Honesty
Also known as
Annual honesty, Money plant, Silver dollar plant, Lunaria, Moonwort
Keep this plant’s care guide close at hand.
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Lunaria annua is a short-lived biennial in the mustard family (Brassicaceae), prized for its papery, silvery seedpods used in dried arrangements. In its first year it forms a coarse, heart-shaped leaf rosette; in the second spring it sends up branching stems 60–90 cm tall bearing loose clusters of four-petaled flowers in shades of purple, lilac, or white. The blooms are lightly fragrant and attract bees and early butterflies. After flowering, flat, round seedpods (silicles) develop; when the outer layers weather away, a translucent central membrane remains, resembling coins. Native to the Balkans and parts of southwestern Asia, it has naturalized widely across Europe and North America, especially along woodland edges and hedgerows. It thrives in moist, well-drained, moderately fertile soils and partial shade, tolerating sun in cool climates. The plant self-sows readily, often persisting in cottage gardens with minimal care.
Taxonomy
Properties & Requirements
How to care for Honesty
Water
Keep soil evenly moist, especially during rosette establishment and flowering. Water when the top 2–3 cm of soil feels dry, delivering a deep soak rather than frequent light sprinkles. Aim for about 2.5 cm (1 inch) of water per week from rain and irrigation combined; increase slightly in sandy soils or prolonged heat. Use mulch to reduce evaporation. Avoid waterlogging—good drainage is essential to prevent root issues and to ensure sturdy stems and quality seedpods.
Light
Partial shade to dappled light is ideal, especially in regions with warm summers. In cool-summer climates, full sun produces the most flowers and well-formed pods if soil moisture is maintained. In hotter areas, protect from strong afternoon sun to prevent wilting and premature senescence. Too much deep shade results in lanky growth and fewer blooms. Provide 3–6 hours of direct morning sun or bright, filtered light throughout the day for balanced development.
Nutrients
Honesty is not a heavy feeder. Work in compost or well-rotted manure before sowing or at rosette stage, then top-dress lightly each spring. If growth seems pale, apply a balanced, slow‑release fertilizer at low rates, or a half-strength liquid feed just as buds form. Avoid high-nitrogen formulas, which promote leafy growth at the expense of flowers and decorative pods. Maintain soil fertility by mulching with leaf mold to conserve moisture and steady nutrient release.
Temperature
Best in cool to mild climates; hardy outdoors roughly in USDA Zones 4–9. Plants benefit from winter chill (vernalization) to trigger abundant spring bloom. Optimal growing temperatures are 10–21°C (50–70°F). Brief heat is tolerated, but sustained temperatures above 29°C (85°F) can reduce flowering and pod quality; provide shade and consistent moisture in hot spells. Rosettes are frost-tolerant; severe freeze on poorly drained soils can heave plants, so maintain mulch and drainage.
