North America Non-native Plant

Citroncirus

Botanical name: ×Citroncirus

USDA symbol: CITRO2

Life cycle: perennial

Habit: tree

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

Citroncirus: Understanding This Unusual Hybrid Tree If you’ve stumbled across the name citroncirus in your gardening research, you might be scratching your head wondering exactly what this plant is. Don’t worry – you’re not alone! Citroncirus (×Citroncirus) is actually a hybrid genus that represents crosses between citrus trees and hardy ...

Citroncirus: Understanding This Unusual Hybrid Tree

If you’ve stumbled across the name citroncirus in your gardening research, you might be scratching your head wondering exactly what this plant is. Don’t worry – you’re not alone! Citroncirus (×Citroncirus) is actually a hybrid genus that represents crosses between citrus trees and hardy orange (Poncirus), making it quite different from your typical native plant options.

What Exactly Is Citroncirus?

Citroncirus is a perennial tree that can grow to impressive heights of 13-16 feet or more. Like other trees, it features a single main trunk (though environmental conditions can sometimes lead to multi-stemmed growth forms). The × symbol in its botanical name is your clue that this is a hybrid – essentially a plant created by crossing two different genera.

Native Status and Distribution

Here’s where things get a bit murky. The native status of citroncirus is currently undefined, and its geographical distribution isn’t well-documented in native plant databases. This is actually quite common with hybrid plants, as they don’t occur naturally in wild ecosystems but are instead created through human intervention or rare natural hybridization events.

Should You Plant Citroncirus in Your Garden?

Given the unclear native status and limited information about this hybrid genus, citroncirus presents some challenges for native plant enthusiasts. Here are some considerations:

  • Unknown ecological benefits to local wildlife and pollinators
  • Unclear adaptation to local growing conditions
  • Limited information about invasive potential
  • Uncertain hardiness zones and care requirements

Better Native Alternatives

Since the goal of native gardening is to support local ecosystems with plants that naturally belong in your area, you might want to consider well-documented native tree species instead. Research native trees in your region that can provide:

  • Food and shelter for local wildlife
  • Support for native pollinators
  • Proven adaptation to your climate
  • Clear growing requirements and care instructions

The Bottom Line

While citroncirus might be an interesting botanical curiosity, the lack of clear information about its native status, ecological benefits, and growing requirements makes it a questionable choice for native gardening projects. Your local native plant society or extension office can help you identify native tree species that will thrive in your area while supporting local wildlife and ecosystems.

Remember, the best native garden is one filled with plants that truly belong in your local environment – and unfortunately, citroncirus doesn’t seem to fit that bill based on current available information.

Citroncirus

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

Sapindales

Family

Rutaceae Juss. - Rue family

Genus

×Citroncirus J.W. Ingram & H.E. Moore - citroncirus

Species

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