Prunella vulgaris
broadleaf weedUSDA zones 3–9Active: spring, summerLow-growing perennial in the mint family. Spreads by stolons and seeds to form dense patches, especially in moist, shaded areas.
Square stems; opposite oval leaves; dense club-shaped spike of violet-blue hooded flowers; creeping stolons.
Heal-all colonizes thin, moist turf. Overseed and fertilize to compete.
When: Fall lawn renovation
Pull clumps including stolons. Bag to prevent re-rooting.
When: Pull in spring when soil is moist
Effective systemic control for heal-all. More reliable than 2,4-D on mint family weeds.
When: Apply in fall when plant is storing energy in roots
Active ingredient: Triclopyr — e.g. T-Zone, Turflon Ester
Grass safety: always match herbicides to your grass species — products safe on Kentucky bluegrass can kill St. Augustine or centipede. Lawn Guardian checks this automatically against your lawn profile.
Lawn Guardian turns this guidance into a schedule timed to your USDA zone and this week's actual weather — and adapts every time you log what you've done.
Get your free plan