// SPECIES PROFILE · ANNUAL · NATIVE

Common threeseed mercury

Acalypha rhomboidea

Common threeseed mercury (Acalypha rhomboidea) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–2'.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 37 U.S. states, including AL, AR, CT, DC, DE, FL…
USDA hardiness: Zones 2b–11b
Mature size: 6"–2'
Sun: Part shade
Water: —
Bloom: —
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Common threeseed mercury (Acalypha rhomboidea) — *Acalypha rhomboidea* — Common threeseed mercury. Photo by User:SB_Johnny via Wikimedia Commons (CC BY-SA 3.0).

Field Notes

[ growing · ecology · siting · care ]

Common threeseed mercury (Acalypha rhomboidea) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–2'.

Why it's on this list: native species profile. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, common threeseed mercury pairs naturally with: Black-Eyed Susan (Rudbeckia hirta), Common Sunflower (Helianthus annuus), Swamp verbena (Verbena hastata), Slenderleaf false foxglove (Agalinis tenuifolia).