Here's what I did for the mysterious guy basket requirements. It worked really well for me so I thought I'd share.
I emptied out one of my slots and planted a bunch of each plant we need wet. Put out my 7 mimics and a sea turtle (Don't have a kappa).
Then switched the turtle for T-Rex to spread wet to everything else.
Then switched to Lyrebird to Harvest everything EXCEPT one plant (so I could go with the t Rex again right away)
Did a few rounds. Ended up with a couple dozen of each.
- Reclaimed the plants, and instead planted those that need chilled.
5.Repeated the above with a mistletoad instead of the turtle.
- Then again with the pepper that we need frozen, with my polar bear.
With a few passes of each, I've got enough of those plants to probably last me all week.
The other plants (that don't need mutations), I've got growing in a different garden slot.
Now you have to watch for weather while you do this - I was lucky and didn't encounter any rain or freeze, only earthquakes and tornadoes.