Q.Old Yellow Alamanda Looks Like It’s Diseased
HAs yellowing, withered leaves and undeveloped blooms. This plant has been in the same location for 20 years but has always had a lot of beautiful blooms.
GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 14, 2021
I can't tell if it is in a container or planted outside. If it's in a container, try changing the soil. If it's outside, check closely for insects or mite damage. They are prone to spider mites and white flies. Spraying with Neem Oil may help.
https://plants.ces.ncsu.edu/plants/allamanda-cathartica/
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm
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