When to plant Mullein 'Southern Charm'?
Best month and method — Verbascum 'Southern Charm'
Plant your mullein 'Southern Charm' in March, April, May, September and October — the optimal month is usually May.
You're in the planting season right now — a good moment to start.

Spacing
40 cm
≈ 6 plants
For an X m² border, calculate: X × 6 plants.
Step by step: plant mullein 'Southern Charm'
Verbascum 'Southern Charm' thrives in full sun and well-drained soil, making it ideal for sunny borders, gravel gardens, and Mediterranean-style plantings. It tolerates sandy, loamy, and chalky soils but will not perform well in heavy clay or waterlogged ground. If your soil is prone to sitting wet, dig in plenty of grit or horticultural sand before planting to improve drainage. Plant 'Southern Charm' in March, April, or May for establishment before summer, or in September and October so roots can settle over autumn and winter. Space plants 40 cm apart to allow for their mature spread of 30–45 cm and to ensure good air circulation, which helps prevent fungal issues. Dig a hole slightly larger than the root ball and set the plant at the same depth it was growing in its pot. Backfill with soil, firm gently with your hands, and water in well to settle the roots. Although verbascums have low water needs once established, initial watering is important during the first few weeks to help the plant get going. After planting, apply a thin layer of gravel or grit mulch around the base. This keeps the crown dry and mimics the free-draining conditions verbascums prefer in their native habitats. Avoid organic mulches like compost or bark, which can retain too much moisture around the neck of the plant and encourage rot. Staking is rarely needed unless your garden is very exposed; the sturdy stems of 'Southern Charm' typically reach 60–120 cm and support themselves well in most situations.