Five hundred and one roses: the delivery is planned before the flowers are
An order of this size is arranged in the opposite order to a normal one. With a bunch, you choose the flowers and the delivery follows; with five hundred stems, the address, the access and the hour are settled first, because they decide what can physically be built.
The conversation starts with a floor plan, not a colour.
Questions that come before the flowers
Where exactly is it going to stand? Is there a lift, and what are its internal dimensions? How wide is the doorway, and which way does it open? Is there a step or a gravel path between the vehicle and that spot? Who will be there to receive it, and can that person be reached by phone at the agreed hour?
None of this is bureaucracy. Every one of those answers changes the build: a narrow lift means the arrangement arrives in sections and is finished on site, a step means two carriers instead of one, and an inward-opening door means somebody has to be standing there already.
The vehicle and the load
Flowers of this quantity travel standing in water, in buckets or deep crates, packed close so they cannot tip on a corner. Lying them flat is not an option: heads bear the weight of the stems above them, and the marks that leaves come up brown within hours.
That is why an order like this needs a van rather than a car boot, and why the loading itself takes time before anyone sets off.
Two people, and a slot rather than a time
One courier cannot carry this. In practice the delivery is made by two, and the piece is either assembled on arrival or carried in parts and joined at the spot where it will stand.
A surprise handover is difficult to arrange honestly at this scale. Somebody at the destination usually has to know, if only to hold a door open and clear a corner, and the surprise is preserved for the recipient rather than for everyone present.
Timing works as a window rather than a minute. A build on site takes as long as it takes, and a courier standing in a corridor with five hundred stems waiting for a phone to be answered is losing flower life by the minute.
After the delivery van leaves
Somebody has to water it that same evening. Foam-based work is watered from above until it stops absorbing, and containers are topped up to their original level, which at this volume means litres rather than a jug.
The piece also has a working life measured in days, not weeks, and it is at its best on the first two. Planning the event around that, rather than delivering three days early to be safe, makes more difference than any choice of variety.
The last thing worth agreeing in advance is what happens when it is over. Someone will need to break it down, and the roses that are still firm can be recut and divided between ordinary vases or sent home with guests, which is a much better ending than a skip behind a venue in Bucharest and a floor covered in petals nobody had time to sweep.