treasure Ironwood Uses in Minnesota Landscapes

Reliable Mid-Size Shade and Lawn Tree

At 25 to 35 feet tall with a tidy oval crown, Autumn Treasure is right-sized for a typical Twin Cities yard — big enough to throw real shade, small enough not to overwhelm a lot. Its improved, uniform form makes it a far cleaner choice than wild ironwood for a front lawn or backyard focal tree in Edina, Plymouth, or Maple Grove, finishing the season with a glow of gold.

Tough Boulevard, Urban, and Dry Sites

Ironwood is famous for durability, and this selection keeps that toughness: once established it tolerates drought, clay, dry soil, and the compacted, reflected-heat conditions of streetside plantings. That makes it an excellent boulevard tree, parking-island tree, or pick for a hot, dry corner in Woodbury or Eden Prairie where softer trees decline.

Native and Shade-Tolerant Plantings

As an improved native, Autumn Treasure shines in naturalized and woodland settings. Ironwood is one of the most shade-tolerant trees we carry — it grows happily under taller oaks and maples — so it's ideal for layering a woodland edge or filling a shadier corner in Minneapolis and St. Paul where sun-loving trees thin out.

Best Time to Plant Autumn Treasure Ironwood in Minnesota

As a deciduous tree, Autumn Treasure can be planted across a wider window than evergreens. Spring (late April through May, once the ground has thawed) and fall (September through the end of October) are both excellent, since the tree is leafless or hardening off and transplant stress is low. Spring planting allows a full season to establish; fall planting uses warm soil and cool air for strong rooting. Avoid the heat of midsummer when possible. Hardy deciduous trees and shrubs, including balled-and-burlapped stock, plant successfully through the end of October — after that, frozen ground can heave new roots.

How to Plant Autumn Treasure Ironwood

1. Dig wide, not deep. Make the hole 2 to 3 times the width of the root ball but no deeper — the root flare should sit slightly above grade. In heavy clay, go even wider.
2. Check drainage. Fill the hole with water; if it pools for hours, loosen the surrounding clay or mound-plant a few inches high so roots aren't waterlogged.
3. Backfill with amended soil. Mix native soil with 20 to 30 percent compost to loosen heavy clay and hold moisture during establishment.
4. Set it at the right depth. Plant so the root flare is visible at the surface — never bury the trunk. Remove twine and fold back burlap on B&B stock.
5. Build a water basin. Form a 3 to 4 inch soil ring around the base to direct water to the roots. Flatten it before winter so ice doesn't collect against the trunk.
6. Mulch with bark. Spread 2 to 3 inches of shredded bark or wood chips in a wide ring, kept 2 inches off the trunk. Skip gravel mulch — it bakes roots and offers no winter insulation.

Watering Autumn Treasure Ironwood in Minnesota

First Year Watering Schedule

• Weeks 1–2: Deep soak every 1 to 2 days (15–25 minutes at a slow trickle).
• Month 1–2: Every 3 to 4 days, keeping the root zone evenly moist.
• Month 3–6: Every 5 to 7 days during active growth; more in heat, less when rain is steady.
• Stop watering 2 to 3 weeks before the ground freezes (late October in the metro) so the tree can harden off for winter.

After Year One

Once established, ironwood is genuinely drought-tolerant and rarely needs supplemental water. During prolonged dry spells (two-plus weeks without rain), give it a deep soak every 10 to 14 days; otherwise let Minnesota's rainfall do the work. Its toughness after establishment is a big part of why it's such a low-maintenance tree.

Will Autumn Treasure Ironwood survive a Minnesota winter?

Easily — it's hardy to roughly -40°F (USDA zone 3), well below anything the Twin Cities' zone 4b–5a delivers, and as a selection of a local native it's fully adapted to our winters. No special winter protection is needed once established.

Is it deer-resistant?

Generally yes. Ironwood is rarely a deer favorite, so Autumn Treasure holds up better than most young trees in high-pressure western suburbs like Minnetonka and Wayzata. A trunk guard is still wise the first winter or two to prevent buck rub, but heavy browse is uncommon.

How shade-tolerant is it?

Very. Ironwood naturally grows as an understory tree beneath taller hardwoods, so Autumn Treasure thrives in part shade where sun-demanding trees struggle. It also takes full sun, giving you flexibility to place it almost anywhere — a shady side yard or an open lawn.

What makes this better than a wild ironwood?

The 'Autumn Treasure' selection was chosen for a more uniform, symmetrical pyramidal-to-oval crown and brighter, more consistent golden-bronze fall color than seed-grown ironwood. You get all the legendary toughness of the native species in a cleaner, more landscape-ready form.

You May Also Like

• Ironwood — the straight native species, ideal for naturalized and woodland-edge plantings.
• Kentucky Coffeetree — a bold native shade tree with dramatic branch structure for larger spaces.
• Prairie Dream Birch — a hardy white-barked native birch for bright bark and bird value.
• Nannyberry Viburnum — a native small specimen tree with spring flowers, bird berries, and burgundy fall color.

How Many Autumn Treasure Ironwood Do I Need?

Autumn Treasure is a specimen shade tree, so most yards need just one as a lawn or boulevard tree. With a mature spread of 18–25 feet, space multiple trees 20–25 feet apart (trunk to trunk) for touching canopies, or 25–30 feet for distinct crowns. For a naturalized woodland edge, stagger a loose group of 3 at 15–20 feet apart and let the crowns knit together over time.

Autumn Treasure Ironwood Season-by-Season in Minnesota

• Spring: Fresh green leaves emerge along the tidy pyramidal crown, with subtle catkins that dangle before the foliage fills in.
• Summer: A dense canopy of crisp, birch-like dark green leaves casts cooling shade; hop-like papery seed clusters develop and feed songbirds.
• Fall: The headline act — glowing golden-yellow to bronze color that arrives reliably and lingers later than most shade trees.
• Winter: Fine-textured, shreddy gray-brown bark and an even oval silhouette give quiet structure; some bronze leaves often persist into early winter.

At a Glance

✔ Minnesota Native   ✔ Deer-Resistant   ✔ Drought-Tolerant   ✔ Shade-Tolerant

Plant It With

• Ironwood (Hophornbeam) — the straight native species; pair them along a woodland edge for a layered native look.
• Kentucky Coffeetree — a bold-textured native canopy tree that towers behind ironwood's mid-size crown.
• Prairie Dream Birch — white native bark that pops against ironwood's gold fall color.
• Nannyberry Viburnum (Tree Form) — a native understory companion with spring bloom and bird berries.

Is Autumn Treasure Ironwood Right for Your Yard?

Pick Autumn Treasure if you want a tough, no-fuss mid-size shade tree that handles full sun or part shade, clay or dry soil, boulevard conditions, and deer pressure — all with dependable gold fall color. It's not a fit if you need fast shade: ironwood grows slowly to moderately, so choose a maple or elm where speed matters more than durability.