Hello! So I don't usually have people visit or get visitors on New Horizons but I wanted to give some flowers to friends possibly and I don't know how to give them the whole flower?
I'd recommend doing this over best friending them. Takes longer but if you don't really know or trust the person you're trading with, who knows what they could do while best friended.
If you are ok with them digging up your island, make them best friends so they can use their shovel. If you don't want to let them do it though, I'd suggest digging them up yourself and delivering them to your friends.