How to Grow Hawaiian Tree Fern

Wikimedia Commons

Hawaiian Tree Fern

Cibotium glaucum

fern

Hawaiian Tree Fern is a large, dramatic tropical fern native to the Hawaiian Islands, characterized by a thick trunk and massive fronds that can reach 6-9 feet long. It creates a lush, prehistoric appearance in shaded garden settings and is prized for its architectural form and tropical aesthetic. This fern thrives in humid, sheltered environments and makes an excellent specimen plant for gardens in warm climates.

When should you plant Hawaiian Tree Fern in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Hawaiian Tree Fern timeline →

Example Hawaiian Tree Fern timeline · Pittsburgh, PA (Zone 6b)

Plant Hawaiian Tree Fern
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Hawaiian Tree Fern
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Hawaiian Tree Fern dates for your own zip code.

Growing Conditions

☀️

Sun: Dappled shade to partial shade; 2-4 hours indirect light daily; avoid full sun which causes frond damage

💧

Water: Keep soil consistently moist but not waterlogged; requires high humidity (60-80%); mist fronds regularly; water at soil level to avoid crown rot

📏

Spacing: 48 inches

📅

Days to maturity: 1825-3650 (3-10 years to reach mature size)

🌱

Planting depth: Crown at soil level; do not bury the trunk

Soil

Type: Rich, organic, well-draining soil with high humus content

pH: 5.5-7.0

Amendments:

Peat moss or coco coir Compost Orchid bark Leaf mold

Growing Zones

Find your zone →

Zones 10b-11; can be grown in zone 10a with protection

10b 11a 11b

Get my Hawaiian Tree Fern timeline →

Growth Stages

Establishment

6-12 months

Young fern with emerging fronds, typically 1-2 feet tall

Plant in rich organic soil; maintain high humidity; avoid transplanting; protect from wind and direct sun; mist daily

Juvenile Growth

1-3 years

Trunk becomes visible, fronds gradually lengthen to 3-4 feet

Maintain consistent moisture; continue regular misting; support with stake if needed; fertilize monthly with diluted balanced fertilizer

Developing Canopy

2-5 years

Trunk thickens, fronds reach 4-6 feet, creating umbrella-like silhouette

Reduce staking as trunk strengthens; continue humidity management; remove dead fronds; fertilize during growing season

Mature Form

Ongoing (5+ years)

Full canopy of 6-9 foot fronds, thick trunk, imposing architectural presence

Maintain moisture and humidity; remove only dead fronds; limit fertilization; monitor for pests in humid conditions

Companion Planting

Plan your garden →

Plant with:

Heliconia Ginger Bird of Paradise Bromeliads Plumbago Philodendron Shade-tolerant palms Begonias

Avoid planting near:

Dry-loving succulents Full-sun plants requiring low humidity Plants requiring well-draining sandy soil Drought-tolerant Mediterranean herbs

Common Pests

Spray with horticultural oil or insecticidal soap; inspect regularly on fronds and trunk
Increase humidity through misting; spray with water to dislodge; use miticide if severe
Remove with alcohol-soaked cotton swab; spray with neem oil; improve air circulation
Ensure well-draining soil; avoid overwatering; improve drainage; repot if necessary
and
Hand-pick in early morning; reduce mulch depth near trunk; use copper barriers

Uses

🏠

Living Landscape Sculpture

Household

Creates dramatic focal points in tropical and subtropical gardens, bringing prehistoric elegance to outdoor spaces. The architectural form provides year-round visual interest and shade structure. [source]

🎨

Cut Frond Arrangements

Craft

Large fronds are occasionally used in floral arrangements and tropical decorations, adding exotic texture and scale to indoor displays. [source]

🦋

Tropical Habitat Creation

Wildlife

Provides shelter and humid microhabitats for tropical birds, insects, and amphibians, supporting biodiversity in residential gardens. [source]

🏠

Air Purification and Humidity Regulation

Household

Ferns, including tree ferns, actively transpire moisture and filter air in humid environments, improving indoor air quality when grown as houseplants in conservatories. [source]

💊

Traditional Hawaiian Uses

Medicinal

Historically used in Hawaiian medicine and culture; fronds have been used in traditional remedies and cultural practices. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Hawaiian Tree Ferns are ornamental plants, not harvested for food. Remove dead or damaged fronds at the base near the trunk throughout the year. Do not cut living green fronds as they are essential for photosynthesis and plant vigor.

Fun Facts

🌱 Hawaiian Tree Fern can take 5-10 years to reach its mature height of 20-30 feet in ideal conditions, making it a true long-term landscape investment.
🌱 The trunk is not made of wood but consists of densely packed fiber and aerial roots, making it surprisingly lightweight despite its large size.
🌱 In Hawaii, these ferns are sacred in some cultural traditions and were historically used to construct the trunks of Hawaiian houses called hale.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Crown Full Sun Partial Shade pH Transplant

Shop Hawaiian Tree Fern plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Hawaiian Tree Fern planting timeline

Tell us your zip code and we'll calculate exactly when to start Hawaiian Tree Fern seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Hawaiian Tree Fern timeline →