Giant Sequoia

The most massive living organism by volume, giant sequoias are remarkably adaptable garden trees far outside their native Sierra Nevada range. They grow moderately fast, adding two to three feet per year, and develop the characteristic thick, spongy cinnamon bark within a few decades. Giant sequoias are surprisingly cold-hardy and grow successfully in much of the temperate world with adequate moisture. Give them ample space, as even garden specimens can reach impressive proportions within a human lifetime.

Extract seeds from dried cones by shaking or tapping over a clean surface. Seeds are tiny, averaging 90,000 per pound, with viability rates typically between 10 and 30 percent. Cold-stratify seeds for 30 to 60 days in moist peat at 35 to 40 degrees Fahrenheit to improve germination. Sow on the surface of a fine, well-drained seedling mix under bright indirect light at 65 to 70 degrees. Keep consistently moist with bottom watering or misting. Germination occurs in 2 to 4 weeks. Seedlings are small and slow-growing the first year, reaching 3 to 6 inches. Provide light shade and protect from drying winds. Transplant to individual pots in the second year and grow for 2 to 3 years before planting in the landscape.

The Season Plate

Your Giant Sequoia Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Giant Sequoia Mar – Apr, pick —. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – Apr

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Mar 12

≈ 3650 days from sowing · 1,500 to per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Giant Sequoia reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Prefer email? Get monthly reminders in the Almanac

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Giant sequoia is far more adaptable than its limited native range in the Sierra Nevada might suggest. It grows successfully across much of the temperate world from Britain to New Zealand, tolerating temperatures well below zero degrees Fahrenheit once established. Choose a site with full sun and deep, well-drained soil that can accommodate eventual massive proportions. Space at least 40 feet from structures, utilities, and other large trees.

Plant container-grown specimens in spring. Dig a wide, shallow hole and set the root ball at grade level. Backfill with unamended native soil, water deeply, and mulch with 4 inches of bark or wood chips in a wide circle. Water weekly during the first two growing seasons and during extended dry periods thereafter.

Giant sequoia grows 2 to 3 feet per year in favorable conditions and develops its characteristic columnar to conical shape naturally without pruning. The thick, spongy, reddish-brown bark becomes deeply furrowed with age and provides insulation against fire and cold. Lower branches may be removed for clearance but avoid heavy crown reduction. These are extremely long-lived trees that may grow for thousands of years, so consider the planting location as truly permanent.

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Giant sequoia adapts to a range of well-drained soils from sandy loam to clay loam with a preferred pH of 5.5 to 7.5. It is more tolerant of neutral to slightly alkaline soils than coast redwood. Amend heavy clay soils with organic matter to improve drainage before planting. Apply a balanced slow-release fertilizer annually in early spring for the first 5 to 10 years, then discontinue as the extensive root system accesses deep soil nutrients. Maintain a 4 to 6 inch mulch ring extending to the drip line to conserve moisture and protect feeder roots. Avoid compacting soil in the root zone from foot traffic, vehicles, or construction.

Ideal Temperature

Hardiness Zone Compatibility

Giant sequoias are not harvested for timber or food in landscape settings. Their primary value is ornamental and historical. Small oval cones 2 to 3 inches long can be collected for seed extraction or decoration. Cones may remain green and closed on the tree for up to 20 years, releasing seeds only after fire, drought stress, or the chewing of Douglas squirrels. In cultivation, cut fresh cones from branches in fall and dry them indoors to release the tiny winged seeds.

Storage & Preservation

Giant sequoia cones collected for seed should be placed in paper bags and dried at room temperature for 2 to 4 weeks until they open and release seeds. Clean seeds by sifting and winnowing to remove chaff and empty seed coats. Store viable seeds in sealed containers in the refrigerator where they remain viable for 5 years or more. The thick, fibrous bark of mature trees has historically been used for insulation and as a novelty material, but landscape specimens should never be stripped of bark as this exposes them to pests and diseases.

Troubleshooting Common Problems

Drought stress is the primary challenge for giant sequoias outside their native range. They require deep, infrequent watering during dry periods even when fully established. Young trees are vulnerable to frost damage in their first few winters in marginal climates; wrapping the trunk and mulching heavily helps protect them. Lightning strikes can damage tall specimens. The massive root system can heave sidewalks, driveways, and foundations if planted too close to structures. Foliage may brown temporarily during extreme cold snaps but typically recovers in spring.

Growing Tips

1. Select a planting site with full sun exposure and deep, well-draining loamy soil, allowing a minimum clearance of 15 meters from buildings and other structures to accommodate the mature root spread and canopy.
2. Stratify seeds by placing them in a sealed plastic bag with damp sand or peat moss in the refrigerator at 1 to 4 degrees Celsius for six to eight weeks before sowing to break dormancy.
3. Sow seeds on the surface of a fine-textured seed-starting mix and press gently without covering, as giant sequoia seeds require light for germination and should not be buried.
4. Maintain consistent moisture for seedlings without waterlogging, using a misting system or bottom watering to prevent damping-off disease, which is the primary killer of young sequoia seedlings.
5. Provide partial shade for seedlings during their first summer, gradually increasing sun exposure over the first two years to harden them off before transplanting to a permanent full-sun location.
6. Water young trees deeply once or twice per week during dry periods for the first five to ten years after transplanting, then reduce supplemental irrigation as the root system becomes established.
7. Apply a 7 to 10 centimeter layer of organic mulch such as wood chips or bark around the base of the tree, maintaining a 15 centimeter gap between the mulch and the trunk to prevent moisture-related bark rot.
8. Avoid heavy pruning of living branches, as giant sequoias naturally shed lower limbs. Only remove dead, damaged, or diseased wood, and make clean cuts just outside the branch collar to promote proper wound closure.
9. Protect young trees from deer browsing and rodent girdling by installing wire mesh guards around the trunk during the first several years of growth in areas with significant wildlife pressure.
10. Test soil pH and aim for slightly acidic to neutral conditions between 5.5 and 7.5. Giant sequoias are adaptable to various soil types but perform best in deep, fertile, well-drained loam with good moisture retention.