I advise you don’t do it:
270 energy for 1.37 Basils (not even half way to the second).
Not worth the time spent on creating it by the developers, not worth the energy or time spent on farming it by the players. I haven’t done the Maths but I’m pretty confident that 270 energy spent on the last world map roadmap would have gotten me significantly more xp value in survivors that I could train into 2 stars. Spending energy on this is a nerf on your normal survivor farming.
Admittedly 120 of that energy was on stages that don’t drop anything (yes you have to use 1 and a third cans on nothing before the flowers even start dropping), so that if you are farming it a lot more, the value might get slightly better, but I still can’t see it overtaking basic 2star farming.
It’s a Scopely energy trap not an event.