In GAG 2, the sprinkler combo most people use for big plants is the Super Sprinkler setup, because it boosts nearby plant growth by 5x and gives a size luck bonus of 100 for two minutes.

What to use

  • Super Sprinkler : the main one for large-plant growth boosts.
  • Watering Cans : useful alongside sprinklers to further improve plant weight and size.
  • Plant-boosting pets : these can help push growth and size even more.

Simple combo

  1. Place the Super Sprinkler near the plants you want to bulk up.
  1. Use Watering Cans on them while the sprinkler effect is active.
  1. Stack any growth-friendly pets you have for extra boosts.

Quick note

If you meant a specific “sprinkler recipe” or a named combo from a forum post, I can narrow it down further. Based on the sources available, though, the clearest answer is that Super Sprinkler + watering support + boost pets is the big-plant combo.