Growing Walnut Trees From Nuts

1 to 2 inches (2.5 to 5 cm) is the planting depth for black walnut nuts, planted outdoors in fall so winter can break their dormancy. Growing a walnut from seed is inexpensive and rewarding, but the resulting tree will be genetically different from its parent and may not produce the same quality of nuts. The planting method below focuses on black walnut; English or Persian walnut seedlings need the same fresh, cold-treated seed approach, but a grafted tree is the better choice when you want predictable nut quality.

Use this planning guide before you collect or plant nuts.

Task	Figure or Decision	Why It Matters
Seed nuts to collect	At least 10–15 nuts	Some nuts will be empty, dry out, be eaten, or fail to sprout.
Quick float test	At least 60 seconds	Keep nuts that sink; floating nuts are less promising.
Optional extended soak	12–24 hours	A longer soak can help sort nuts that were slow to sink.
Black walnut planting depth	1–2 inches (2.5–5 cm)	Deep enough to protect the nut while allowing spring emergence.
Rodent barrier	12 × 12 inches of chicken wire	Helps stop squirrels and other animals from digging up the nut.
Home-orchard spacing	30–50 feet apart	Gives mature trees room for roots and canopy.
Mature size	About 50 feet tall and 50 feet wide	A walnut is a long-term shade tree, not a small backyard fruit tree.
Mulch over the root zone	2–3 inches	Reduces weeds and helps the soil hold moisture.
First nuts	Usually at 7–8 years old	Seed-grown walnuts are a long-term project.
Full production	About 15 years old	Nut crops improve as the tree matures.
Utah growing-season benchmark	140–150 days above 27–29°F	Earliest-ripening walnuts need a sufficiently long frost-free season.

What Growing a Walnut From Seed Produces

A walnut nut is a seed, not a clone. A seedling can inherit useful traits from its parent tree, but it can also differ in nut size, shell thickness, flavor, disease tolerance, harvest timing, and overall growth habit.

Black walnut and English walnut are the two types most home growers encounter in the United States. Black walnut is valued for its strong-flavored nuts, native-tree character, and timber potential. English walnut, also called Persian walnut, is the familiar mild-flavored walnut sold in stores.

If your main goal is a known nut variety with dependable ripening and shell quality, buy a named grafted tree. If your goal is to grow an adapted tree from a local parent, provide shade, support wildlife, or simply experiment, starting with nuts makes sense.

Freshness matters. A nut that has been left warm and dry for a long period may no longer contain a living embryo. Nuts also need a cool, moist winter period before they will normally sprout in spring. Direct-sowing outdoors in fall is the simplest way to provide that natural cold treatment.

Choose the Right Nut and Permanent Site

Start with nuts from a healthy, mature tree growing in a climate similar to yours. Avoid nuts with holes, cracks, mold, or obvious insect damage. Do not use black walnut nuts from a tree with unexplained dieback if thousand cankers disease is a concern in your region.

Most walnuts eventually reach about 50 feet high with a similar spread, and home-orchard trees need 30 to 50 feet between permanent planting locations. Leave room for the canopy, roots, falling nuts, and future access; keep the tree well away from buildings, overhead lines, driveways, septic systems, and vegetable beds.

Black walnut deserves extra space around other plants. Its roots, leaves, hulls, and twigs contain juglone, a natural compound that can suppress sensitive plants. Tomatoes, potatoes, peppers, and some ornamentals are poor neighbors for black walnut.

A sunny site with deep soil that drains well gives the seedling the best start. Walnuts can tolerate moisture better than drought once established, but they do not do well in a spot that stays waterlogged.

Climate determines whether a tree will merely survive or reliably make nuts. In Utah, even the earliest-ripening walnut cultivars need 140 to 150 days with temperatures above 27–29°F; late spring and early fall freezes can interrupt flowering or nut ripening. Check the local freeze-free season in the Utah Climate Center online database when planning for production rather than shade alone.

Black walnut also carries a serious disease risk in affected areas. Thousand cankers disease is especially important in black walnut and is nearly 100% fatal within 2 to 4 years after infection. Utah State University Extension also notes that species choice matters when selecting a site.

How to Grow a Walnut Tree From a Nut

Direct-sow mature nuts in fall, then protect the planting spot through winter. This method keeps the nut outdoors until spring.

Match your goal to the starting material and trade-off in this table.

Your Goal	Best Starting Material	Important Trade-Off
Grow a native-style shade tree or black walnuts	Fresh black walnuts from a healthy local tree	Seedlings vary, but locally adapted parents are a useful starting point.
Produce predictable English walnuts	A named grafted English walnut tree	Costs more initially but avoids seedling variation.
Experiment with an English walnut nut	Fresh nuts from a local English walnut	The tree may differ substantially from the parent.

Step 1: Collect, Husk, and Test the Nuts

Collect at least 10–15 mature nuts. Gather them soon after they ripen and drop, before insects, rodents, heat, or drying damage them.
For black walnuts, remove the thick green or black outer husk while wearing gloves. The hull can stain hands, clothing, concrete, and tools. Leave the hard shell intact.
Put the cleaned nuts in water for at least 60 seconds. Keep the nuts that sink and set aside those that float.
If a nut seems slow to sink or you want a second screen, leave it in water for 12–24 hours. Keep the sinkers, then plant them promptly.

The float test is a sorting tool, not a guarantee. A sunk nut still needs proper winter conditions, protection from animals, and a suitable planting site.

