Plant Library

Other Names:  Brompton Stock

Group/Class:  Harmony Series

Description:

A uniform, dwarf variety producing low spikes of highly fragrant, purple double flowers in late spring; plants tend to decline under high mid-summer temperatures; a popular cut flower

Ornamental Features

Harmony Purple Stock features showy spikes of fragrant purple flowers rising above the foliage from late spring to early fall. The flowers are excellent for cutting. Its tomentose oval leaves remain grayish green in color throughout the season.

Landscape Attributes

Harmony Purple Stock is an herbaceous biennial with an upright spreading habit of growth. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This is a relatively low maintenance plant, and is best cleaned up in early spring before it resumes active growth for the season. It is a good choice for attracting bees and butterflies to your yard, but is not particularly attractive to deer who tend to leave it alone in favor of tastier treats. It has no significant negative characteristics.

Harmony Purple Stock is recommended for the following landscape applications;

• Accent
• Mass Planting
• Border Edging
• General Garden Use
• Container Planting

Planting & Growing

Harmony Purple Stock will grow to be about 8 inches tall at maturity extending to 12 inches tall with the flowers, with a spread of 10 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 8 inches apart. It grows at a fast rate, and tends to be biennial, meaning that it puts on vegetative growth the first year, flowers the second, and then dies.

This plant does best in full sun to partial shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It may require supplemental watering during periods of drought or extended heat. It is not particular as to soil type or pH, and is able to handle environmental salt. It is somewhat tolerant of urban pollution. This is a selected variety of a species not originally from North America.

Harmony Purple Stock is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers against which the larger thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.