Valerian, also known as garden heliotrope, is a fragrant perennial herb that grows in clumps. Valerian produces pale pink flowers that are heavily fragrant, smelling somewhat similar to a mixture of cloves and vanilla. Valerian grows up to 5 feet tall and 1 foot wide, and the flowers bloom from June through September. The stringy roots of this European and Northern Asia native herb are harvested for their medicinal properties, often used as a sedative or sleep aide.
Prepare a planting site in full sunlight for the valerian plants by working some aged manure or organic compost into the soil down about 12 inches deep. Dig planting holes for your valerian that are the same size and width as the nursery containers or root balls.
Space the valerian plants about 1 foot apart in rows that are 2 to 3 feet apart. Gently firm the soil around the roots, and water the soil thoroughly and deeply after planting.
Water your valerian lightly two to three times each week to supplement rainfall. Water the herbs more deeply during times of drought or dry spells.
Feed your valerian a high-nitrogen liquid fertilizer once each month during the growing season. Apply the fertilizer when you water the valerian and according to the dosage instructions on the label.
Snip off the flowers after they fade. You can dig up and divide the valerian clumps in the spring or fall to replant them elsewhere.