Since the Angara are pretty open in terms of emotions I can imagine how perplexed they would be over how humans would use flowers to convey hidden meanings to their lovers/family/enemies.
Jaal would ask who decided what meant what, when it started, and why ‘tip toe’ around your affections for another? He’d spend an eternity figuring out the various kinds of flowers and their meanings, somehow roping Vetra into snagging a few flowers brought over from the milky way. Secretly whenever Ryder has an awful stressful day and she walks into her room- tons of flowers nestled neatly into little vases (blame Lexi who thought it best if they were in vases to keep them alive a little longer) all over her desk and nightstand. Some are known to her. Red roses: passionate love, Asters: contentment, Yellow Tulips: Hopelessly in love.
And then there are the odd ones. Flowers and plants unknown to even humans. Vivid in color and alien in nature similar to the Angara. When she sees Jaal next she asks him about the strange flowers in her room. Warmly Jaal is all too eager to tell her about them, about how each one represents a deeper part of oneself- each petal signaling a year of one’s life in motion. The pain, the hope, the devotion, the courage, youth, stubbornness, and pure joy she brings to him. He then explains to her his people don’t have meanings for each flower like humans do but those flowers- vivid blues and pale white, those called to him and in turn reminded him of her. And the longer he looked at each petal, each speckle and vein running through them, he could see everything he loved about her in them.