Plant Vs Zombies 2 : Level up system

I have an idea on where you can level up your plants faster rather than levelling it up 1 level at a time, let's say you can level you sunflower 5-10 levels but you have to tap upgrade 5-10 times in order for it to reach that level, instead of doing that we should have a button to where we can upgrade our plant/s using a single button in which the button will refer to the seed packets of the plant that you have and also the coins that the player has.