Growing Mullein 'Southern Charm' in a pot

Once established, Verbascum 'Southern Charm' is a low-maintenance perennial with minimal water and feeding needs. Water newly planted specimens regularly for the first six to eight weeks, then reduce frequency. Established plants are drought-tolerant and rarely need watering except during prolonged dry spells in summer. Overwatering or poorly drained soil is far more harmful than occasional dryness, often leading to crown rot. Feed lightly in April or May with a general-purpose granular fertiliser or a handful of blood, fish, and bone scattered around the base of the plant. Verbascums prefer lean conditions and too much nitrogen encourages soft, floppy growth prone to flopping and disease. A single spring feed is sufficient; avoid feeding later in the season. 'Southern Charm' is hardy in zones 5–9 and requires no special winter protection in temperate Europe. The basal rosette remains visible through winter, so avoid smothering it with mulch or fallen leaves, which can cause rot. A gravel mulch applied at planting time usually lasts several years and helps keep the crown dry. Pests are rarely a problem, but verbascum moth caterpillars can occasionally appear in late spring or summer, chewing holes in leaves and flower spikes. Check plants regularly and pick off caterpillars by hand if you spot them. Powdery mildew may develop on foliage in humid conditions or overcrowded plantings; ensure good spacing and avoid overhead watering. Rust can also occur; remove and bin affected leaves promptly. Overall, 'Southern Charm' is a robust, undemanding plant that rewards neglect better than fussing.