North America Non-native Plant

Rhamnus Crocea Insula

Botanical name: Rhamnus crocea insula

USDA symbol: RHCRI5

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

Synonyms: Rhamnus insula Kellogg (RHIN19)   

Rhamnus crocea insula: A Rare Native Plant Worth Knowing About If you’ve stumbled across the name Rhamnus crocea insula in your native plant research, you’ve discovered one of those botanical mysteries that keeps plant enthusiasts on their toes. This particular plant is something of an enigma in the gardening world ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2T3: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Rhamnus crocea insula: A Rare Native Plant Worth Knowing About

If you’ve stumbled across the name Rhamnus crocea insula in your native plant research, you’ve discovered one of those botanical mysteries that keeps plant enthusiasts on their toes. This particular plant is something of an enigma in the gardening world – it’s rare enough that even finding reliable growing information can be quite the adventure!

What We Know About This Elusive Plant

Rhamnus crocea insula goes by the synonym Rhamnus insula Kellogg, which gives us a hint about its taxonomic history. What makes this plant particularly noteworthy is its conservation status. With a Global Conservation Status of S5T2T3, this indicates that while it may be secure in some areas, it’s quite rare to imperiled in others – definitely not your everyday garden center find!

Geographic Distribution and Native Status

Unfortunately, specific information about where Rhamnus crocea insula naturally occurs is limited in available resources. This lack of readily available information actually tells us something important: this is likely a very localized or rare subspecies that hasn’t been extensively studied or documented in popular gardening literature.

The Rarity Factor: Why This Matters to Gardeners

Here’s where things get important for responsible gardeners. The S5T2T3 conservation ranking is a red flag that should make us pause and think carefully. This status suggests the plant is:

  • Potentially rare or uncommon in its native habitat
  • Possibly vulnerable to population decline
  • In need of conservation consideration

If you’re interested in growing Rhamnus crocea insula, the golden rule is this: only obtain plants or seeds from reputable, responsible sources that can verify the material wasn’t collected from wild populations. Never collect from the wild, and always ensure any nursery stock comes with proper documentation about its propagation history.

Growing Information: The Challenge

Here’s the honest truth – specific growing requirements, USDA hardiness zones, and detailed care instructions for Rhamnus crocea insula are remarkably scarce in available literature. This scarcity itself suggests a few possibilities:

  • The plant may be extremely localized to specific microclimates
  • It might have very particular growing requirements that make cultivation challenging
  • It could be so rare that few people have attempted to grow it

Should You Grow It?

Given the conservation concerns and limited growing information, Rhamnus crocea insula isn’t the best choice for most home gardeners. Instead, consider these alternatives:

  • Research other Rhamnus species that are more readily available and well-documented
  • Contact local native plant societies or botanical gardens for guidance
  • Focus on other native plants with similar characteristics but better availability
  • Support conservation efforts for rare plants like this one

The Bottom Line

While Rhamnus crocea insula is undoubtedly an interesting plant from a botanical perspective, it’s probably not destined for most home gardens. Its rarity status means we should treat it with the respect it deserves – admiring it from afar and supporting conservation efforts rather than trying to cultivate it ourselves.

If you’re passionate about growing rare native plants, connect with botanical institutions, native plant societies, and conservation organizations. They can guide you toward rare plants that can be responsibly cultivated and may even have conservation propagation programs you can support.

Sometimes the most responsible thing a plant lover can do is appreciate a species for what it is – a unique part of our natural heritage that’s best left to thrive in its native habitat.

Rhamnus Crocea Insula

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Rhamnales

Family

Rhamnaceae Juss. - Buckthorn family

Genus

Rhamnus L. - buckthorn

Species

Rhamnus crocea Nutt. - redberry buckthorn

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