Johnson grass is not the same as crabgrass. While both are types of grass weeds that can be problematic in lawns and gardens, they have distinct differences in appearance and growth habits.
1. Appearance:
– Johnson grass: This weed is much taller than crabgrass, often growing up to 6 feet in height. Its leaf blades are wide and can reach lengths of up to 2 feet. One distinguishing feature of Johnson grass is the white stripe or line that runs down the middle of each leaf blade.
– Crabgrass: In contrast, crabgrass is generally much shorter, usually reaching a maximum height of around 1 foot. Its leaves are narrower and shorter than those of Johnson grass. Crabgrass typically has a lighter green color compared to other grasses in the lawn.
2. Growth habits:
– Johnson grass: This weed is a perennial grass, meaning it can survive and regrow from the same root system year after year. It spreads through both seeds and underground rhizomes, which can make it difficult to control. Johnson grass is known for growing aggressively and can quickly overtake a lawn or garden if not managed properly.
– Crabgrass: Crabgrass, on the other hand, is an annual grass. It completes its life cycle within a single year and reproduces solely through seeds. Crabgrass seeds can remain dormant in the soil for several years, germinating when conditions are favorable, such as when the soil temperature reaches around 55 to 60 degrees Fahrenheit.
3. Control methods:
– Johnson grass: Controlling Johnson grass can be challenging due to its extensive root system and ability to regenerate from rhizomes. To effectively manage Johnson grass, a combination of cultural, mechanical, and chemical control methods may be necessary. This can include regular mowing, hand-pulling or digging out the roots, and using herbicides specifically labeled for Johnson grass control.
– Crabgrass: Crabgrass control is typically easier compared to Johnson grass, as it is an annual weed that does not have an extensive root system. Preventive measures such as maintaining a healthy lawn with proper fertilization, regular mowing, and adequate watering can help prevent the germination and establishment of crabgrass. Post-emergent herbicides can also be used to control crabgrass if it has already emerged in the lawn.
While both Johnson grass and crabgrass are types of grassy weeds, they have distinct differences in appearance, growth habits, and control methods. Understanding these differences can help in effectively identifying and managing these weeds in lawns and gardens.
