Two or three times a year, he and fellow scent expert Robert Calkin explore David Austin's 2-acre show garden, stopping to smell the roses. The purpose is to oversee the company's official description of each variety's fragrance, putting smells into words.
There are no rules for what they do; there are no restrictions. Breathe deeply and enjoy.
"You sort of think about wine tasting and tea tasting, and they have to abide by a very strict routine," said Marriott, who has been with David Austin Roses (davidaustinroses.com), in Shropshire, England, for 27 years.
"I've been sniffing roses for many years, and there's no special technique. Just be open to it."
That means there's no problems if he and Calkin come away with two different impressions after sniffing the same rose. One might detect a hint of bananas. The other might smell apples. Even roses on the same bush can vary.
"You might smell one on a bush, and it might smell like nothing," Marriott said. "The next one might have a wonderful fragrance. And the next one might smell like something else. If you smell a rose and smell nothing, don't be put off. Just move on."
A rose's scent can change from hour to hour. It depends on the weather (current and recent), the stage the flower is in (younger flowers are better than older ones) and the type of fragrance associated with the rose.
A fragrance can get stronger or weaker or leave a totally different impression over time as the rose matures.
Marriott had some suggestions for gardeners wishing to get the most out of their roses.
Don't give it a quick, tentative sniff. Sniff it, think about it, sniff it again and see if you can identify what is there. "It doesn't matter if you can't; you're just appreciating the fragrance," he said.
Go beyond your initial impression. It might seem to be one fragrance, but a second sniff might detect more subtle notes. He says he'll often pick a rose and get one scent, then take it into the house and get something else.
Take it for a ride. "Pick it and put it on the car seat as you drive home," Marriott said. "As you drive, you can pick up that fragrance on the ride. It could be the enclosed atmosphere."
With so many new varieties of roses coming on the market, fragrance may be getting nudged out of the way by looks and hardiness.
"You are given a rose or find a rose in your garden, and the first thing you do is put it to your nose," he said. "If there's nothing there, it's boring, really. As beautiful as it might be, you're really losing out if there's no fragrance.''
There are five English rose fragrances, according to David Austin Roses. A summary:
Myrrh: An aromatic, aniselike scent; among roses it's found almost exclusively in English roses.
Fruity: Because the rose is related to apricots, pears, apples, strawberries and others, fruity notes often surface.
Musk: A romantic scent, it often comes from the flower's stamens. People are especially sensitive to the scent.
Old rose: The classic rose fragrance, it's found almost exclusively in pink and red roses.
Tea rose: A strong scent -- like that of fresh tea -- that often dominates a flower. Other fragrances can become evident over time.
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