Monday they seemed to adjust the catch (and spawn) rates way up. I finished Monday. Thankfully, cuz now I'm getting 3 or 4 spawns out of 20 and I've had many catches with nothing or 1 caught. Just wish I could catch more, so I can help friends. Still trying, but they nerfed the rates big time, IMO.
That image was from 20 flowers and only 8 spawned. I finished the event shortly after I posted that (I needed only 3 more navy). My friends and I do share with each other a lot but sometimes it doesn't help when you can't catch any they share with you so you can't share back. I'm sure they're having the same problems.