What's Eating Your Common Foxglove?

Strong water blast every 2 to 3 days for 2 weeks

Hold a hose nozzle 12 inches from the flower spike and spray at high pressure, top and bottom of the spike and along the upper rosette leaves. Most aphids dislodge and don't make it back to the plant. Repeat every 2 to 3 days for 2 weeks. The fastest, cheapest fix and works without chemicals near pollinators.

Insecticidal soap on the spike at dusk, weekly

Spray ready-to-use insecticidal soap (Safer Insect Killing Soap, ~$10) directly on aphid clusters at dusk when bees aren't active. Soak the underside of leaves and along the spike. Repeat weekly for 3 weeks. Works on contact only, so coverage matters more than concentration.

Plant alyssum and yarrow nearby for ladybugs

Plant sweet alyssum, dill, or yarrow within 3 feet of the foxglove patch. These attract ladybugs and lacewings, which feed on aphids. Established plantings keep aphid pressure low without sprays and last for years. Especially valuable on foxglove because broad-spectrum sprays threaten the bumblebees that pollinate the bells.

Sluggo iron phosphate bait around the rosette

Scatter Sluggo or Garden Safe Slug & Snail Bait (~$12, iron phosphate based) on the soil around the basal rosette in the evening. Reapply after heavy rain and weekly through spring. Iron phosphate breaks down into fertilizer and is safe around pets, pollinators, and the wildlife that brush past foxglove.

Hand-pick at night with a headlamp

Pull mulch back 6 inches from the crown

Foxglove crowns rot under heavy wet mulch and the gap between mulch and crown removes a slug daytime hideout. Keep a 6-inch bare ring of soil around the rosette, especially through wet spring weather. Helps the crown breathe and starves slugs of cover.

Water deeply and shower the foliage

Foxglove wants consistently moist soil, not wet, and partial shade in hot afternoons. Soak the bed deeply and rinse the underside of every rosette leaf with cool water from a hose. Mites can't reattach quickly when knocked off, and rinsed humidity slows survivors. Repeat weekly for 3 weeks.

Move the plant to part shade if container-grown

If you grow foxglove in pots, shift the container to a spot with morning sun and afternoon shade. Spider mites breed fast in hot dry conditions and stall in cooler humidity. Foxglove naturally prefers woodland-edge conditions, so the move helps the plant in general.