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How to Grow Scabland dubautia

Scabland dubautia

Dubautia scabra subsp. scabra

shrub

Dubautia scabra subsp. scabra is a rare Hawaiian endemic shrub found in the volcanic scablands of the Big Island of Hawaii. This small, woody shrub is adapted to harsh, rocky lava fields with minimal soil development. It is a member of the Asteraceae family and represents an important part of Hawaii's unique native flora.

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Example Scabland dubautia timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Scabland dubautia

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Scabland dubautia

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Scabland dubautia dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily; tolerates harsh, exposed conditions
💧
Water: Low water needs once established; drought-tolerant. Water moderately during establishment, then minimize supplemental watering to mimic natural volcanic scabland habitat.
📏
Spacing: 18-24 inches
📅
Days to maturity: Not applicable for ornamental; mature size reached in 3-5 years
🌱
Planting depth: Shallow planting; place root ball slightly above soil level to ensure excellent drainage

Soil

Type: Well-draining volcanic or rocky soil with low organic matter
pH: 6.5-7.5
Amendments:
Perlite or pumice for drainage Minimal compost needed; plant tolerates nutrient-poor soil

Growing Zones

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Thrives in USDA zone 11 (Hawaii and similar tropical climates)

11

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Growth Stages

1

Seedling/Propagule

4-6 weeks

Small tender shoots emerging from seed or cuttings with delicate foliage

Provide bright indirect light, maintain consistent but not wet soil moisture, protect from strong wind and full sun exposure until established

2

Establishment

3-6 months

Young plant develops deeper root system and more robust woody stems; foliage becomes tougher

Gradually acclimate to full sun and drought conditions, reduce watering frequency, apply light mulch around base to retain initial moisture

3

Vegetative Growth

Ongoing, 2-5 years

Mature shrub develops dense, woody branching with small, scabrous (rough) leaves typical of the species

Minimal intervention needed; allow natural form to develop, prune only to remove dead or damaged wood

4

Flowering

2-4 months (variable by season)

Small yellow or white composite flowers appear clustered at branch tips, typical of Asteraceae family

Maintain drought conditions to encourage flowering; avoid excess nitrogen fertilization

5

Seed Development & Maturity

1-2 months

Flowers mature into small seedheads with dispersal mechanisms adapted to wind

Allow seedheads to develop naturally; collect seeds if propagation desired

Companion Planting

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Plant with:

Santalum paniculatum (Hawaiian sandalwood) Erythrina sandwicensis (Wiliwili) Chenopodium oahuense (Hawaiian goosefoot) Other Hawaiian endemic shrubs and succulents adapted to volcanic scabland

Avoid planting near:

Water-loving plants requiring consistent moisture Aggressive non-native invasive species Plants requiring rich, amended soils

Common Pests

  • Spray with water to increase humidity; use insecticidal soap if severe; maintain air circulation

  • Remove by hand, apply horticultural oil in early morning or late afternoon

  • Yellow sticky traps, insecticidal soap, or neem oil spray

Uses

🦋

Native Hawaiian Pollinator Support

Wildlife

Dubautia scabra provides nectar and pollen for native Hawaiian insects and birds, supporting endemic pollinator populations in its restricted range. [source]

🏠

Drought-Tolerant Ornamental

Household

Ideal for xeriscaping and low-maintenance Hawaiian native gardens, conservation collections, and botanical institutions studying endemic species. [source]

🎨

Conservation & Habitat Restoration

Craft

Important species for volcanic scabland habitat restoration projects and Hawaiian native plant conservation programs. [source]

Harvest Tips

This is an ornamental native plant, not typically harvested. Seeds may be collected when seedheads mature and dry if propagation is desired. Handle carefully as this is a rare Hawaiian endemic; cultivate only as a conservation or ornamental specimen.

Fun Facts

  • 🌱 Dubautia is a Hawaiian endemic genus found only in the Hawaiian Islands, with Dubautia scabra being one of the rarest subspecies adapted to harsh, barren lava fields.
  • 🌱 The name 'scabra' refers to the rough, scabrous texture of the leaves, a adaptation to the harsh volcanic environment.
  • 🌱 This plant represents millions of years of adaptive radiation and speciation in Hawaii's unique island ecosystem, making it a living example of evolutionary processes.

Gardening Terms

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

Full Sun Mulch Native Plant
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