There is a baffling array of Verbascum offered for sale, particularly as recent years have seen an expansion of horticultural interest introducing many new cultivars. Some of the newer varieties are less short-lived and with a greater range of colours. Given the extensive range, picking those with known good qualities and/or the RHS Award of Garden Merit is always a good starting point.
Recommended is Verbascum chaixii var. album this is one of the most commonly grown varieties. Pure white flowers with pink eyes, it grows to around 90cms and has the RHS award. I illustrate it left growing with the pom pom flowers of Echinops, another drought tolerant sun loving perennial.
Another popular variety illustrated centre top is Verbascum nigrum, a vigorous perennial variety, widely grown and reaching up to 1.2m
The native wild Verbascum Thapsus has multiple yellow flowers. This is a very tall biennial variety reaching a height in its second year of up to 2.5m, so not suitable for all gardens.
Often offered for sale are varieties in the Verbascum "Cotswold Group", a perennial variety growing to around 1m in a variety of colours besides the more common white and yellow, there are also buff, apricot, pinks and peachy shades.