Turn your dehydrator on so it's ready when you have your trays filled. I have an Excalibur Dehydrator and it states to dehydrate blackberries at (135°F) = (57°C) degrees. Please check your brand for the correct temperature.

Sort through the blackberries and discard any damaged ones.

Wash and drain the blackberries.

Layer the blackberries evenly on your dehydrator racks.

You want them to be crisp and leathery. These took about 20 hours to dry. The time will always depend on the humidity of the room you are dehydrating them in.

If you live where it’s HUMID: “To condition the fruit, take the dried fruit that has cooled and pack it loosely in plastic or glass jars. Seal the containers and let them stand for 7 to 10 days. The excess moisture in some pieces will be absorbed by the drier pieces. Shake the jars daily to separate the pieces and check the moisture condensation.” https://nchfp.uga.edu/how/dry/pack_store.html

I used to live in the DRY DESERT: I set my fruit and vegetables on my countertop for 5-7 days. Ten days is even better to make sure everything is dry before using your FoodSaver unit.

Then I used my blender to make blackberry powder. Be careful when you remove the blender lid as the powder will poof in your face, literally.

But boy does it smell fabulous! I like to use my blender to make enough powder for the month. Please remember, it’s very concentrated so you will use very little powder in your food items or recipes.

You can also use your oven by propping the door open with some foil to keep it ajar and setting the temperature as low as possible. Keep checking your blackberries often if you use your oven, they will dry a whole lot faster.