North America Native Plant

Caroline Nutmeg

Botanical name: Myristica hypargyraea insularis de

USDA symbol: MYHYI

Life cycle: perennial

Habit: tree

Native status: Native to Pacific Basin excluding Hawaii  

Synonyms: Myristica hypargyraea A. Gray var. insularis (Kaneh.) J. Sinclair (MYHYI2)  âš˜  Myristica insularis Kaneh. (MYIN3)   

Caroline Nutmeg: A Rare Pacific Island Native Worth Knowing About If you’ve ever dreamed of growing something truly unique in your garden, the Caroline nutmeg (Myristica hypargyraea insularis de) might just capture your imagination. This fascinating tree species represents one of nature’s more elusive treasures from the Pacific islands, though ...

Caroline Nutmeg: A Rare Pacific Island Native Worth Knowing About

If you’ve ever dreamed of growing something truly unique in your garden, the Caroline nutmeg (Myristica hypargyraea insularis de) might just capture your imagination. This fascinating tree species represents one of nature’s more elusive treasures from the Pacific islands, though growing it successfully presents some unique challenges that every gardener should understand.

What is Caroline Nutmeg?

Caroline nutmeg belongs to the nutmeg family and is a perennial tree that can grow impressively tall – we’re talking 13 to 16 feet or more under the right conditions. Like its more famous nutmeg relatives, this species typically develops a single strong trunk, though environmental factors can sometimes encourage a more multi-stemmed, shorter growth pattern.

You might also encounter this plant listed under its botanical synonyms, including Myristica hypargyraea var. insularis or Myristica insularis, depending on which reference you’re consulting.

Where Does It Come From?

This tree calls the western Pacific home, specifically thriving in the tropical environments of Guam and Palau. As a native species of the Pacific Basin (excluding Hawaii), it has evolved to flourish in the unique island conditions of this region.

Should You Plant Caroline Nutmeg?

Here’s where things get a bit tricky, and I’ll be completely honest with you. While Caroline nutmeg sounds absolutely fascinating, there’s a significant challenge facing anyone interested in growing this species: reliable information about its cultivation requirements is extremely limited.

This could indicate that the plant is:

  • Quite rare in cultivation
  • Difficult to grow outside its native range
  • Simply not well-documented in horticultural literature

The Reality Check

Without clear information about growing conditions, hardiness zones, care requirements, or even its availability in the nursery trade, Caroline nutmeg falls into that category of plants that are more interesting to learn about than to actually grow. This is particularly true if you’re gardening outside of tropical Pacific island conditions.

If you’re drawn to the idea of growing nutmeg-family plants, you might have better luck with:

  • Other Myristica species that are better documented
  • Native alternatives from your own region
  • Well-established tropical trees that offer similar exotic appeal

A Word of Caution

Given the limited information available about this species, if you do somehow encounter Caroline nutmeg for sale or trade, proceed with extra caution. Make sure you’re getting the plant from a reputable, responsible source, and be prepared for the possibility that it may have very specific requirements that aren’t well-understood outside its native habitat.

The Bottom Line

Caroline nutmeg represents one of those intriguing plants that reminds us how much botanical diversity exists in our world, even if we can’t always bring it into our gardens. While it might not be the practical choice for most gardeners, it certainly adds to our appreciation of the rich plant life found in Pacific island ecosystems.

If you’re passionate about rare plants and have experience with challenging tropical species, Caroline nutmeg might be worth investigating further. Just be prepared for a journey that’s more about discovery and conservation than straightforward gardening success.

Caroline Nutmeg

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Magnoliidae

Order

Magnoliales

Family

Myristicaceae R. Br. - Nutmeg family

Genus

Myristica Gronov. - nutmeg

Species

Myristica hypargyraea A. Gray - silverleaf nutmeg

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