Hawaiian Rauvolfia Plant Care

Rauvolfia sandwicensis A.DC.

Updated · Sources · How we source care data

Rauvolfia sandwicensis, the devil's-pepper, also known as hao in the Hawaiian language, is a species of flowering plant in the milkweed family, Apocynaceae, that is endemic to Hawaii. It is a shrub, a small tree reaching 6 m (20 ft) in height, or, rarely, a medium-sized tree up to 12 m (39 ft) tall with a trunk diameter of 0.3 m (0.98 ft).

🌿Shrubs🪴Houseplants🍃Climbers & Vines
Water

Every 7–10 days

Light

Bright indirect to partial shade

Temp

65–80°F

Humidity

50–70%

At a glance

How do you care for Hawaiian Rauvolfia?

Plant Hawaiian Rauvolfia in bright indirect to partial shade (USDA zones 13b) and water a young tree every 7–10 days until it is established. It tolerates temperatures of 65–80°F (18–27°C). Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.

Where Is the Hawaiian Rauvolfia Native To?

Native range1 country

What Is the Hawaiian Rauvolfia?

Hawaiian Rauvolfia (Rauvolfia sandwicensis) belongs to the Apocynaceae family within the Rauvolfia genus. Hawaiian Rauvolfia is native to Hawaii.

Hawaiian Rauvolfia displays an upright, bushy shrub growth habit, reaching up to 5 ft tall with a spread of approximately 3 ft. Hawaiian Rauvolfia produces small tubular white or pink flowers in clusters.

Leaf size: approximately 4 inches.

How Often Should You Water a Hawaiian Rauvolfia?

Water a young or newly planted Hawaiian Rauvolfia every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Watering Frequency

Every 7–10 days

Until established; then in dry spells

What Light Does the Hawaiian Rauvolfia Need?

Hawaiian Rauvolfia thrives in bright indirect to partial shade. Avoid placing Hawaiian Rauvolfia in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Light Requirement

Bright indirect to partial shade

What Temperature and Humidity Does the Hawaiian Rauvolfia Prefer?

Rauvolfia sandwicensis tolerates temperatures of 65–80°F. Hawaiian Rauvolfia prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Temperature

65–80°F

Humidity

50–70%

What Soil Mix Works Best for a Hawaiian Rauvolfia?

Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Hawaiian Rauvolfia to prevent waterlogging, which leads to root rot and fungal issues.

How Often Should You Fertilize a Hawaiian Rauvolfia?

Feed Hawaiian Rauvolfia every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

Fertilizing

Every 6 months

During the growing season

The PlantoScan app can remind you when to water and when to fertilize each plant.

Where Should You Plant a Hawaiian Rauvolfia?

Choose a spot with bright indirect to partial shade and well-draining sandy loam with added organic matter for moisture retention. Avoid low spots where water collects after rain.

Hawaiian Rauvolfia is suited to USDA Zone 13b.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

How Far Apart Should You Plant a Hawaiian Rauvolfia?

Hawaiian Rauvolfia can spread to about 3 ft (0.9 m) and reach about 5 ft (2 m) tall. Space plants about 3 ft (0.9 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the tree spacing calculator.

How Do You Prune a Hawaiian Rauvolfia?

Prune Hawaiian Rauvolfia while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the tree in one year.

How Do You Care for a Hawaiian Rauvolfia in Winter?

Hawaiian Rauvolfia is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

How Do You Propagate a Hawaiian Rauvolfia?

Hawaiian Rauvolfia can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to snake root plant care, which shares the same genus.

Is the Hawaiian Rauvolfia Toxic to Pets and Children?

Toxic (caution)

Reported as toxic in our plant data. Not verified by the ASPCA.

Toxic to humans and pets if ingested

This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.

See all plants toxic to cats and plants toxic to dogs.

What Pests and Diseases Affect the Hawaiian Rauvolfia?

Hawaiian Rauvolfia is susceptible to aphids, spider mites, scale insects. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

What USDA Hardiness Zone Does the Hawaiian Rauvolfia Need?

Hawaiian Rauvolfia grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Hawaiian Rauvolfia is native to Hawaii. In cooler regions, grow Hawaiian Rauvolfia as a houseplant or bring it indoors before the first frost.

Hardiness Zone

Zone 13b

Keep exploring plants

Hawaiian Rauvolfia is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.

It belongs to the Rauvolfia genus — compare its care with other Rauvolfia species on PlantoScan.

Rauvolfia is part of the Apocynaceae plant family — browse all Apocynaceae genera and species.

Hawaiian Rauvolfia thrives in bright light and direct sun — see other bright-light plants.

More Rauvolfia Species

Other Rauvolfia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:

Sources

  • Scientific name & taxonomy: Rauvolfia sandwicensis A.DC., family Apocynaceae (first published in Prodr. 8: 339 (1844)) — World Flora Online record, IPNI name record.
  • Pet toxicity: Hawaiian Rauvolfia is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
  • Hardiness zone: USDA Zone 13b, calculated from the plant's minimum temperature.
  • Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.

Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.

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