We have fruit trees, plum, pear, apple, morello cherry and sweet cherry. The plum has had lots of fruit over the last 5 years but didn’t fruit this year and looks unwell, the pear hasn’t ever fruited (5 yrs old) the fruit arrives but is blown off, the cherrys are good as are the apples. We would love to plant more trees and were thinking of hazel nut or some other edible nut, what would you recommend and how deep to plant them etc