Dig up the entire daylily clump now (or in spring), carefully remove the crabgrass, and replant the daylily. Mulch to protect from freezing if done in winter. This eliminates the grass without herbicides that could harm the daylily.
Crabgrass vs. Cool-Season Grass: Fall Overseeding Strategy
Beating Crabgrass on Long Island: An Organic Fall Strategy
Crabgrass Prevention in Heavy Clay: Fix the Soil First
Daylily 'Coral Crab': A 1954 Douglas Hybrid
Rejuvenating a Hollow-Center Pampas Grass Clump
Replanting a Daylily with a Small Root Ball
Is Lemongrass Perennial in Indianapolis? Overwintering Tips for Zone 5/6
Lawn Destroyed by Drought and Crabgrass: Recovery Plan
Why It's Too Late for Crabgrass Preventer After Overseeding: Organic Alternatives
Organic Crabgrass Control and Lawn Care with Limited Water
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