Philodendron prefer to be in bright, indirect light. If multiple leaves turn yellow, it may be getting too much sunlight. Higher light will help your Philodendron produce more leaves.
Philodendron require an average amount of water, usually about once a week. Water your Philodendron when the top inch or two of soil has dried out. If the leaves are yellowing and drooping, your plant may be receiving too much water. If the leaves are browning and crisping up, it may be getting too little water.
Average household humidity levels will be fine for your Philodendron. However, to encourage larger leaf growth increase humidity by misting your plant or wiping the leaves with a damp cloth.
Philodendron grow well in warmer environments, in the 75-85 degrees Fahrenheit range. Keep your Philodendron away from exposure to drafts below 55 degrees.
Fertilize with a standard balanced houseplant fertilizer once a month in the spring and summer. During the fall and winter, reduce frequency to every 6-8 weeks. If your philodendron is producing small leaves and growing slowly, this is a sign it requires more nutrients.
Philodendron can cause adverse reactions to pets including vomiting, and skin and mouth irritation. Keep out of reach of animals.