// SPECIES PROFILE · PERENNIAL · NATIVE

Hartweg's sundrops

Calylophus hartwegii

Hartweg's sundrops (Calylophus hartwegii) is a perennial in the — family. Native range includes KS, OK. Hardy in zones 2b–10b. Blooms Mar–Nov.

// QUICK FACTS

Family: —
Group: perennial
Native range: Native to AZ, CO, KS, NM, OK, TX
USDA hardiness: Zones 2b–10b
Mature size: —
Sun: Part shade
Water: Low · xeric
Bloom: Mar–Nov
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Hartweg's sundrops (Calylophus hartwegii) — *Calylophus hartwegii* — Hartweg's sundrops. Photo by Megan Hansen https://www.flickr.com/photos/nestmaker/ via Wikimedia Commons (CC BY-SA 2.0).

Field Notes

[ growing · ecology · siting · care ]

Hartweg's sundrops (Calylophus hartwegii) is a perennial in the — family. Native range includes KS, OK. Hardy in zones 2b–10b. Blooms Mar–Nov. Low water use makes it a strong candidate for xeric and drought-conscious plantings.

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, hartweg's sundrops pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Butterfly Milkweed (Asclepias tuberosa), Cardinal Flower (Lobelia cardinalis), Cobaea Beardtongue (Penstemon cobaea).