Pinky-red Gloriosa and varieties of roses were among the flowers chosen for the colourful display.
“To the students, it was just incredible to win silver; I was just grateful to have won a medal,” Mr Landers said.
“Only the top four positions go through to the Chelsea Flower Show in May and it’s between me and one other florist,” he said.
Earlier this year, Mr Landers won his second silver award in the open floral design section of the Melbourne Flower Show.
Mr Landers said day and evening classes attracted students across Perth including Mundaring, Glen Forrest and Kalamunda.
“I never expected the Perth academy to be so popular, it’s bigger than ever,” he said.
“We’re planning to run courses across regional WA soon – the response has just been incredible.”
A recent workshop with the florist proved popular at Laurelville Manor in York.
Mr Landers was aged 17 when he opened his first floristry in Perth.