My dehydrator and I are on a first-name basis. My father gave me one when I left home and I still use one. One of the girls came with me to the Shore this weekend and I have a gazillion blackberries bushes that are growing on trellises to keep them neat. And we picked enough to make 3 cases of blackberry jam. Yep. Thirty-six jars.
You should totally grow them! They are so easy and abundant!