What Does It Take to Clone a Redwood Tree?

Redwoods have been cloning themselves for millions of years without any human help. Walk through a coast redwood forest and you'll notice rings of younger trees growing around the base of ancient stumps — each one a genetic copy of the original. The fact that nature already does this so effectively raises an interesting question about whether we can replicate the process at home or in a nursery setting, and what that actually involves.

Understanding the Two Types of Redwood

Before getting into cloning methods, it's worth knowing which redwood you're talking about, because the species behaves very differently when it comes to vegetative reproduction. The two main types most people encounter are the coast redwood (Sequoia sempervirens) and the giant sequoia (Sequoiadendron giganteum). A third species, the dawn redwood (Metasequoia glyptostroboides), is a smaller deciduous relative from China that has become a popular ornamental tree.

Coast redwoods grow along the foggy Pacific coastline from southern Oregon to central California. They hold the record as the tallest living organisms on Earth, with the champion tree Hyperion reaching over 380 feet. These trees are the ones famous for their natural cloning ability — they sprout vigorously from their root systems, stumps, and burls.

Giant sequoias grow inland on the western slopes of the Sierra Nevada mountains. They're the most massive trees by volume but don't share the coast redwood's talent for sprouting from roots and stumps. This biological difference has major implications for anyone interested in cloning one species versus the other.

How Redwoods Clone Themselves in Nature

Coast redwoods have a remarkable survival strategy that very few other conifer species share. When a tree is damaged by fire, wind, or logging, dormant buds beneath the bark and within the root system activate and send up new shoots. These shoots are genetically identical to the parent tree — true natural clones that carry the exact same DNA.

The burls you see at the base of coast redwoods are packed with these dormant bud tissues. Some burls can survive underground for centuries, waiting for the right trigger — usually the loss of the canopy above them — to begin growing. This explains the iconic fairy rings found throughout coast redwood forests, where a circle of tall trees marks the footprint of an ancient ancestor that fell or was cut long ago.

This natural cloning ability means some coast redwood genetic lineages are thousands of years old, even though no single trunk from that lineage has survived that entire span. The trees essentially achieve a form of biological immortality through continuous vegetative reproduction.

Giant sequoias, by contrast, rely almost entirely on seed reproduction. Their cones need fire to open and release seeds, and the cleared, mineral-rich soil left after a forest fire provides ideal germination conditions. This makes giant sequoias significantly harder to propagate through cloning methods.

The Methods People Use to Clone Redwoods

Now for the practical part — the techniques that actually work for creating genetic copies of these trees. There are three primary approaches, each with different success rates, equipment requirements, and skill levels involved.

Stem cuttings represent the most accessible method for home gardeners and small nurseries. You take a section of a young branch, treat it with rooting hormone, and place it in a controlled environment to encourage root development. Coast redwoods respond reasonably well to this approach, especially when the source material comes from young trees or juvenile growth near the base of older specimens.

Burl propagation takes advantage of the coast redwood's natural cloning mechanism. Burl tissue contains meristematic cells — essentially plant stem cells — that can generate entirely new trees when separated from the parent and given proper growing conditions. Nurseries sometimes sell small redwood burls specifically for this purpose.

Tissue culture (micropropagation) represents the most advanced method, used primarily by research institutions and commercial nurseries working on conservation projects. Tiny pieces of plant tissue are grown in sterile lab conditions with carefully formulated nutrient media. This technique can produce hundreds of identical clones from a single source tree and has been central to efforts like the Archangel Ancient Tree Archive, an organization that has successfully cloned some of the world's oldest and largest coast redwoods.

Cloning a Coast Redwood from Cuttings Step by Step

Taking stem cuttings from a coast redwood works best during late fall through early winter when the tree's growth has slowed and the wood has partially hardened. Here's how the process works for a home gardener willing to be patient and attentive.

1. Select healthy branch tips from the lower portion of the tree where growth tends to be more juvenile — juvenile tissue roots far more readily than mature wood from the upper canopy
2. Cut 6 to 8 inch sections using clean, sharp pruning shears, making your cut just below a leaf node
3. Strip the needles from the lower 2/3 of each cutting, leaving foliage only on the top portion
4. Scrape a thin strip of bark (about 1 inch long) from the base of the cutting to expose the cambium layer
5. Dip the wounded base into a rooting hormone powder formulated for semi-hardwood cuttings — look for a product with 0.3% to 0.8% IBA (indolebutyric acid)
6. Insert the cutting about 2 to 3 inches deep into a pot filled with a well-draining propagation mix of equal parts perlite and peat moss
7. Water thoroughly and cover with a clear plastic bag or place in a humidity dome to maintain moisture levels above 80%
8. Set the pot in a bright location with indirect light — direct sun will overheat the cutting and dry it out
9. Mist the cuttings regularly and check soil moisture every few days
10. Wait 8 to 16 weeks for roots to develop — gently tug the cutting to check for resistance, which indicates root growth

Patience matters enormously here. Redwood cuttings can take three to four months to develop adequate root systems, and success rates for home propagation typically range from 30% to 60%. Taking multiple cuttings at once dramatically improves your chances of ending up with at least a few viable young trees.

