When woodchips are decomposing in soil, the process use up the available nitrogen around. Which which is why it's better to use woodchips on the surface as mulch, so it won't affect the nitrogen level around the plants root. However, once the woodchips are completely broken down more nitrogen will return to your soil, but that may take a while for you.

For the moment you want to use some fertilizer that is high in nitrogen to help your plants, like blood meal, feather meal, cottonseed meal, or fish emulsion (if you don't mind the smell). Probably liquid fertilizer is better in this case if your plants are already set where they are.

Thanks. that's the kind of info i was looking for.