Tall Yellow Flower Spikes
Produces upright flowering stems with yellow blooms that add height and color to outdoor planting areas.
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Yellow Woolly Mullein is a flowering plant known for its soft, woolly leaves and tall spikes of yellow flowers. It adds vertical interest to cottage gardens, flower borders, and open landscape plantings. This biennial plant typically develops a leafy rosette during its first year and produces a flowering stalk in its second year. It grows best in full sun and well-drained soil.
Produces upright flowering stems with yellow blooms that add height and color to outdoor planting areas.
Develops fuzzy, felt-like foliage that gives the plant its distinctive appearance.
Typically forms a leafy rosette in the first year before flowering in the second year.
Prefers sunny locations with good drainage and can grow in sandy or relatively poor soils.
| Scientific Name | Verbascum thapsus (if this is the species supplied; verify botanical identity) |
| Common Name | Woolly Mullein, Common Mullein, Great Mullein |
| Plant Family | Scrophulariaceae |
| Seed Type | Flower Seeds |
| Growth Habit | Upright biennial herb |
| Flower Color | Yellow |
| Foliage | Gray-green, soft, woolly leaves |
| USDA Hardiness Zones | Often grown in Zones 3–9; suitability depends on the species and local conditions |
| Planting Season | Spring to early summer, or another locally suitable period |
| Growing Season | Cool to warm growing conditions, depending on climate |
| Sowing Months | Generally spring to early summer; adjust to local climate |
| Germination Time | Often about 2–3 weeks under suitable conditions; may vary |
| Germination Temperature | Approximately 18–24°C (64–75°F) as a general starting range |
| Sunlight Requirements | Full sun |
| Soil Requirements | Well-drained sandy, rocky, or loamy soil |
| Watering | Keep young seedlings lightly moist; established plants prefer well-drained soil |
| Mature Plant Height | Approximately 1–2 metres (3–6.5 feet), depending on conditions |
| Plant Spacing | Allow approximately 45–60 cm (18–24 inches), adjusting for the species and growing conditions |
| Flowering Period | Usually summer, often in the second year |
Yellow Woolly Mullein adds distinctive foliage and tall yellow flower spikes to sunny garden spaces. With adequate sunlight, well-drained soil, and careful seed sowing, it can become an interesting vertical feature in suitable ornamental plantings. Check local guidance before planting, as common mullein can spread readily by seed and is considered invasive or regulated in some areas.
Learn how to germinate Yellow Woolly Mullein Seeds, provide suitable growing conditions, and understand the plant's flowering cycle.
Sow the tiny seeds on the surface of moist, well-drained seed-starting mix and press them gently without covering them deeply. Provide bright light and steady moisture without waterlogging the soil. Germination often takes around 2–3 weeks, although timing varies with seed quality and growing conditions.
If the plant is Verbascum thapsus, it usually forms a low rosette of woolly leaves during its first year and produces a tall flowering stalk in its second year. Flowering time depends on planting date, climate, and growing conditions.
Common mullein can grow in relatively poor, sandy, or rocky soil as long as drainage is good. Full sun supports healthy growth, while persistently wet soil can cause problems. Check local invasive-plant guidance before growing it, because common mullein can spread by seed and is regulated in some regions.