Notcutts said Wootton, who joined from Blacks Leisure on 2007, "has decided that the time has come for him to seek new challenges and he leaves the business with Notcutts’ best wishes".
Silverwood joins as interim commercial director and has experience with Wyevale Garden Centres as interim head of acquisitions and integrations trading from 2014-15, Dreams, Topps Tiles, Pizza Hut, Habitat, Homebase (trading director decorative and DIY 2008-11), Argos (seasonal trading director 2005-07) and BHS.
Wootton has led areas within Notcutts including buying and merchandising, distribution and logistics, marketing and e-commerce. He has also represented Notcutts on the HTA and has worked with the RHS on community engagement projects, including the schools programme.
Chief executive officer Nick Burrows said: "I would like to place on record our sincere thanks to Mark for the contribution he has made to Notcutts over the last ten years."
Notcutts says there is no replacement confirmed yet for Wooton.
Meanwhile, Notcutts Garden Centre Norwich is launching a new display garden on 11 May to inspire visitors with creative ideas for their own outdoor spaces.
Notcutts has planted a display garden featuring 700 plants, designed with four different sections including ‘seasonal colour’ and ‘shady garden’.