Have you done a PH test? Lime will change (raise) the PH. It takes a few months for the change to be noticed. The finer the lime, the quicker it works. Wood ashes can also be used but typically Line is used.

definitely a good idea to do a soil test to see where you're at.
Wood ashes work faster than lime, so you could use some of both, for short term ammendment and then the longer term fix. (do they also make "quick acting" lime? For some reason I think I've seen it.) I started with a PH of 5.4 and put down regular dolomitic lime in March, and had a fine garden that year. Even if it takes 3 years to complete its job, it does start acting right away. The normal time to add is in the fall, but just do it asap.

And if you still have too low a ph you can choose low ph veggies like potatoes to grow :)