Hard to say without seeing the image or just a section of the image.
But one good technique is go out and shoot some similar fine foliage against a NOT blown-out sky and rubber stamp and/or mask it in.
Or select the the sky, turn the selection into the black section of a mask, and put a properly exposed sky or a sky-like gradation on a layer just underneath. Lots of techniques to make this work well, your first attempt will be disappointing, but keep on trying. If your sky is not completely unrecoverable, put your original sky on a layer below the masked foliage but with a radical Curves layer applied to bring out the sky detail, the mask above will hide everything except the sky. But getting the edges on that mask just right will take some study.
And masks can often be used to sharpen the apparent edges of foliage.