Newly planted Cassia tree doesn’t look good
I'm in S. Florida and planted tree about 5 months ago. Some of the leaves are yellowish with black speckles and some of the ends of branches are black. Attaching a photo. Watered as advised. No fertilizer yet.
Certified GKH Gardening Expert
Sometimes, this can be of no fault to the gardener. Soil can be contaminated before planting. There are many things that you can do to combat soil pathogens, but I prefer a simple dusting of wettable sulfur and dolomitic lime.
This will treat the illness, but the dying leaves will not recover. They will fall off eventually. New growth will be unaffected and you will know the treatment is working.
This collection of articles will give you an idea of how to care for these: https://www.gardeningknowhow.com/ornamental/trees/cassia