From the Owl_Tauri Valentines Day post
The above valentine is posted to the bulletin board. There is a label stuck beneath it reading:
To Slytherin House
Others are sent to: Severus Snape, Regulus Black, Rabastan Lestrange, Rodolphus Lestrange, Abraxas Malfoy, Lucius Malfoy, Narcissa Malfoy, Draco Malfoy, Evan Rosier, Antonin Dolohov, Igor Karkaroff and Gellert Grindelwald.
The flowers are:
Arborvitae for Everlasting Friendship
Tulip Tree for Fame
Mignonette for Worth
Bee Orchid for Industry
Aconite for Misanthropy
Pear Blossom for Lasting Friendship
And finally a Bay Wreath for Glory
There has also been a small garden started with just these flowers and trees outside the Slytherin dungeons.