If you are in one of these regions with extreme heat that is also probably contributing. Bottom line, though, it looks bad, but it is largely cosmetic damage. I've planted many trees that look like that during their first season or so if it's hot and dry and I haven't watered enough. They bounce right back, either when wetter, cooler weather returns, or the next year.

Even though it could be fertilizer burn it seems to have come most directly after the neem application so thats my intuition.The thing recommends 4 cups for 100 sq ft I think and my garden is about 75 sq ft and they are in the ground. Could be too much because I didn't apply it evenly around the whole 75 feet only around the plants in rings. I also maybe added an extra cup because I ran out of the fert compost mix and needed to make more. But, I dont know how quickly the fertilizer would get to the roots anyways? Thanks for the help :) so you think they will bounce back? Any good organic fertilizer ideas for liquids? Am I fertilizing enough? Just as a few side questions if u don't mind :)

Brown leaf edges often indicate leaf scorch, something that can happen when a plants roots cannot supply sufficient moisture for the leaves to transpire. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/environmental/scorch.aspx kimmq is kimmsr

Thanks Jay! You could be right there, I guess - perhaps when I first got the plant (& had it indoors) it wasn’t getting enough water... the leaves looked perfect still when I moved the plant outdoors & its been wet weather & received water/misting every day that it hasn’t rained since then... Your suggestion that it comes with a delay would make a lot of sense then... they certainly do love water - I have a few friends who grow them in their ponds & have had great success with them like that! I’ll try just keeping the water up & see if the new leaf coming through now gets the same marks or not... And yes, that is a Zebrina! Can’t say I’ve noticed any different markings on the new leaves, but I haven’t looked for them... I’ll double check when I get home - I’ve got a new leaf just unfurling now on that one. The petioles do all keep those striking markings, new leaves are greener & older leaves the petioles turn more white/light, but still with the dark markings... I love them!