Root Rot

Overwatering

To address root rot, start by removing the plant from its pot and trimming away any black, mushy roots. Allow the healthy roots to air dry before repotting in fresh, well-draining soil. Ensure the pot has adequate drainage holes. Going forward, water your Philodendron Lemon Lime only when the top inch of soil feels dry to the touch, and avoid letting the pot sit in standing water. Monitoring soil moisture before watering can prevent recurrence.

Leaf Spot Disease

Fungal or bacterial pathogens

To manage leaf spot disease, start by removing and destroying any affected leaves to prevent the spread. Improve air circulation around your plant by spacing out your plants and avoiding overhead watering to keep the foliage dry. If the infection is severe, applying a fungicide or bactericide, as appropriate, following the manufacturer's instructions, can help. Ensure your Philodendron Lemon Lime receives adequate light and avoid over-fertilization to keep it healthy.