Hetalia Leaves

I know it's taken me like 87 episodes to ask this but... What's with the leaves? Like I'm seriously worried about what exactly are in these bushes that the Hetalia boys keep crawlin' around in that the make the leaves so sticky?!?!?!?


NOTE: I do not claim any ownership to this the anime series Hetalia(R), nor am I affiliated with the companies of Hulu or Funimation... I'm just an obsessed fan who probably should be spending her time more wisely.