Root Rot

Overwatering

To address root rot, start by ceasing watering immediately and allow the soil to dry out. If the plant is severely affected, remove it from its pot, trim away any black, mushy roots, and repot in fresh, well-draining soil. Ensure the new pot has adequate drainage holes. Going forward, water only when the top inch of soil feels dry to the touch, and avoid letting the pot sit in standing water.

Crispy Brown Leaf Edges

Underwatering

Calathea Medallion plants thrive in moist soil conditions but do not like to be waterlogged. To address crispy brown leaf edges caused by underwatering, establish a regular watering schedule that keeps the soil consistently moist but not soggy. Use room temperature water to avoid shocking the plant's roots. Consider using a pebble tray with water or a humidifier nearby to increase humidity around the plant, mimicking its natural tropical environment. Adjust your watering frequency with seasonal changes, as indoor heating during winter can dry out the soil faster.

Spider Mites Infestation

Spider mites are tiny arachnids that thrive in dry, warm conditions. They feed on the plant's sap, causing stippling, yellowing, and eventual leaf drop. These pests are often introduced through infested plants or contaminated soil.

To manage spider mites, first isolate the affected Calathea Medallion to prevent the spread. Increase humidity around the plant by misting it regularly or using a humidifier. Wipe the leaves with a damp cloth to remove mites and their webs. Apply insecticidal soap or neem oil, ensuring thorough coverage of both sides of the leaves. Repeat treatment every 7-10 days until the infestation is under control. Regularly inspect the plant to catch any future outbreaks early.

Leaf curling

Low humidity

Calathea Medallion thrives in high humidity environments, often found in its native tropical habitats. To address leaf curling caused by low humidity, consider increasing the humidity around your plant. This can be achieved by placing a humidifier nearby, grouping plants together to create a microclimate, or placing the plant on a pebble tray filled with water. Ensure the pot is sitting above the water line to avoid root rot. Regular misting can also help, but be cautious not to overdo it to prevent fungal diseases.