Common chickweed stats and preferences
Life cycle: Winter annual. Common chickweed emerges in late summer (some emergence early in the spring), becomes dormant over the winter, sets seed in the spring/early summer and dies. Can flower within a month and set seed within 2 to 3 months.
Emergence: Common chickweed emerges primarily in the fall. Optimal germination temperatures are 53 to 68 degrees F.
Most seedlings emerge from soil depths of less than 1 inch with a maximum emergence depth of 2 inches.
Seed Production Average: Common chickweed seed production ranges from 750 to 30,400 seeds per plant, with an average of 25,000 seed per plant.
Dispersal Mechanisms: None.
Longevity: Common chickweed seed is moderately persistent because it takes 3 years for the seed bank to be reduced by 50% and about 18 years to deplete the seedbank by 99%. In two studies, 5 an6 percent of the seeds remained viable after 10 years.
Dormancy: Common chickweed has a short after ripening of the seed; accounting for little seed dormancy. Bright daylight reduces germination.
Competitiveness: Common chickweed is fairly competitive with small grains heavy infestations can cause a 66-80% yield loss in barley.
Preferred Soil/Field Conditions: This weed likes high fertility soils and thrives in moist soils rich in nitrogen. Common chickweed is an efficient nitrogen scavenger. If leftover nitrogen is available, there will be more chickweed growth in the fall. This weed prefers neutral soils and dislikes acidic soil conditions.
Predation: Ground beetles (carabids) eat common chickweed seed that is lying on the soil surface.
Tillage: Common chickweed is controlled by tillage, particularly in the fall.
Crop rotation: Common chickweed is typically a problem in small grains, alfalfa, and no-tillage systems. Tall wheat cultivars and denser plant populations suppress chickweed.
Planting date: Tilling in the fall prior to planting wheat will give wheat a head start on common chickweed. In no-till systems control chickweed prior to planting.
Chemical application timing and effectiveness: In no-till production common chickweed is easily controlled in fall and early spring when plants are small. It becomes more difficult to control under cool conditions and when plants become larger and form a dense vegetative mat (size and coverage issues).