How to Prep a Tree in the Winter

The garden is on the easter side of the country, and protected from most of the sotof north east winds. The gravel all the was prept, decent amount of organic matter. It actually was well rotted horse manure. And there's one little area behind me that just as you go underneath these yew trees here,. that i probably have to just keep an eye on. Apart from that, the rest of it just has to get on with it.