Chuck is right.
Woodchip is great as a mulch, on top of the soil, as it suppresses weed by two methods; 1) by denying light so fewer seeds germinate, 2) by nitrogen sequestration, which means that annual weed seeds germinate & starve due to nitrogen deficiency. As a mulch that's great, because the sequestration is only over a very thin layer where the soil and woodchips interface, & your plant roots will be out of that range, so fine, but if it is mixed in, the nitrogen shortage can go deeper and cause problems.
Add some nettle tea or urine diluted 10 water to 1 urine & some hen's blood, in order to help the nitrogen levels. Either of the first two will give you a quick fix, whilst the hen's blood will help in the longer term.
The woodchip uses the nitrogen in the decomposition process.