Primrose Seeds - Showy Evening (Yellow) Winter hardy to zone 4,Perennial Flowers

Oenothera macrocarpa (syn. O. missouriensis) — Missouri Evening Primrose — is widely considered one of the most beautiful of all the evening primroses. Clear, paper-thin yellow blossoms up to 5 inches across open in the late afternoon and remain open through the evening, releasing a rich fragrance that draws bees, butterflies, and moths. The sprawling, 12-inch habit with soft, velvety foliage makes it equally at home at the front of a border, spilling over a wall, or naturalized in a dry meadow. Winter hardy to Zone 4 and a liberal self-sower once established.

Plant Highlights

• Enormous, paper-thin clear yellow blooms — up to 5 inches across
• Flowers open late afternoon and remain open through the evening
• Rich fragrance; attracts bees, butterflies, and moths
• Sprawling, 12-inch habit; excellent at border fronts and in rock gardens
• Winter hardy to Zone 4; self-sows liberally
• Bloom season: June through September
• Approx. 3,200,000 seeds per pound

Growing Guide

Direct sowing: Prepare weed-free soil and loosen the top 1–2 inches. Spread seeds and rake in lightly — do not bury deeply. Sow in early spring or late fall. Seeds need light to germinate; press into the soil surface without covering.

Site & soil: Full sun to partial shade; well-drained soil (pH 5.8–6.8). Tolerates dry conditions once established — the deep taproot makes it drought-resilient.

Ongoing care: Apply compost around plants in spring before flowering as a light fertilizer. Cut back after blooming to reduce spreading if self-sowing is not desired.

Companion Plants

Grows beautifully alongside Gaillardia, 'Blue Queen' Salvia, 'Fuji Blue' Balloon Flower, Blue Fescue, and 'Telham Beauty' Campanula.

Planting Specs

• Type: Perennial
• USDA Zones: 4–10
• Height: 12–16 inches (sprawling habit)
• Bloom season: June–September
• Bloom color: Clear yellow
• Light: Full sun to partial shade
• Soil: Well-drained, pH 5.8–6.8
• Deer resistant: Yes
• Germ temp: 65–70°F | Avg. germ time: 20–45 days
• Spacing: 12–18 inches