This is a glowing review of the Firefly petunia
@geerlingguy Woah, the effect looks so strong! Have you used any of the recommended chelated plant nutrition? Mine is probably still recovering from being repotted and hadn't started glowing noticeably.

@Stephen304 it just started to glow up after a week and one round of dead heading.

Haven't tried fertilizers yet, the glow is mostly in the new buds.

I will try some fertilizer this week and see what happens! It's a pretty petunia by day.