My AC fics alone has:

the entire title of The White Aster of Masyaf

All Asters: Memories, Recollection/Reminiscence, Change, Same Feeling/Sentiment/Opinion, Believing in Love

Exclusive to White Asters: Please Believe Me

Ezio taking care of pink bougainvilleas in The King

Ezio sighed as he gently poured water over the pink bougainvilleas that were unofficially ‘his’. He had been the one taking care of them since he started to join Moussa in caring for the indoor garden. It wasn’t like there was anything else they could do but wait after all. In the past couple of months, Lara had been put into the Animus twice but that was all.

All Bougainvilleas: Passion, You are All I See

Exclusive to Pink Bougainvilleas: Overflowing with Charm, You are Full of Charm

The small white flowers (baby breath) Desmond planted in fiat mihi secundum verbum tuum

These flowers were just about to bloom such nice small white flowers all bundled together.

They were simple yet Desmond quite liked them.

Baby Breath: Innocent, Gentle/Kind, Happiness, Gratitude, Pure Heart, Trance/Ecstasy (like a dream-like state of pleasure)

And now, my next multi-chaptered AltDes has this:

“No, I… do not think so.” Malik shook his head before admitting, “It’s just… the flower carved on the lid…”

“I’ve seen it before. I believe it’s a native flower from where the Crusaders are from.” Malik informed them, his eyes trained on the box even as Altaïr placed it back inside the light red bag. Malik finally raised his face to stare at Altaïr as he said, “They call it St. John’s wort. They say it’s good for minor cuts and they’re usually burned during midsummer eve to drive away evil spirits.”

“Oh. That’s nice.” Kadar smiled brightly before tilting his head when he noticed Malik’s frown, “What’s wrong, Malik?”

“To the Crusaders, yes, it’s more or less a blessed plant but I know a foreign merchant that sells dried flowers of them.” Malik informed them, “He said, in his country, that flower symbolizes sadness.”

“Sadness?” Kadar repeated with wide eyes.

“‘To stop the sadness or to heal the sadness…” Malik recited before saying, “Those were the two main meanings of that flower.”

St. John’s wort: Secret, To Stop The Sadness/Sorrow, To Heal The Sadness/Sorrow

(I'm not counting Yew Branches since I used the western meaning of yew for that one)

(I guess I should be happy that Zero Eclipse didn't get hit by my hanakobota weakness. Then again... it's filled to the brim with Vega-Altaïr symbolism and I mainly use the tanabata star-crossed lover story for that one)