Onion Grass or Guildford Grass is a big problem in Perth lawns and gardens. It is a winter grower but can grow all year in shaded well watered garden beds. It is very hard to manually control as it has a bulb which unless dug completely out will multiply. It's impossible to pull out of a lawn. WEED BUSTERS can successfully rid your lawn or garden of this pest. We use a mix of herbicides which slowly kill the bulb over a 4 - 6 week period without damaging your lawn.