The 23 day trek in Nepal begins on 23 October.
He said: "I will have no home comforts and very little contact with the outside world! No wine with dinner, no comfortable mattress, only primitive facilities and a demanding trek so it's going to be a real personal challenge.
"This is a long time away from my business but it will continue to run as normal with my dedicated and reliable staff covering for me.
"Yes it's going to be tough, but I am I doing it to support a great cause. As a supporter of Greenfingers charity, I have seen the difference the charity makes to the lives of children living with life limiting or life threatening conditions. The charity creates magical, inspiring and therapeutic gardens for children and their families who spend time in hospices and they have a waiting list of hospices who need their help now.
"I am funding this trek myself but raising money for Greenfingers "A Million Moments Appeal" which aims to raise £1m to enable the charity to build 15 more gardens right across the UK.