Verbascum densiflorum × phlomoides, commonly known as Denseflower Mullein or Woolly Mullein, is a hybrid perennial herb. It is native to Europe and Asia, typically found in meadows, on slopes, and in disturbed areas. This plant grows at a moderate rate to a height of 3-8 feet (0.9-2.4 meters) and a width of 1-2 feet (0.3-0.6 meters). It has a rosette of large, woolly leaves at the base and a tall, erect stem with dense clusters of yellow, showy flowers that bloom in the summer. The flowers are particularly attractive to bees and other pollinators.

Denseflower Mullein is valued for its striking vertical form and the textural contrast its woolly leaves provide in the garden. It is often used in cottage gardens, naturalized plantings, and as an accent plant in borders. It thrives in full sun and adapts well to a variety of soil types, including clay, loam, and sandy soils, provided they have medium to fast drainage. It is drought-tolerant once established, requiring low amounts of water. While generally low-maintenance, it can self-seed prolifically and may become weedy. Gardeners should be aware of its potential to spread and may need to manage self-seeding to prevent unwanted growth.CC BY-SA 4.0