Carnations thrive in bright, indirect light when grown indoors. Place them near a south or west-facing window where they can receive at least 4-6 hours of sunlight daily. Avoid direct midday sun, as it can scorch the leaves. Maintain a consistent temperature between 60-70°F (15-21°C), as carnations prefer cooler conditions. Ensure good air circulation but keep them away from drafts, heaters, or air conditioners, which can cause stress.
Carnations prefer evenly moist soil but are susceptible to root rot if overwatered. Water the plant when the top inch of soil feels dry to the touch. Use room-temperature water and water deeply until excess drains from the bottom of the pot. Avoid wetting the foliage, as this can lead to fungal diseases. Reduce watering frequency in winter when growth slows.
Plant carnations in well-draining, slightly alkaline soil with a pH of 6.5-7.5. A mix of potting soil, perlite, and compost works well. Fertilize every 2-4 weeks during the growing season (spring and summer) with a balanced, water-soluble fertilizer diluted to half strength. Avoid over-fertilizing, as this can cause leggy growth and fewer blooms.
Carnations prefer moderate humidity levels (40-50%). If indoor air is too dry, place a humidity tray filled with water and pebbles beneath the pot or use a room humidifier. Ensure proper air circulation to prevent fungal issues, but avoid placing the plant in windy spots.
Regular pruning encourages bushier growth and more blooms. Pinch back the tips of young plants to promote branching. Remove spent flowers (deadheading) to redirect energy into new blooms. Trim yellow or damaged leaves to maintain plant health. Use clean, sharp scissors to avoid spreading diseases.
Common pests include aphids, spider mites, and thrips. Inspect plants regularly and treat infestations with insecticidal soap or neem oil. Prevent fungal diseases like powdery mildew by avoiding overhead watering and ensuring good air circulation. If signs of disease appear, remove affected parts and treat with a fungicide if necessary.
Repot carnations every 1-2 years or when roots outgrow the container. Choose a pot 1-2 inches larger in diameter with drainage holes. Gently loosen the root ball and refresh the soil during repotting. Trim any dead or overly long roots to encourage healthy growth.
In winter, reduce watering and fertilization as growth slows. Move the plant away from cold windows at night to avoid temperature stress. In spring, resume regular care and consider moving the plant outdoors temporarily if temperatures are mild, but acclimate it gradually to avoid shock.
