From Bamboo Feathers: 411y2f
When he was a child, Isao was inspired by a florist named Aiko and fell in love with flowers. After saving his father's company, Isao finally leaves his desk job to realize his lifelong dream of owning a flower shop, opening it in the same location that Aiko's shop used to be.
Right before opening, he finds out that Aiko had ed away when he meets her widower Koutarou and their young son. Koutarou is utterly devoted to his son Zen and carries on the love of flowers that Aiko instilled in him. Thus the new florist Isao falls in love with Koutarou, and tries to win his heart through the flowers they both love.
1 Volume (Complete)

There's zero chemistry between the leads, their so called love for each other makes absolutely no sense, they behave like 6 years olds, so I can't recommend it. The art is pretty, there's fluff, but that's it. I couldn't enjoy this manga at all, mostly because of the lack of feelings (yeah, they say they love each other, but you can't feel any genuine emotion between them, it feels so forced...)
Wow, this was like a huge dose of sugar of the most addictive kind that one just cannot get enough of! It's warm and heartfelt, its characters are adorable, and there are quite a lot of unexpectedly funny moments. Which are all so blinding it might go unnoticed how good the author's storytelling skills are. I'm serious when I say this has one of the best writing chops I've come across recently - the narrative is very clean, effective and all in all very well-rounded. It's not a simple fluff manga; there's a lot more to it.
This was really fluffy, honestly there was parts that i was just like wtf?! in the good way. It's probably because the characters are all so easy going and accepting - definitely no angst in here. Satou and Zen just make me lol, especially satou x'D hahhahaha.
The art is gorgeous. The plot is interesting and fantastic. The characters are very likeable.
Two things I didn't like was how satou was so annoying and clingy. No one likes cockblocks, and he was the biggest cockblock I've encountered yet. The second things was I really wish they had explicit abundant sex.
Well, there's a reason why it's shounen-ai.
I recommend this 100%