Dark green, fast-growing patches in a Red Deer, Alberta lawn—no dogs present. Previous owner was allergic. Over-fertilization suspected but homeowner wants to fix patches, not fertilize the other 95%.
Localized over-fertilization (perhaps from prior owner's spot treatments, pet waste, or decomposed organic matter) creates exactly this symptom: darker, faster-growing grass in patches. Since it's the same grass species, the patches aren't a different grass type.
Fertilizing 95% to match 5% creates dependency, increases mowing, invites disease, and wastes resources. The patches aren't "sick"—they're over-stimulated. Let them self-correct.
Send close-up and wide-angle photos to TheLawnCoach@aol.com for precise diagnosis. In Alberta's cool-season zone, Kentucky bluegrass/fescue mixes dominate. Focus on overall lawn health: mow high (3"), water deeply, soil test annually, organic amendments only.
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