Where do you get all the flowers?

Yes, some. The ones you mentioned -- snowdrops and crocuses can sometimes be found in the winter and spring seed packets

"calaprfy;c-17065781" wrote:
I cheated, searched for all flowers in the gallery, and downloaded them.

I don't wanna cheat, I wanna play. :)

Some of the flowers require grafting, others require certain packs. I think snowdrops require the Seasons expansion, for example. You can always check a guide for more specific info:

https://www.carls-sims-4-guide.com/skills/gardening/?cmtx_page=5

You can buy packets for each season. Also, set up a holiday with gnome appreciation as one of the activities. Once you're on good terms with the 3 gnomes that show up, they'll drop plenty of packets.

"Simpkin;d-959337" wrote:
Like snowdrops and crocuses and stuff? Not everything grows in the wild as far as I understand. Do you get some only by grafting?

I cheat and use bb.showhiddenobjects and get them there.

I got them from seed packets. I think Patchy might give them too if you check his pockets. Others I graft.

I got crocuses from the spring Easter bunny who threw them around my yard