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Grow your lunaria plants in a friable, deeply cultivated soil to accommodate their long taproots. Additionally, they prefer a soil mixture that is well-drained and humusy—it should stay evenly moist without becoming waterlogged. soil that stays (or, through irrigation, can be kept) evenly moist.

These unique biennials are grown not for their leaves, but for the flowers that come in the spring of their second year and even more so for what their flowers produce: the seed pods that eventually become the namesake “silver dollars.” The foliage in their first year consists of a basal rosette of leaves, and the flowers that eventually emerge in the spring of year two are typically purple.

The Spruce / Evgeniya Vlasova

Temperature and Humidity

Under the right growing conditions, one plant will eventually multiply into many plants, and it’s their ability to re-seed that makes them such aggressive spreaders. However, if you’re hoping to contain your lunaria collection, controlling the plant is straightforward enough. Harvest the plants after their seed pods are fully developed but before they can drop any seed. This practice kills two birds with one stone since you will want to harvest them anyway in order to use the attractive seed pods.

Lunaria plants need temperatures between 60 degrees and 70 degrees Fahrenheit to germinate and become established in the landscape. After that, as long as they’re planted in the proper USDA hardiness zone, they have no special temperature or humidity requirements.

Keep the soil your lunaria is housed in consistently moist throughout the growing season—about one inch of water (through rainfall or manual watering) a week should do. Keep in mind, the exact amount of water your plant needs can depend on your environment and its location in your landscape. Plants located in constant sunlight may be more thirsty than their shade-dwelling counterparts.

The Spruce / Evgeniya Vlasova

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