North America Non-native Plant

Tropical Bent

Botanical name: Bromidium

USDA symbol: BROMI

Life cycle: annual

Habit: grass

Native status: Non-native, reproduces and persists in the wild in the lower 48 states  

Tropical Bent: A Lesser-Known Grass Worth Understanding If you’ve stumbled across the name tropical bent in your gardening research, you’ve discovered one of the more obscure grasses in the botanical world. Known scientifically as Bromidium, this annual grass might not be on every gardener’s wish list, but it’s worth understanding ...

Tropical Bent: A Lesser-Known Grass Worth Understanding

If you’ve stumbled across the name tropical bent in your gardening research, you’ve discovered one of the more obscure grasses in the botanical world. Known scientifically as Bromidium, this annual grass might not be on every gardener’s wish list, but it’s worth understanding what it brings to the table—and what it doesn’t.

What Is Tropical Bent?

Tropical bent (Bromidium) is an annual grass that falls into the category of non-native plants. While it’s not originally from North America, it has established itself here and can reproduce on its own without human intervention. Think of it as that friend who moves to a new city and somehow manages to thrive without much help—it’s adaptable, but it’s not exactly a local.

Where You’ll Find It

In the United States, tropical bent has made its home primarily in California. It’s not exactly spreading across the continent like some other introduced grasses, which keeps it relatively contained to the Golden State.

Should You Plant Tropical Bent?

Here’s where things get a bit tricky. While tropical bent isn’t listed as invasive or particularly problematic, there’s also not a wealth of information about why you’d want to grow it in the first place. It’s one of those plants that exists in a sort of horticultural limbo—not harmful enough to avoid completely, but not remarkable enough to actively seek out.

Since detailed growing information is limited, and considering that it’s not native to our ecosystems, you might want to consider some alternatives that offer more benefits to local wildlife and are better documented for home gardeners.

Native Grass Alternatives to Consider

Instead of tropical bent, consider these native California grasses that will better support local ecosystems:

  • California fescue (Festuca californica) – A beautiful bunch grass perfect for naturalized areas
  • Purple needlegrass (Stipa pulchra) – California’s state grass with stunning purple seed heads
  • Blue wildrye (Elymus glaucus) – Excellent for wildlife habitat and erosion control
  • Deer grass (Muhlenbergia rigens) – Drought-tolerant with attractive fountain-like form

The Bottom Line

Tropical bent represents one of those botanical mysteries that reminds us how much we still don’t know about the plant world. While it’s not going to harm your garden if it shows up, it’s also not going to be the star of your landscape design.

If you’re looking to create a thriving, ecologically beneficial garden, your energy is better spent on well-documented native plants that support local wildlife and have proven track records in home landscapes. Save the experimentation for plants with clearer benefits and growing guidelines—your garden (and the local ecosystem) will thank you for it.

Tropical Bent

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

Bromidium Nees & Meyen - tropical bent

Species

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