The only way to fix it in 3 months is to remove a substantial portion of the clay and rebuild the beds out of good growing media. I did that and dug down 24-30 inches and removed that clay, had a truck load of a good composted soil delivered, and then hand tilled in the material mixing in some of the remaining clay in the bottom 6 inches or so. A little clay has some nice properties like holding water.
Barring a complete redo, one additional item I would consider is a product called expanded shale. It will till in with the clay and help break it down over time, especially if you add lots and lots of good materials like others have mentioned above me. Good luck.
Dewayne mater
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