Cannot create seal

I am enjoying the game, but it keeps telling me I cannot seal. And I am trying to put a flower in the middle of nowhere?!?

kinda frustrating

What the game is telling you is if you put a flower in that spot there is no way the bugs can get to the other end of the garden, you cannot completely block it off. I get that message when I have been putting flowers in and then go to choose a bug to target it, if I don't get it in the right spot the game thinks I'm trying to plant a flower. I hope this makes sense.

I am having the same problem. I have tried selling flowers and replanting and "No Sealing" is my answer. I have tried reloading, going back a few levels and loading, still nothing.

Very frustrating!!!!