Verbascum can be annuals, biennials, perennials or subshrubs mostly with hairy leaves and 5-petalled, saucer-shaped flowers
Verbascum densiflorum is a BIENNIAL growing to 1.2 m (4ft) by 0.6 m (2ft in).
It is hardy to zone (UK) 5. It is in flower from July to August. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It prefers dry or moist soil.
This plant is useful.
How to get rid of:
Spray the common mullein weeds with a 2 percent solution of glyphosate or triclopyr and water, mixed with a non-ionic surfactant, following the instructions on the label exactly.