Step 2: Plant the Nut in Its Final Location

Clear grass, weeds, and heavy mulch from the spot. Young walnut roots compete poorly with dense turf.
Loosen the surface soil enough to make a planting hole without creating a deep, loose pocket that will settle.
Plant each black walnut nut 1–2 inches deep, then cover it with native soil and press the soil gently so it contacts the shell.
Water the planting spot thoroughly so the soil settles around the nut. Keep the site moist through dry periods, but do not turn it into a soggy basin.
Mark the spot with a durable label or stake. It is easy to forget exactly where a nut was planted during winter.

Plant nuts where you are willing to keep the tree. Walnuts quickly develop a strong taproot, so moving a young tree later can be harder than planting it correctly from the start.

Step 3: Block Rodents and Let Winter Do the Work

Lay a 12 × 12-inch piece of chicken wire over the marked planting spot.
Pin or weigh down the edges so squirrels cannot simply lift the wire and dig underneath it.
Leave the site outdoors through winter. Seasonal changes help end dormancy.
In spring, check the marker regularly. Once a shoot approaches the wire, remove or raise the barrier so it cannot trap or rub against the young stem.

Do not dig up the nut repeatedly to check for roots. Disturbing the nut can break the emerging root or make it easier for animals to find.

Care for a Young Walnut Seedling

A new seedling needs protection from browsing animals more than it needs fertilizer.

Keep the Root Zone Mulched

After the seedling is up and the soil has warmed, spread 2–3 inches of mulch over the root zone. Mulch reduces weed competition, slows moisture loss, and supports faster growth, but keep it pulled back from the trunk so the bark stays dry.

Use clean leaves, shredded bark, wood chips, or another untreated organic mulch. In hot, humid conditions, avoid piling wet mulch against the stem, where it can encourage bark problems and provide cover for insects.

Water and Weed Without Smothering the Tree

Water slowly when the soil is drying around the seedling’s roots. A tree planted in turf or surrounded by aggressive weeds may stay alive but grow very slowly because grass takes much of the available water and nutrients.

Keep a clear, mulched circle around the tree. Pull weeds by hand rather than cultivating deeply near the seedling, since shallow digging can damage young roots.

Guard the Trunk

Rabbits, deer, lawn equipment, and pets can all damage a small walnut tree. Use a loose tree guard or small protective enclosure if browsing is common. Check it regularly so it does not rub the trunk, trap fallen leaves, or become too tight as the tree expands.

Confirm Germination and Establishment

A successful start is more than a shoot appearing above the soil. The seedling should open leaves, remain upright, and continue growing without chewing, rubbing, or repeated wilting.

Check these signs after the seedling emerges to confirm it is establishing well:

The shoot is growing from the marked planting spot rather than a nearby volunteer weed.
Leaves are opening and staying attached.
The stem is free of rodent damage.
Water drains away after rain rather than pooling around the trunk.

A seedling that leafs out weakly and then collapses may have suffered root damage, saturated soil, drought stress, or animal injury. Correct the site problem rather than trying to force growth with heavy fertilizer.

Solve Common Walnut Seedling Problems

The Nut Disappeared Before It Sprouted

Squirrels, chipmunks, and other animals can locate walnuts even after they are buried. Replace the nut in fall with a fresh one, use the chicken-wire cover, and secure the edges firmly. Starting with several nuts improves the odds that at least one will survive.

The Nut Never Sprouted

The most common reasons are poor seed quality or rodent removal. Start again the next fall with locally collected nuts.

Do not assume every nut that sinks in the float test is viable. That is why collecting a group of nuts is more reliable than betting on one.

The Seedling Is Barely Growing

Weed competition, shade, compacted soil, drought, and poor drainage can all slow a walnut seedling. Clear vegetation around the root zone, refresh the mulch, and adjust watering as needed.

Walnuts are naturally slow investments. A small tree may spend much of its early energy developing roots before it adds much visible height.

A Black Walnut Shows Serious Dieback

Do not move suspect black walnut wood, seedlings, or nuts to a new location. If a tree develops unexplained thinning or dieback, get a regional diagnosis before planting more black walnuts nearby.

Plan for Nut Production and Long-Term Growth

Most walnut species begin producing nuts at 7–8 years old and reach full production at about 15 years old. Those are common milestones, not guarantees; confirm the likely bearing age in information for your specific walnut species or cultivar.

Seed-grown trees can take longer or shorter than average, and their crops can vary from year to year. A tree may also bear heavily one year and lightly the next. Weather during flowering, late freezes, summer moisture, pollination timing, pests, and the tree’s genetics all affect the harvest.

Once your walnut is established, keep protecting its root zone from lawn competition and avoid compacting the soil beneath the canopy. As the tree gets large, its most useful role may be shade as much as nuts.

Frequently Asked Questions

Can I grow a walnut tree from a walnut that fell from the tree?

Yes, a freshly fallen, mature walnut can grow if it is intact, viable, and protected from animals. Collect at least 10–15 nuts because some will be empty, damaged, eaten, or fail to germinate. Avoid old, dried nuts that have sat exposed on the ground for a long time.

How many years does it take for a walnut tree to bear nuts?

Most walnut trees begin producing nuts at 7–8 years old and reach fuller production at about 15 years old. A seedling may vary from that timeline because it is genetically unique. Confirm expected bearing age in the information for your chosen walnut species or cultivar.

Can I eat walnuts straight off the tree?

Yes, the kernel is edible after the outer husk and hard shell are removed, but freshly picked walnuts often need curing for better flavor and texture. Do not eat moldy nuts or kernels with an off odor. Black walnut hulls are not the edible part and can stain skin intensely.

Do walnuts come from trees?

Yes. English and black walnut trees are grown for nut crops as well as shade. A black walnut can also be used to start a new tree from seed.

Do walnut trees grow walnuts every year?

Not necessarily. In most areas of Utah, late-spring or early-fall freezes can prevent many commercially available black and English walnut cultivars from fruiting reliably.