Euphorbia margalidiana · Perennial
Root and stem rots: Ensure excellent drainage by planting in gritty compost and avoid overwatering, especially in winter.
Aphids: Squash infestations by hand or use a strong jet of water to dislodge them; introduce ladybirds if severe.
Powdery mildew: Improve air circulation around the plant and avoid wetting foliage when watering.
Slugs and snails: Use physical barriers like copper tape or apply iron phosphate-based pellets around the base.
Vine weevil: Apply systemic insecticide drenches in spring and autumn or use nematodes for biological control.