Native Plants

Caroline Ivory Nutpalm

Metroxylon amicarum

USDA symbol: MEAM4

Pacific Basin excluding Hawaii: native

Meet the Caroline ivory nutpalm (Metroxylon amicarum), one of the Pacific’s most fascinating and rare palm species. This remarkable tree isn’t your average backyard palm – it’s a living piece of Micronesian heritage that brings both beauty and botanical significance to the right garden setting. The Caroline ivory nutpalm gets ...

Caroline Ivory Nutpalm: A Rare Pacific Treasure for Tropical Gardens

Meet the Caroline ivory nutpalm (Metroxylon amicarum), one of the Pacific’s most fascinating and rare palm species. This remarkable tree isn’t your average backyard palm – it’s a living piece of Micronesian heritage that brings both beauty and botanical significance to the right garden setting.

What Makes the Caroline Ivory Nutpalm Special?

The Caroline ivory nutpalm gets its intriguing name from the ivory-colored endosperm found in its seeds, which historically had cultural and practical uses in its native islands. This isn’t just another pretty palm face in the crowd – it’s a conversation starter with a story to tell.

You might also encounter this palm listed under its synonym, Coelococcus amicarum, in older botanical references or specialty nursery catalogs.

Where Does It Call Home?

This palm is native to the Pacific Basin, specifically calling the Caroline Islands of Micronesia home. Today, you’ll find it naturally growing in Palau and historically documented in Guam, though its presence there may be quite limited now.

  • Species observed
  • No observations

A Rare Beauty Worth Protecting

Here’s where things get serious, fellow plant lovers. The Caroline ivory nutpalm has an extremely limited native range, which makes it quite rare in the wild. If you’re considering adding this stunning palm to your collection, please – and we can’t stress this enough – only source it from reputable nurseries that practice responsible propagation. Wild collection of this species could further threaten its already limited populations.

Is This Palm Right for Your Garden?

Let’s be honest: this isn’t a palm for everyone or everywhere. The Caroline ivory nutpalm is strictly a tropical zones 11-12 plant, which means unless you’re gardening in the most consistently warm, humid climates, you’ll need a heated greenhouse to keep this beauty happy.

Perfect Garden Settings:

  • Tropical botanical gardens and collections
  • Large residential landscapes in tropical zones
  • Specialty palm collections
  • Educational gardens showcasing Pacific Island flora

Growing Your Caroline Ivory Nutpalm Successfully

If you’re lucky enough to live in the right climate zone and can source this palm responsibly, here’s how to help it thrive:

Growing Conditions:

  • Climate: Tropical, humid conditions year-round
  • Light: Partial shade to full sun (afternoon shade appreciated in hottest climates)
  • Soil: Well-draining, rich organic matter
  • Water: Consistent moisture without waterlogging

Planting and Care Tips:

  • Plant in a location protected from strong winds
  • Apply palm-specific fertilizer regularly during growing season
  • Maintain consistent soil moisture, especially during dry periods
  • Mulch around the base to retain moisture and regulate soil temperature
  • Be patient – palms are naturally slow growers

Wildlife and Pollinator Benefits

Like most palms, the Caroline ivory nutpalm produces flowers that attract various flying insects, contributing to your garden’s pollinator ecosystem. The specific wildlife benefits in its native range include providing habitat and food sources for local bird species.

The Bottom Line

The Caroline ivory nutpalm is undeniably captivating and would make an extraordinary addition to the right tropical garden. However, its rarity means it comes with responsibility. Only consider this palm if you can provide the specific tropical conditions it needs and can source it from ethical, conservation-minded suppliers.

For most gardeners, especially those outside tropical zones, consider exploring other native palm options for your region instead. But if you’re a serious palm collector in the right climate with access to responsibly propagated plants, the Caroline ivory nutpalm could be the crown jewel of your tropical landscape.

Metroxylon amicarum is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Metroxylon amicarum is also known as:

Coelococcus amicarum | USDA symbol: COAM7

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Monocot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Monocotyledons
Subclass: Arecidae
Order: Arecales
Family: Arecaceae Bercht. & J. Presl - Palm family
Genus: Metroxylon Rottb. - metroxylon

Species: Metroxylon amicarum (H.A. Wendl.) Becc. - Caroline ivory nutpalm

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA