If you want some peace of advice, save up your big manyus for tachibana, the next event girl
But hey, that's just my opinion. And also, if moonflower is a potetial waifu of yours than who cares about stats, right?
I think we can use them now and still have enough time to hoard a decent amount before the next girl arrives (unless she's given out like Mountain Lily was). Besides, my capacity can't stand much more hoarding haha.