If it is just from over drying I, I will re-introduced moisture by using little terra-cotta medallions that raw makes. Or I think you can just break up a flower pot. But I will soak them in distilled water and throw them in with the weed and monitor the humidity. It’s a slow process using them but eventually the humidity gets up to where I want it. you may not recover all the Terps and flavor, but it always works pretty well for me. I don’t like throwing too much moisture in at one time. I want it to be a slow rehydrating process. But even if it’s brown and dry, it will still get you high! Anything is better than letting it mold up!