JBP watering

I know when over watering a jbp, the needles turn yellow and pretty quickly die off. What does the plant do when it is too dry? I have a jbp and I basically watered it only a handful of times. Maybe 10 times over the entirety of summer in Ohio. It did well and pushed new growth. However, I am thinking I may have missed some opportunities by not watering more. What signs should I be looking for from the tree?
 
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