Yes, there is a surprise! I just completed my collection (also needing the rare Jet Moth...)
I already got that _bug_ in another game, but wasn't sure what plant attracted it to my greenhouse, and was catching many other bugs while waiting for it in the game where it was the only one needed.
The difference this time was that I just bought six seeds from the supply store and they matured overnight.
They were:
- Viola Weeper
- Painted Scandens
- Nox Rare Oak
- Rosaceae Grass *
- Venomous Lemonbush *
- Fragrant Fern
* These two were plants that I know I had in the other game, but don't remember if they were in my greenhouse at the time or not.
It's possible that one of these plants (or flowers or foliage) happened to attract this _bug_, or it could have been a coincidence.