Q.Why is the new foliage on my Kousa Dogwood stunted and pale.
It is about 5 feet tall. Last year was it’s first year to bloom–with about 5 blooms. Has been in our yard about five years.
Helen

Cool spring temperatures or any winter damage can effect spring leaf out and blooms.
Since last year was your first bloom; it is still a new tree.
A simple soil test can help you determine if a boost of fertilizer may help you tree.
Your County Extension Office can help you with this.
Here are some links to help you.
https://www.gardeningknowhow.com/extension-search
https://www.gardeningknowhow.com/ornamental/trees/dogwood/fertilizing-dogwood-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/dogwood/growing-kousa-dogwood-trees.htm