Anonymous flower delivery: what actually stays hidden
An anonymous bouquet is not a bouquet without a card. It is an order where it has been decided in advance what the courier says when asked who sent it — because that question is always asked.
What the recipient sees
Flowers, a card and a courier. Your name is not spoken and does not appear on anything handed over. Your phone number stays with the florist, who needs it only to confirm timing.
The courier's answer is agreed beforehand: the sender asked not to be named. Having one prepared sentence works far better than a shrug at the door.
The unsigned card
A blank card looks like an oversight. A short line with no signature does not. One sentence is enough for the recipient either to guess or to understand that the bouquet was sent deliberately.
Details known to two people work well. Hints that could be read as pressure do not: anonymity amplifies whatever is written, and a line that would have been a joke from a named sender reads differently without one.
When not to send anonymously
There are situations where an unknown sender is frightening rather than flattering: someone living alone, someone recently out of a relationship, someone in a public role, someone already dealing with unwanted attention. In those cases the mystery is a burden.
And plainly: do not send anonymous flowers to someone who has asked you not to contact them. Flowers do not soften that, and removing your name from it makes it worse rather than better.
Placing the order
Mark the delivery as anonymous and write the card text without a signature. If the recipient is out, the courier will rearrange the time but cannot explain who sent the flowers — so choose a window when they are certainly at home.
Revealing it afterwards
The most common pattern is an anonymous delivery one day and a call the next. Used that way the flowers open a conversation instead of leaving a riddle. If the bouquet is going to Sao Paulo and you intend to call, have it delivered in the morning — by evening the recipient will already be waiting to hear from someone.