some fruit don't come from trees

I've been reading Sarah Charlotte's Web at nap and bed-times. Yesterday Wilber got out of his pen and went into the orchard. I was trying to explain what an orchard was. I said it was a place where lots of fruit trees grew. Sarah said, "Not all fruit comes from trees." True, I replied, some like grapes comes off of a vine. "And some, Sarah injected, come from Walmart."