I’m on vacation, so only a short written accompaniment today. – Daniel
Similar to the “species tulip” from two days ago, this flower belongs to a “species camellia”, i.e., it is what would be encountered in the wild. In cultivation, however, over 2000 variants or selections of Camellia japonica exist (source: Wikipedia) – an image search gives a hint to the different ornamental forms.

Camellia japonica – Z7 – RHS Index of Garden Plants, Griffiths
Hi, just found your blog/potd because I recently visited the gardens. I enjoyed it very much and like the photos here. If you want to see some of the pictures I took, they are posted here.
Cheers!
Matt
voila si vous pouvez me répondre en francais j ai achetée cette fleur il y a 2ans elle ne grandit pas me fait les mème feuille et elle m a fait des bouton qui sont fanés que doit je faire merci
baivier, you may wish to ask your question on Infojardin.