Madagascar Periwinkle

full sun (6 or more hours of sun hitting the leaves per day. South-facing window, no obstructions. Under grow lights, keep them 4-8 inches away for 12-14 hours) is preferred - at least 6 hours of direct sunlight daily. It is a warm-weather plant and performs best in strong light. Partial shade is tolerated but reduces flowering.

Tolerates average to low humidity well. Avoid overhead watering, which promotes fungal disease. Good air circulation around the plant helps prevent leaf spot and blight.

well-draining soil (equal parts potting soil, perlite, and orchid bark. The goal is soil that lets water flow through without staying soggy) is essential. A mix with coco coir and perlite or vermiculite works well for containers. Tolerates a range of pH but prefers slightly acidic to neutral.

Aphids can appear on undersides of leaves; blast them off with water or use insecticidal soap. Fusarium wilt, stem rot, leaf spot, and aster yellows are the main disease risks - all are minimized by good drainage and avoiding overhead irrigation. Spider mites occasionally appear in dry conditions.