Calylophus hartweggi, (“Hartweg's Sundrops")
Calylophus hartwegii, (“Hartweg’s Sundrops”)
Drought Tolerant, Hot & Dry areas, Full Sun to part shade, Low Water, clay, sandy, caliche and other poor soils. Actually enjoys reflected heat.
Sundrops is a tough Perennial flowering plant that thrives on heat, low water, rocky soils, other poor soils, but does like good drainage. Bright lemon yellow blooms look almost square when fully open; usually opening in the afternoon and staying open through the night until next morning (Night-flying hawk moths get nectar from these night blooming lovelies). Typically blooms in late spring (March) and summer through fall (November), and grows about 10-12 inches high and up to 2 feet wide, in a sprawling fashion. Flowers last 24 hours, and then fade to an orange or peach color which gives some nice contrast. Can be a nice groundcover. Good choice for a rock garden or rocky slope. Deadhead and give it some summer water to prolong blooming period.
Grows to about 10” tall & 2’ wide & makes a nice groundcover when planted in mass. Part of the Evening Primrose family, it spreads with rhizomes, but spreads much more slowly than other evening primrose types and does not become invasive. Native to Texas, Oklahoma, Kansas, Colorado, New Mexico & Arizona, it was used by Navajo to treat internal bleeding. Hardy to 20°F. Prune down about 1/3 of its size (to 6-8 inches) in fall to reshape.
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