How to Prune thyme 'Highdown'?
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.

thyme 'Highdown' · Thymus 'Highdown'
Easy to grow in most well-drained alkaline to neutral soils in full sun. Dislikes winter wet
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.