Originally Posted by Ampchan

You have to remember that Rarity growth is added at a per unit basis, and considering how well they have handled Blooming, I would not have high hopes regarding when she will get the rarity growth feature.

That's Ok Ive got Snowdrop, Bonci, Epidendrum (swimsuit), and Lyco (miko) to keep Kerria company until they give me an upgrade.