Just rewatching the Season 2 finale, and am shocked that Gideon knows nothing about flowers, his descriptions ( kind of like a dandelion, with yellow floofy petals and a black dot in the middle, but not a weed) are dreadful, and Hotch has to talk him through his purchase ( chrysanthemums are not a good flower to buy for a date, Gideon!) and thank goodness that Gideon didn’t buy Garcia flowers when he had to be prompted to get her a gift when he invaded her office and really annoyed her in Season 1! It just makes my heart happy that Hotch knows about flowers, I can see him being really clued up about all the meanings ( yellow roses for friendship) as he was, canonically, a bit of a nerd growing up, with his coin collecting.
It’s also really poignant to see the first victim on the list, I got total Haley parallels/foreshadowing.
Gideon and Garcia actually getting on and him listening to her, explaining things to her in a non-patronising way and appreciating her input just warmed my heart. I like to think they got closer after the Tobias Henkel episodes, as they have a sweet moment when watching the video where he puts his hand on her shoulder and she reaches her hand up to squeeze his, so they are drawing comfort and reassurance from eachother because of their mutual affection for the person onscreen.