North America Non-native Plant

Diaz Bluestem

Botanical name: Dichanthium annulatum var. annulatum

USDA symbol: DIANA

Habit: grass

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

Synonyms: Andropogon annulatus Forssk. (ANAN12)  ⚘  Andropogon nodosus (Willem.) Nash (ANNO4)   

Diaz Bluestem: A Lesser-Known Grass with Limited Information If you’ve stumbled across the name Diaz bluestem while researching native plants, you’re not alone in finding limited information about this grass species. Scientifically known as Dichanthium annulatum var. annulatum, this graminoid (grass-like plant) belongs to the extensive grass family, but details ...

Diaz Bluestem: A Lesser-Known Grass with Limited Information

If you’ve stumbled across the name Diaz bluestem while researching native plants, you’re not alone in finding limited information about this grass species. Scientifically known as Dichanthium annulatum var. annulatum, this graminoid (grass-like plant) belongs to the extensive grass family, but details about its specific characteristics and garden suitability remain surprisingly scarce.

What We Know About Diaz Bluestem

Diaz bluestem is a grass or grass-like plant that falls into the broader category of graminoids, which includes not just true grasses but also sedges, rushes, and similar plants. Like many grasses in the Dichanthium genus, it’s likely a warm-season grass, but specific details about this particular variety are limited in readily available horticultural literature.

The plant has a few synonyms in botanical circles, including Andropogon annulatus and Andropogon nodosus, which reflects its taxonomic history and relationships with other grass species.

The Information Gap

Here’s where things get tricky for gardeners: comprehensive information about Diaz bluestem’s native range, growing conditions, and garden suitability is not readily available through standard horticultural sources. This lack of information raises some important questions that any responsible gardener should consider:

  • Is this plant native to your region?
  • What are its specific growing requirements?
  • Does it have invasive tendencies?
  • What wildlife benefits does it provide?
  • Is it commercially available from reputable sources?

A Word of Caution for Gardeners

Without clear information about Diaz bluestem’s native status, invasive potential, or specific growing requirements, it’s difficult to recommend this grass for home landscapes. The lack of readily available information could indicate that it’s either very rare, not commonly cultivated, or potentially problematic in certain regions.

What Should Gardeners Do?

If you’re interested in incorporating native grasses into your landscape, consider these alternatives:

  • Contact your local native plant society or extension office to inquire about Diaz bluestem’s status in your area
  • Research well-documented native grass species that provide similar aesthetic or ecological benefits
  • Choose grasses with clear native credentials and established cultivation practices

The Bottom Line

While Diaz bluestem might sound like an intriguing addition to a native plant garden, the lack of comprehensive information makes it a risky choice for most gardeners. When it comes to native landscaping, it’s always better to choose plants with well-documented benefits, clear native status, and established growing guidelines.

If you do encounter this grass in the wild or through specialized native plant sources, take the time to research its specific status in your region before introducing it to your landscape. Your local botanists, extension agents, or native plant experts will be your best resources for determining whether Diaz bluestem is appropriate for your garden goals.

Diaz Bluestem

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Poaceae Barnhart - Grass family

Genus

Dichanthium Willem. - bluestem

Species

Dichanthium annulatum (Forssk.) Stapf - Kleberg's bluestem

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