I didn't know find out about this until yesterday. Several days ago, while I was trying to breed orange roses...they would spawn nothing but white roses. I did a quick google search and answers were mixed. So I just assumed orange hybrids couldn't breed according to thonky. Now, I hadn't touched the game in awhile, forgive me, and I just got back into the swing of things. Then yesterday, I brought over some blue roses from my main to my second town to breed, and after time traveling for 2 weeks or more. One patch would produce nothing but white roses...again. I did another quick google search, and it's possible they might be hacked. This has gotten me paranoid, I am scared they are mixed with my own bred hybrids. I don't want that trash in my town, and I definitely don't want to give anyone that trash. Sadly, it seems the only way one can tell if it's truly hacked or not is to breed it several times.... Which I have done, and used my weed killer... my feet. I have to say, it's weird forcingly killing hybrids. But what else can you do. :/
As for the hybrid bags, you get them from Leif during Weeding Day. I'm not sure, but I think you get them if you or your team score poorly.