People don't always realise but you can eat a certain amount of blackberry leaves (and use them as herbs to make tea for diarrhea and stuff). The tea usually tastes and smells pretty good (kind of like blackberries do, but much milder).
In the past, I had made tea from lots of our thornless blackberry plants' leaves, and it tasted great. However, the last times I tried it, it smelled and tasted like sulfur and was not pleasant. It was the leaves (not the water). I think the plants may have been transplanted, and this affected the taste.
What could be causing the sulfur smell/taste? What is it about the soil or environment that could be doing it? Is it actually a high sulfur content in the soil or something else? How could this be remedied (without transplanting)? Do you supposed it will go away over time?
The fruit seems to taste fine. There might be a stronger sulfur taste in the fruit than before, but it's not very noticeable, if so.