Yellow leaves

Question

My outdoor split leaf philodendron’s leaves are turning yellow. The plant is a little over a year old. I don’t know what to do. I cut a few of the more yellow leaves and the stems look fine. Help, please.

Answer 1

It's normal for the oldest leaves to yellow as part of their normal aging process. If the newer leaves are also turning yellow, look into the following possible causes. Too much and too little light can both cause philodendron leaves to turn yellow. So can nutrient deficiencies, as described here:
https://www.gardeningknowhow.com/houseplants/philodendron/caring-for-philodendrons.htm
https://www.gardeningknowhow.com/houseplants/philodendron/brown-philodendron-leaves.htm

Also, check your plant for pests and for the other possible causes of yellowing leaves in this article:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

Answer 2

Yellowing leaves can indicate a watering issue, too much or too little.
Check to make sure the soil is draining properly. If you have mulch down, pull away the mulch to check the soil and keep mulch at least 6 inches away from the base of the plant.
Soil should be moist but well draining.

Yellowing of leaves can also be caused by pests and disease. Look over the plant for any evidence of these issues.
Most pests can be taken care of with Neem Oil.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm