Why santan leaves turns yellow?

Santan leaves, also known as frangipani or plumeria leaves, can turn yellow due to several factors, including nutrient deficiencies (such as nitrogen or magnesium), overwatering, or poor drainage leading to root rot. Environmental stressors like pests, diseases, or extreme temperature changes can also cause yellowing. Additionally, natural aging can result in older leaves turning yellow before they drop. Proper care, including appropriate watering and fertilization, can help prevent this issue.