North America Native Plant

Ralm

Botanical name: Neuburgia celebica

USDA symbol: NECE

Native status: Native to Pacific Basin excluding Hawaii  

Ralm (Neuburgia celebica): A Rare Pacific Island Native Worth Knowing If you’re passionate about native plants and have a thing for botanical rarities, you might have stumbled across the intriguing Neuburgia celebica, commonly known as ralm. This Pacific island native is one of those plants that makes you feel like ...

Ralm (Neuburgia celebica): A Rare Pacific Island Native Worth Knowing

If you’re passionate about native plants and have a thing for botanical rarities, you might have stumbled across the intriguing Neuburgia celebica, commonly known as ralm. This Pacific island native is one of those plants that makes you feel like you’re part of an exclusive club – mainly because there’s so little information floating around about it!

What is Ralm?

Ralm (Neuburgia celebica) is a native plant species that calls the western Pacific home. In Palau, locals also know it as kalm, which gives you a hint about how regional plant names can vary even within a species’ native range. This plant belongs to the dicot group, but beyond that basic classification, ralm keeps many of its secrets close to the vest.

Where Does Ralm Grow Naturally?

Neuburgia celebica has carved out its niche in the Pacific Basin, specifically thriving in Guam and Palau. These tropical island locations suggest that ralm has adapted to warm, humid conditions typical of Pacific island environments. The plant is notably absent from Hawaii, despite the state’s similar climate, which tells us something about how specific this species’ habitat requirements might be.

Should You Try Growing Ralm?

Here’s where things get interesting – and a bit challenging. Ralm falls into that category of plants that serious native plant enthusiasts dream about but rarely get to grow. The lack of readily available information about its growing conditions, care requirements, and propagation methods makes it a tough candidate for the average home gardener.

If you’re considering ralm for your garden, here are some important points to consider:

  • Limited availability: You’re unlikely to find ralm at your local nursery
  • Unknown growing requirements: Without clear guidance on soil, water, and light needs, success isn’t guaranteed
  • Conservation concerns: The scarcity of information suggests this might be a rare species that should be left undisturbed in its native habitat
  • Climate restrictions: Unless you live in a tropical climate similar to Guam or Palau, your growing conditions probably won’t match its natural habitat

The Responsible Gardener’s Approach

Given the mystery surrounding ralm’s cultivation requirements and its limited native range, the most responsible approach is to appreciate this plant from afar. If you’re drawn to Pacific island natives, consider researching and growing better-documented species from similar regions that have established cultivation guidelines.

For gardeners in tropical climates who are determined to work with rare Pacific natives, focus on:

  • Connecting with botanical gardens or research institutions that might have experience with Neuburgia celebica
  • Supporting conservation efforts in Guam and Palau where this species naturally occurs
  • Exploring well-documented native alternatives that can provide similar ecological benefits

The Bottom Line

Ralm represents one of those fascinating botanical puzzles that remind us how much we still don’t know about our planet’s plant diversity. While it might not be the right choice for your weekend gardening project, Neuburgia celebica serves as a perfect example of why protecting natural habitats and supporting botanical research matters.

Sometimes the best way to appreciate a rare native plant is to ensure it continues thriving exactly where nature intended – in its original home among the Pacific islands.

Ralm

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Gentianales

Family

Loganiaceae R. Br. ex Mart. - Logania family

Genus

Neuburgia Blume

Species

Neuburgia celebica (Koord.) Leenh. - ralm

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