Ugh, really hate that. I know it's a way to try and prevent cheating, but the times I have to change dses this happens. I have ten patches of berries with growth mulch and had to switch dses for wifi use and then back for transfering pokémon. I've noticed the berries don't need watering. I hope they don't get ruined.
EDIT: Berries finished growing, so it didn't ruin them just made them take longer I guess. And I was trying out the growth mulch too to see how much faster, ha!