If you haven’t got the space or the time then before spreading the mulch use a fertiliser rich in nitrogen such as a complete slow release product or manure {pellets or aged – not fresh it will burn the plants}. This will prevent the mulch sucking nitrogen out of the soil to aid the decomposition process.
The leafy mulch has more vitamins for the plants, but it will decompose quicker than woody mulch. However woody mulch is low in nutrients.
Species of trees for mulch – any mulch is good for the garden – all mulches will be freshly cut and will require fertiliser if spread within a week after delivery to prevent plants yellowing and slowing growth down.