Squire, who is 80 this year told Bishop Perrin Primary School in Twickenham what it was like when the school was bombed during the war, rationing, and why growing your own food was so important.
The children then helped him to plant a jasmine archway in Squires' pots at the entrance to their school garden to celebrate Squire’s 80th anniversary.
He said: "It was absolutely lovely to be back at my old school, and to talk to the children about my time here during the war, and about gardening. The children were very enthusiastic about gardening, and it’s fantastic that they have their own school garden and even a gardening club.
"I am so thrilled that Bishop Perrin Primary School children can enjoy this beautiful jasmine archway in their school garden to celebrate Squire’s 80th anniversary. My father, D.J. Squire started the company in 1936, and my daughter Sarah is deputy chairman, so it’s still very much a family business with its roots in Twickenham."