#in my hc most senju have a minor unexpressed form of the mokudon

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Garden

The Senju have a tradition of a courtship garden.

Well... It's called a "tradition" but that's actually just to hide the fact that it's something their bloodline compels them to do.

When they feel strong affection towards someone, they feel the urge to nurture and grow plants on their behalf. This doesn't actually have to be romantic affection. Expecting mothers are some of the Senju's most prolific gardeners.

Hashirama continues to maintain plants for all of his brothers.

He's also the first person to realize that Tobirama's in love. Granted, it's hard to miss the abundance of flora that have suddenly sprung up around Tobirama's home. He doesn't even seem to realize it himself.

The main flowers are:

Tansy: resilience, a fresh start

Red Amaryllis: pride, splendid beauty, determination, worth beyond beauty

Red Carnation: love, passion, admiration, courage

Red Snapdragon: love, passion, deviousness, grace

Purple Orchid: respect, dignity, confidence, peace and forgiveness

Peony:

Meanwhile, the Uchiha value something made with one's hands. Something that shows your understanding of the person in question. For example, one could write a song to represent them or paint a mural of a memory you share together. I'd say more, but I really think my ideas for Uchiha courtship should get it's own post.

Either way, it's not like Tobirama is giving Izuna the flowers (yet). He just finds himself compelled to tend to the garden after every time they interact. Surely there's no correlation.