Trees love mulch and if you want them to thrive then spread some around the base of your tree after planting. 
A good guideline is a layer around 50mm to 100mm thick being careful not to touch the trunk.  Make it a regular habit to mulch around 2-3 times per year.

Not all mulch is created equal but nutrient dense and fertile organic materials include compost mulch, bark mulch, sawdust, decaying leaves, grass clippings and straw hay.  

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The benefits of mulching include:

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• Keeping the roots moist

• Encouraging worms to burrow and recycle their waste as rich fertiliser

• Insulating the soil to provide a buffer from hot and cold temperatures

• Inibiting weed growth and preventing competition for valuable nutrients

• Providing a barrier to reduce damage from lawn-mowers