Q. I have a pistachio tree and lots of pistachios (grow) on the tree, but when I open the shells there is nothing inside, just a tiny bit of seed. I don’t know what’s going on. Can you please advise ...

A. What you are seeing is what the pistachio industry calls “blanks.” It’s an indication that the tree wasn’t pollinated. Many trees, including pistachios, require both a male and a female tree to ...