Weed Problems
Weeds are usually the biggest problem homeowners encounter with their lawns other than proper maintenance and watering.
Weeds are really just one type of plant that it has been decided through years of experience, that it would be better if it wasn't included in a spread of what we call turfgrass.
Weeds usually are fast growers, and may have a limited life-cycle. Weeds will often use up limited resources; they may or may not have a deep root system and typically do not handle being trimmed compared to turfgrass.
Weeds fall into 3 categories based on their physiology:
We often get a question similar to this: if weeds are so prevalent, why don't we just grow them instead of grass? Usually, it's because a weed only grows during limited times during the growing season. For example, crabgrass doesn't start to appear in cool season areas until July and early August. If you opted to have a lawn made up of crabgrass, it would remain brown and lifeless from October to July.

Broadleaf Weeds
