Q.hazelnut tree watering
How often should I water my plant transferred from ground to pot? I transferred a hazelnut plant from ground to pot. I live in California San Bernardino Mountains. Climate in spring is mild, about 65 to 75, and in summer 85 to 95 degrees.

I would keep the soil consistently moist, but not damp/soggy - be careful not to over-water. You should never let the soil of a hazelnut dry out completely. The soil you use should be well-draining.
For more information on hazelnut care, please visit the following link:
https://www.gardeningknowhow.com/edible/nut-trees/hazelnut/grow-hazelnut-trees.htm