Empowering your plants with the brand new Power Mints!

Quote: ....Power Mints can only be upgraded while they're featured....

Thanks for the information, just a quick question please if I may, is this just a one time feature or is it likely to be done again sometime in the future? I ask because I am not quite convinced it's effect is that good at low levels, but then I would like to save my hard earn mints for the other mints in the forthcoming weeks.