Twisty Baby Robinia

I have a three year old Twisty Baby Robinia and for the first time this year I notice that some of the leaves are turning yellow and falling off. Since it is only July I am wondering if the tree is in trouble. Help would be greatly appreciated. Thank you! Katherine Adele

 

Probably too wet or too dry.

 

Thank you so much. I guess it is hard to be more precise. I know that we have been watering a bit more this year as last year it looked a bit dry. Is there anyway to figure out which it is ---- TOO WET/OR TOO DRY? I so appreciate you taking the time to offer an opinion. Katherine

 

Dig around in the dirt to see what amount of moistness there is below the surface.

 

Thank you. Will do, tomorrow, as soon as the rain stops :)