When does tuberous grasspink bloom?

Calopogon tuberosus typically flowers from June through August, with a single spike of magenta pink blooms opening over several weeks.

What pollinates Calopogon tuberosus?

Bees and butterflies visit the flowers. The blooms lack nectar and instead use a hinged lip to trap bees briefly against the pollen, a mimicry strategy common among grasspink orchids.

What growing conditions does tuberous grasspink need?

This orchid grows best in full sun to light part shade in consistently moist to wet, acidic soils such as those found in bogs, fens, and wet meadows.

Is Calopogon tuberosus easy to grow in a home garden?

It is difficult outside specialized bog gardens because it needs sustained soil moisture, acidic conditions, and often a symbiotic soil fungus to thrive.

Is Tuberous Grasspink HOA-friendly?

Tuberous Grasspink takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Tuberous Grasspink

Name: Pollinator Patch
Author: Pollinator Patch

Calopogon tuberosus

Last reviewed: September 2026

Calopogon tuberosus, the tuberous grasspink, is a wetland orchid that blooms magenta pink flowers from June through August in bogs, fens, and wet pine savannas across the eastern and midwestern United States.

Toxicity unknown

Tuberous Grasspink (Calopogon tuberosus) 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

medium

Size

4"–16" H × 2"–6" W

Bloom

Jun, Jul, Aug

Native to

AL, AR, CT, DE and 29 more states

Pollinators

bees, butterflies

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Tuberous grasspink is a delicate native orchid that produces striking pink flowers with a distinctive upside-down bloom arrangement. This small, slender plant emerges from underground tubers and thrives in sunny, moist conditions. The grass-like foliage remains inconspicuous until the showy flower spike appears in summer.

Growing Tuberous Grasspink

Grow Tuberous Grasspink in full sun and medium water. Mature plants reach 4 to 16 inches tall and spread 2 to 6 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Tuberous Grasspink takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Completely disappears when dormant
May be mistaken for weeds due to grass-like appearance
Extremely small and sparse appearance

Wildlife value

The unusual flowers attract native bees and butterflies during the summer blooming period. As a native orchid, it supports specialized pollinators that have co-evolved with this unique plant family.

Common questions

When does tuberous grasspink bloom?: Calopogon tuberosus typically flowers from June through August, with a single spike of magenta pink blooms opening over several weeks.
What pollinates Calopogon tuberosus?: Bees and butterflies visit the flowers. The blooms lack nectar and instead use a hinged lip to trap bees briefly against the pollen, a mimicry strategy common among grasspink orchids.
What growing conditions does tuberous grasspink need?: This orchid grows best in full sun to light part shade in consistently moist to wet, acidic soils such as those found in bogs, fens, and wet meadows.
Is Calopogon tuberosus easy to grow in a home garden?: It is difficult outside specialized bog gardens because it needs sustained soil moisture, acidic conditions, and often a symbiotic soil fungus to thrive.
Is Tuberous Grasspink HOA-friendly?: Tuberous Grasspink takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

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

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