So next time you buy or receive a bunch of roses, remember the precision of this logistical chain.

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Picking up a pink bunch of roses, Hess shows me he'll be looking at leaves and stems for plant rust, mildew, whitefly and many more bugs.

CNN: Tracking love across the globe: A complex business

Six-year-old Zara Williams, from Goxhill, had been waiting with her family since 09:30 GMT to meet her and present the royal visitor with a bunch of pink roses.

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