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Growing Verbascum

Growing Verbascum

Clementine Verbascum

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Hardy perennials with rosettes of large leaves and tall flower spikes in summer. Individual flowers have prominent "fuzzy" stamens. Hardy in zones 5 to 8. Good for specimen or background plants and to provide vertical accents in the garden. Can also be grown in mixed containers or used as cut flowers. Plant outdoors after frost danger has passed in spring. Bare root plants can be soaked in water for a few hours to hydrate them before planting. Set so that the top of the crown is ¼ to ½ inch above ground.

Maintenance

Plant in full sun in soils that are well-drained, especially in winter. Verbascum is tolerant of drought and low-fertility soils. It is usually short-lived and may need replanting every few years. Plants can be divided in spring every two to three years to maintain vigor and may rebloom in fall if deadheaded.

Fertilizer Recommendations

Use low rates of Algoflash Flowering Plant 4-6-7 Liquid Fertilizer (51087), Neptune Fish & Seaweed Fertilizer 2-3-1 (51221), or Osmocote 14-14-14 (51173).

Alternative Products

Other perennials with large flower spikes include Delphinium, Digitalis, and Liatris. 

Complimentary Products

Verbascum is a light feeder and benefits from occasional fertilization. Combines well with foliage perennials like Silver Mound Artemisia (10424). Other good perennials for cut flowers include Coneflower and Rudbeckia.

Verbascum Facts

Usually free from pests and diseases. Mites are occasionally a problem, especially in hot climates. Rot can occur if plants are grown in wet or poorly-drained soils. Deer and rabbits generally do not eat Verbascum. New breeding has expanded the color range of Verbascum flowers. 

Growing Tips