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花
Used when you have a very old 花入れ, if it was a gift from the guest, or if the guest brings flowers (so it's a catch-all 花入れ飾り).
But it can also be used to pass the time, if it is raining during 中立
Carry in tray, first guest puts flowers, ask to add water, but guests doesn't do it. Host views flowers, guests tells him to rearrange it and add water, host adds water. Leaves, guests view flowers.
At the end of the gathering, if the host doesn't ask for the flowers to be left, the arranging guest will take them out, wrap their stems in かいし and leave them on the floor.