How to Prune large thyme?
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.

large thyme · Thymus pulegioides
Also known as: broad-leaved thyme; greater wild thyme; downy thyme
Easy to grow in most well-drained, alkaline to neutral soils in full sun
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.