The nursery approached Malcolm Scott to handle what they perceived to be a tricky application.
Nursery manager Jamie Bullard said: "We know how to grow plants but we don't know how to get planning permission. We are very happy with the result and we are hoping to get the tunnels built in May or June."
The new tunnels approximately double the production area and will help the business "kick on."
Bullard added: "It's a youngish nursery and things have been going well. We are still up on the year so far so we are now looking to move on to the next level."
The company supplies local landscapers and garden designers with trees and shrubs.
And the new tunnels will be used to grow larger specimen plants to help develop their local authority market.
Malcolm Scott town planner Tracy Hubbard said the height of the new tunnels had caused some concern for planners and their key role had been to present an expert case for the horticultural need for the increased height.
Van Arnhem owner Spike Verhage added: "They provided an excellent service acting as go-between between ourselves and the planners to overcome their initial concerns about the development."
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