Why Is My Allamanda Plant Turning Yellow. If your banana plant leaves are turning yellow the main reason is that its not getting the adequate nutrients it needs. Damage is usually limited to a single section of the plant rather than the entire plant as in the case of a lack of water nutrients or sunlight.
15072020 Also called golden trumpet allamanda grows fast and offers spectacular blooming in summer. If the plant is getting too little water leaves will curl as they yellow. If the older leaves on your plant are turning yellow and the new leaves are very light green it could be a sign of a nitrogen deficiency.
There could be many reasons cactus plants turn yellow.
Eventually this damage can cause the leaves to turn yellow and brown. Temperatures below 45 degrees Fahrenheit often promote more leaf drop and a light frost may fully yellow a plant. Water light pests and potting. Yellowing leaves are a sign that your plant is sick and needs special attention to recover.