How to prune sneezewort

Shear after first bloom (early–midsummer); cut back fully in late autumn. After the first bloom flush, cut the whole plant back by half with shears to encourage rebloom and limit spreading. In late autumn, cut all growth to ground level. Divide clumps every 2 years in spring — sneezewort spreads by rhizomes and can become invasive.

Shear once mid-season; full cut-back annually; divide every 2 years. Sneezewort (Achillea ptarmica) is a spreading, white-flowered yarrow relative. Shear plants back by half after the first bloom flush in early to midsummer to stimulate a second wave of flowers and curb its tendency to spread. Cut to the ground in late autumn. Divide every 2 years to keep it contained.

After the first bloom flush, cut the whole plant back by half with shears to encourage rebloom and limit spreading. In late autumn, cut all growth to ground level. Divide clumps every 2 years in spring — sneezewort spreads by rhizomes and can become invasive.