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As a general rule of thumb, commercial nurseries charge us about 50% of garden centre prices. I am less than surprised that the conceptual (what the flying fuck?) design wasn't inexpensive, the addition of a meaningless word generally means some poor bugger is paying for it. Normal honest(ish) landscapers would sell plants at an approximate mid point between wholesale and retail, a win/win situation for supplier and client.
I would tell them to go forth and multiply, I would expect them to continue to be reliably expensive, yet with wafty bits.
Is that going to make a difference?
Either they're VAT registered, can reclaim the VAT on the plants but will have to charge you VAT or they're not VAT registered, can't reclaim the VAT but won't charge you VAT.