North America Non-native Plant

Solanum Guamense

Botanical name: Solanum guamense

USDA symbol: SOGU4

Native status: Not native but doesn't reproduce and persist in the wild

Solanum guamense: A Critically Rare Native Worth Protecting When it comes to native plants that capture the attention of conservation botanists, few are as enigmatic as Solanum guamense. This member of the nightshade family represents one of nature’s rarest treasures, and understanding its story helps us appreciate the delicate balance ...

Rare plant alert!

Region: United States

Status: Endangered: Status is uncertain but is somewhere between the following rankings: Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Solanum guamense: A Critically Rare Native Worth Protecting

When it comes to native plants that capture the attention of conservation botanists, few are as enigmatic as Solanum guamense. This member of the nightshade family represents one of nature’s rarest treasures, and understanding its story helps us appreciate the delicate balance of island ecosystems.

What Makes This Plant So Special?

Solanum guamense belongs to the same genus as familiar garden favorites like tomatoes, potatoes, and eggplants. However, unlike its well-known relatives, this species is endemic to Guam and carries the sobering distinction of being listed as Endangered in the United States. The species name guamense tells us exactly where this plant calls home – the small Pacific island of Guam.

Geographic Distribution and Rarity

This rare nightshade is found exclusively on Guam, making it what botanists call an endemic species. Endemic plants are particularly vulnerable because they exist nowhere else on Earth, and any threats to their specific habitat can potentially wipe them out entirely.

Why You Won’t Find This in Garden Centers

Here’s the important part for gardeners: Solanum guamense is not a plant you should attempt to grow, and here’s why:

  • Its Endangered status means it requires specialized conservation efforts
  • Very little is known about its specific growing requirements
  • It may be extremely rare or possibly extinct in the wild
  • Any cultivation should only be done by qualified botanical institutions

Conservation Matters More Than Cultivation

Instead of thinking about growing Solanum guamense, we should focus on supporting conservation efforts for rare island plants. The loss of endemic species like this represents an irreplaceable loss of biodiversity. Island plants often evolve unique characteristics that help them survive in specific conditions, and once they’re gone, that genetic diversity is lost forever.

Better Alternatives for Your Garden

If you’re interested in growing native Solanum species, consider these more widely available options that won’t put rare plants at risk:

  • Research native nightshades in your specific region
  • Contact local native plant societies for recommendations
  • Choose well-documented native species with stable populations
  • Support conservation organizations working to protect rare plants

The Bigger Picture

Plants like Solanum guamense remind us that native gardening isn’t just about what we can grow – it’s also about what we choose to protect. By focusing our garden efforts on stable native species and supporting conservation of rare ones, we can be responsible stewards of plant diversity.

While we may never see Solanum guamense thriving in our gardens, we can honor its existence by making thoughtful choices about the native plants we do grow and by supporting the scientists and conservationists working to understand and protect the world’s rarest species.

Solanum Guamense

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

Solanales

Family

Solanaceae Juss. - Potato family

Genus

Solanum L. - nightshade

Species

Solanum guamense Merr.

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