The Prehistoric Fern Module is a one-slot Rank 4 Module used to grow Green LEGO Bricks. It requires two Yellow LEGO Bricks and two Blue LEGO Bricks to set up, and it grows one Green LEGO Brick a day, plus one for every five clicks. It has a harvest limit of fifteen Green Bricks. Generally speaking, the Prehestoric Fern Module is not recommended for growing Green Bricks, as there is a set up fee in addition to slow growth. However, assuming the user never receives Green Bricks from other resources (e.g. the Pet Panther Module or the Rocket Game Module) or Dino Scales, this Module is initially the only way to obtain them. After the user acquires a sufficient sum of Green Bricks, the Dino Bone Gallery Module is generally a more efficient choice.