Dandelions in Periwinkle: Weed-and-Feed Risks Killing Groundcover

Reader Question: Can I Use Weed-and-Feed on Periwinkle to Kill Dandelions?

"Large periwinkle area invaded by dandelions. Can I use weed-and-feed like on grass? Brand recommendation?"

Expert Answer: High Risk—2,4-D Damages Periwinkle Too

Weed-and-feed contains 2,4-D (broadleaf herbicide). Periwinkle (Vinca minor) is a broadleaf plant—it will be injured or killed.

Safer Options

• Hand-weed in spring and fall – most effective, zero collateral damage.
• Spot-treat dandelions with glyphosate (Roundup) using a shielded sprayer or paintbrush on leaves. Avoid periwinkle contact.
• If using 2,4-D: Apply in fall when periwinkle leaves are waxy/mature (less absorption) and dandelions are actively translocating to roots. Still risky.

For a large area, persistent hand-weeding twice a year gives the best long-term control without sacrificing the groundcover.