What's eating my false shamrock?

False shamrock (Oxalis triangularis) is most commonly attacked by spider mites indoors, particularly if humidity is low. Outdoors, aphids cluster on the tender stems, and vine weevil grubs can damage the underground rhizomes. Fungus gnats may also be a problem in overly wet soil. Keep soil appropriately dry between waterings and inspect stems regularly.

Tiny yellow or bronze specks on the triangular leaf surfaces; fine webbing on stems; leaves may curl and look dull. Wipe leaves with a damp cloth; apply insecticidal soap or neem oil spray; raise humidity; repeat weekly for 3–4 weeks.

Small soft insects on stems and under leaves; curled or distorted growth; sticky honeydew; common outdoors in spring. Blast off with water; apply insecticidal soap spray; introduce beneficial insects such as lacewings for outdoor plants.

Notched, scalloped edges on leaves from adult feeding; sudden wilting and collapse caused by C-shaped white grubs eating rhizomes. Apply nematodes (Steinernema kraussei) to moist soil in late summer/fall; repot to remove grubs; use vine weevil barrier tape outdoors.

Root damage by larvae causing wilting despite apparent care; adults flying around soil surface. Allow the top 1–2 inches of soil to dry before watering; apply BTi (Bacillus thuringiensis israelensis) drench; use yellow sticky traps.