I was also wondering the same thing about what they are using for the nutrients for the fruit, but didn't ask.Thank you, lovely @dswigle, for your visit and wonderful comment and of course for creating the awesome contest.
Wow. That is so amazing for you to have your own raspberries, blackberries and blueberries. I used to have my own raspberries and tried planting my own blueberries, but year after we planted the blueberries, we moved, so I don't know if they actually grew because where I lived, (summer is very short) I didn't know anyone who had blueberries, only raspberries.
But we had great time picking the fruit and we already ate all the fruit within 2 days (it was so good), so we have to go back to pick some more and then come back when the blueberries come.
I have never made my own jam yet, but maybe when I go next time, I will try to make my own jam, so thank you for the great idea.
Have a lovely weekend, dear @dswigle and thank you again for your incredible support (tipu) and for the beautiful contest.
Thank you for being such a beautiful, giving and inspiring person and contributing so much to this community.