How much sun does Fiber-optic-grass need?

Fiber-optic-grass grows best in full sun conditions.

When does Fiber-optic-grass bloom?

Fiber-optic-grass blooms in May, June, and July.

Where is Fiber-optic-grass native?

Fiber-optic-grass (Isolepis cernua) is native to CA, IL, OR, TX and 1 more states, per the World Checklist of Vascular Plants (Kew).

Fiber-optic-grass

Name: Pollinator Patch
Author: Pollinator Patch

Isolepis cernua

Last reviewed: September 2026

Fiber-optic-grass (Isolepis cernua) is a perennial grass native to CA, IL, OR, TX and 1 more states. It blooms in May, June, and July.

Toxicity unknown

Fiber-optic-grass (Isolepis cernua) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

full sun

Water

high

Size

6"–12" H × 8"–12" W

Bloom

May, Jun, Jul

Native to

CA, IL, OR, TX and 1 more states

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 458 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Coast Range Puget Lowland Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains Southern California/Northern Baja Coast

Fine, thread-like evergreen rush forming a soft, fountain-shaped clump tipped with tiny round spikelets. Found in wet seeps, marsh edges, and shallow pool margins.

Growing Fiber-optic-grass

Grow Fiber-optic-grass in full sun and high water. Mature plants reach 6 to 12 inches tall and spread 8 to 12 inches wide.

Wildlife value

Dense fine foliage provides cover for small wetland insects and amphibians.

Common questions

How much sun does Fiber-optic-grass need?: Fiber-optic-grass grows best in full sun conditions.
When does Fiber-optic-grass bloom?: Fiber-optic-grass blooms in May, June, and July.
Where is Fiber-optic-grass native?: Fiber-optic-grass (Isolepis cernua) is native to CA, IL, OR, TX and 1 more states, per the World Checklist of Vascular Plants (Kew).

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

See all plant problem guides

Ready to grow Fiber-optic-grass? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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