Q.Can Marionberries Revert Back To The Ollalie Or Chehalem Berry?
My marionberries in the last 2-3 years appear more like a blackberry in shape–more rounded and smaller. They don’t have the elongated shape. They still have the tarter taste and flavor of the Marionberry. What has happened?

Certified GKH Gardening Expert
It sounds like the soil fertility needs to be improved. These articles will help:
https://www.gardeningknowhow.com/edible/fruits/blackberries/what-are-marionberries.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/macro-and-micro-elements.htm
https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm