Verbascum Growing Guide

Verbascum phoeniceum and Verbascum chaixii hybrids, Verbascum thapsis (common mullein)

Crop Rotation Group

Miscellaneous ●

Soil

Fertile, well-drained soil with a slightly alkaline pH.

Position

Full sun.

Frost tolerant

Yes, verbascums are hardy biennials or perennials. Plants are hardy to about -26°C (-15°F).

Feeding

Mulch over the plants’ root zones with rich compost just as new growth emerges in spring. Drench plants with a liquid fertiliser when they begin to grow tall.

Spacing

Single Plants: 30cm (11") each way (minimum)
Rows: 30cm (11") with 30cm (11") row gap (minimum)

Sow and Plant

Verbascum can be started from seeds .Sow seeds directly or in seed trays in early autumn. When large enough to handle, transplant out. Young plants need water when they are actively growing, but become very drought resistant after they develop deep taproots.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.

Notes

Limited varietes are available in South Africa, usually from specialist seed companies. A hairy biennial it grows to 2 m tall or more and has a deep tap root.

Harvesting

Gather stems for use in cut arrangements as you need them, when at least half of the flowers on a stem are open. Cutting old blossoms will stimulate modest reblooming. Allow a few spikes to stay on the plants until they shed mature seeds. When happy with their site, verbascum are often successful reseeders.

Planting and Harvesting Calendar

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Pests which Affect Verbascum

Aphids (General)

Slug

Snail