Achillea millefolium
broadleaf weedUSDA zones 3–9Active: spring, summer, fallTough perennial with feathery, fern-like foliage. Drought-tolerant and spreads by rhizomes. Some consider it an acceptable lawn component.
Finely divided, fern-like leaves with soft, feathery texture; flat-topped clusters of white flowers; aromatic when crushed.
Yarrow is drought-tolerant and can be left as part of a low-maintenance lawn. Fertilizing favors turf.
When: Assess preference; fertilize if removal desired
Dig out clumps including rhizomes. Can be persistent.
When: Dig in spring when soil is moist
Effective systemic control for established yarrow patches.
When: Apply in fall when actively growing
Active ingredient: Triclopyr — e.g. Turflon Ester, T-Zone
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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