My plants especially strawberries has been turning brown ...
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Hey, Athex! A lot could be happening here. Is it cold outside? If so, it could be too cold for the plants to thrive. If not, how often are you watering? Over or under watering can cause leaves to wilt and die off. Third could be fungal or pest related, either in the ground or on their leaves. When you water them, do you get water on the leaves? This can create an environment for fungal infections. Hope this helps!
It happed to my strawberry plant but are you using drainage because drainage is bad for strawberries