Lemi ask again before people get theoretical..

Deliveries might be on hold during current CZ lockdown. Flowershops function, though, not sure about deliveries.

OP - cash is considered really poor taste. Otherwise a card with "Upřímnou soustrast" with a box of chocolates will work. They might pay an import tax on it, if sent by post. Post delivers in a limited way now.

It is kind of you to think about your friend.