A seedling heat mat placed beneath your propagation containers keeps the root zone at an ideal 65° to 75° F, which significantly improves rooting success rates during the colder months when you'll be taking your cuttings.

Growing Redwoods from Burl Sprouts

Coast redwood burls offer another accessible path to cloning. These knobby growths contain dense clusters of suppressed buds that activate when separated from the parent tree and exposed to moisture and light. You've probably seen small redwood burls sold in gift shops along the California coast, often marketed as novelty items that sprout when placed in water.

To grow a tree from burl tissue:

• Place the burl in a shallow dish of water with the flattest side down, keeping the water level at about 1/3 the height of the burl
• Set it in a bright, warm spot with indirect sunlight
• Change the water every two to three days to prevent stagnation and mold
• Watch for green shoots to emerge within 2 to 6 weeks
• Once shoots are several inches tall with visible leaf growth, transplant the burl into a pot with moist, acidic potting soil
• Gradually transition the young tree outdoors over several weeks

The trees produced from burls are genetic clones of whichever tree the burl came from. However, burls from roadside gift shops have often been stored dry for extended periods, which reduces their viability. Fresher burl material from a known source tree gives much better results.

Why Cloning Ancient Redwoods Matters for Conservation

Organizations like the Archangel Ancient Tree Archive have turned redwood cloning into a conservation mission. Their team identifies the largest, oldest, and most genetically resilient coast redwoods and giant sequoias, collects tissue samples (often by climbing hundreds of feet into the canopy), and propagates clones through advanced tissue culture methods.

These cloned trees carry the genetics of champions — individuals that survived centuries of drought, disease, fire, and climate shifts. By planting clones of these proven survivors in new locations, conservationists aim to establish forests with exceptional genetic resilience. Thousands of cloned ancient redwoods have already been planted in locations across the United States, Australia, and several European countries.

The work also serves as a form of genetic insurance. Many ancient redwoods exist as single individuals. If one of these trees is lost to wildfire, lightning, or disease, its unique genetic lineage disappears permanently — unless clones have been preserved elsewhere.

Challenges and Limitations of Redwood Cloning

Cloning redwoods isn't without significant obstacles. Mature tissue from old trees is notoriously difficult to root. The cells in an 800-year-old redwood's canopy have undergone a process called maturation, which makes them far less responsive to rooting hormones compared to juvenile tissue. This is why propagators target the youngest growth possible, particularly basal sprouts and epicormic shoots near the base of the trunk.

Giant sequoias present an even greater challenge. Their extremely limited natural sprouting ability means fewer starting points for vegetative propagation. Success rates for giant sequoia cuttings are lower than coast redwoods, and the trees take longer to develop robust root systems. Most commercially available giant sequoias are grown from seed rather than clones.

Environmental matching also matters. A cloned coast redwood planted in a hot, arid climate far from its native fog belt will struggle regardless of its genetics. These trees evolved to capture moisture from coastal fog through their needles, and they depend on the cool, humid conditions of the Pacific Northwest to thrive. A plant moisture meter helps monitor soil conditions when growing young cloned redwoods outside their native range.

Caring for a Young Cloned Redwood

Once your cutting or burl has rooted successfully, the young tree needs specific care to establish itself. Keep the soil consistently moist but never waterlogged — redwoods drink heavily but are susceptible to root rot in standing water. A well-draining acidic soil with a pH between 5.5 and 6.5 mimics their native forest floor conditions.

Young cloned redwoods prefer:

• Partial shade for the first 1 to 2 years, gradually transitioning to full sun
• Regular misting or ambient humidity, especially in dry climates
• Protection from hard freezes during their first winter — a plant frost protection cover shields young trees during unexpected cold snaps
• Minimal fertilization during the first year, then a gentle acidic fertilizer applied in early spring
• Mulch around the base to retain soil moisture and regulate root temperature

Coast redwoods grow rapidly once established, often adding 3 to 5 feet per year in favorable conditions. Within a decade, a cloned tree from a cutting can reach 30 to 50 feet tall. Giant sequoias grow more slowly at first but accelerate after their root systems mature. Dawn redwoods split the difference, growing quickly in youth and topping out at a more manageable size for residential landscapes.

Growing Redwoods Outside Their Native Range

People successfully grow coast redwoods and giant sequoias far beyond California and Oregon. Cloned and seed-grown redwoods now thrive in parts of the Pacific Northwest, the British Isles, New Zealand, Portugal, and the southeastern United States. The key factors are adequate rainfall or irrigation, mild winters, and protection from sustained freezing temperatures during the tree's first few years.

Coast redwoods do surprisingly well in parts of the southeastern US where summer humidity partially compensates for the absence of coastal fog. Giant sequoias tolerate cold better than coast redwoods and have been grown successfully in USDA Zone 6 with winter temperatures dipping below 0° F. Dawn redwoods handle the broadest range of climates, surviving winters as far north as southern Canada.

If you're growing a cloned redwood in a container before planting it outdoors, choose a deep pot with excellent drainage. Redwoods develop strong taproots quickly, and a container that restricts downward root growth can cause the tree to become root-bound within a single growing season.