We found this little shop in December with its herbs and small pot plants displayed out front. I did not find a translation for "graineterie" and I cannot get to my Larousse (from my Baltimore hotel room!)
Thank you for any help you can provide in this translation.
UPDATE: Thanks to Vreni, Malyss and others, we can definitively say that "graineterie" in this instance is a store in which seeds are sold. Thanks to Starman, I found my beloved Larousse on-line for free. It is interesting that Malyss' dictionary from the late 1800s and the internet dictionary produced the translation, a centuries-old translation! Merci a (no accent marks on laptop) vous. As we say in the South... "Thank you to all y'all!"