Veronica officinalis
broadleaf weedUSDA zones 3–8Active: springLow-growing perennial that creeps through turf in spring, producing tiny blue flowers. Several species exist; all thrive in thin, moist lawns.
Small, scalloped oval leaves; tiny 4-petaled blue flowers with dark stripes; creeping, mat-forming growth; hairy stems.
Speedwell colonizes thin, moist turf. Overseed and fertilize.
When: Fall overseeding
Pull mats in spring. Shallow roots make removal easy.
When: Pull in early spring before flowering
More effective than 2,4-D on speedwell species.
When: Apply in spring when actively growing
Active ingredient: Triclopyr — e.g. T-Zone, Ortho Weed B Gon Chickweed Killer
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.
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