North America Native Plant

Milk-berry

Botanical name: Sideroxylon americanum

USDA symbol: SIAM2

Life cycle: perennial

Habit: shrub

Native status: Native to Navassa Island  

Synonyms: Bumelia americana (Mill.) Stearn (BUAM5)  âš˜  Bumelia navassana Urb. & Ekman (BUNA2)   

Milk-Berry: A Caribbean Island Treasure You Can’t Grow in Your Garden Meet the milk-berry (Sideroxylon americanum), one of nature’s most exclusive plants – so exclusive, in fact, that you’ll never find it at your local nursery. This remarkable shrub belongs to an elite group of plants that call only one ...

Milk-Berry: A Caribbean Island Treasure You Can’t Grow in Your Garden

Meet the milk-berry (Sideroxylon americanum), one of nature’s most exclusive plants – so exclusive, in fact, that you’ll never find it at your local nursery. This remarkable shrub belongs to an elite group of plants that call only one place on Earth home, making it both fascinating and heartbreakingly rare.

What Makes Milk-Berry So Special?

The milk-berry is a perennial shrub that typically grows as a multi-stemmed woody plant, usually reaching heights of 13 to 16 feet under ideal conditions. Like other shrubs, it develops several stems from or near the ground, creating a bushy appearance that would be lovely in any landscape – if only we could grow it!

You might also see this plant referenced by its former scientific names, including Bumelia americana and Bumelia navassana, as botanical classifications have evolved over time.

A Plant with an Extremely Limited Address

Here’s where things get really interesting (and a bit sad): Sideroxylon americanum is native exclusively to Navassa Island, a tiny uninhabited speck of land in the Caribbean Sea between Jamaica and Haiti. This 2-square-mile island is the entire world range for this species – talk about putting all your eggs in one basket!

Why You Can’t (and Shouldn’t Try to) Grow Milk-Berry

If you’re thinking about adding milk-berry to your native plant garden, I hate to be the bearer of disappointing news, but this simply isn’t possible for several important reasons:

  • Extreme rarity: This species is so rare that it may actually be extinct in the wild
  • Unavailable in trade: You won’t find this plant at any nursery or through any legitimate plant supplier
  • Unknown growing requirements: Since it’s found only on one remote island, we don’t have reliable information about its specific growing needs
  • Conservation concerns: Any remaining plants need protection in their native habitat

What This Means for Conservation-Minded Gardeners

While you can’t grow milk-berry in your garden, its story serves as a powerful reminder of why native plant gardening matters. When we choose native plants for our own regions, we’re supporting biodiversity and helping prevent other species from facing the same precarious situation as milk-berry.

Instead of milk-berry, consider these actions:

  • Research native shrubs in your area that provide similar ecological benefits
  • Support organizations working to protect rare and endangered plants
  • Choose locally native plants that support your regional wildlife
  • Learn about other rare plants in your area that might need protection

The Bigger Picture

Sideroxylon americanum represents something both beautiful and sobering about our natural world – the incredible diversity that exists, and how fragile that diversity can be. While we can’t bring milk-berry into our gardens, we can honor its legacy by making thoughtful choices about the native plants we do cultivate.

Every native plant we choose for our gardens is a small act of conservation, supporting the intricate web of relationships between plants, pollinators, and wildlife that make our ecosystems thrive. So while milk-berry remains out of reach, there’s a whole world of native plants waiting to make your garden both beautiful and ecologically valuable.

Milk-berry

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Ebenales

Family

Sapotaceae Juss. - Sapodilla family

Genus

Sideroxylon L. - bully

Species

Sideroxylon americanum (Mill.) T.D. Penn. - milk-berry

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