Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
An upside-down Volcano Lotus.
Requires no additional graphics.
The pollen spread out faster than usual because of the nature of the pollen sprite that restricts horizontal movement while the pollen move down, but it should still work just fine for the same purposes as usual.
Maybe even a little better?
Actual spread speed can be adjusted in the .asm file.