Having accomplished her objective of obtaining celebratory flowers, REIMU...

...left the Sanzu River behind her in high spirits.

I don't want them to get hurt by the wind, so I'd better put them away...

But I've got a lot of spare seeds, what a waste...

...You need ghosts to make them bloom and all...

Seed sack

Somehow or other harvested by a shrine maiden on the way.

It's something that happens often in Gensokyo.