WEED SEEDS PRODUCED per PLANT
and NUMBER of YEARS VIABLE
Many of these are in our Garden Plots
Bindweed 40 yrs Long-lived perennial with deep root system – never let it seed!
Curly dock Rumex crispus 29,500 70 yrs
Foxtail 20 yrs
Canada Thistle 21 yrs
Dandelions 100-200 seeds/head 6 yrs Germinates immediately after reaching maturity...it has no after-ripening requirements. Seed keeps in a ziplock bag in a refrigerator for 2 years with extremely high germination.
Evening Primrose 70 yrs
Galinsoga ciliata 7,500 10 yrs + in soil
Lambsquarters Chenopodum album 72,450 7% viable after 38 yrs
Mullein Verbascum thapsus 223,200, 70 yrs
Nutsedge 100 – 2,000
Pigweed (redroot) 117,400 10-40 yrs
Plantain Plantago major 36,000 40 yrs
Purslane Portulaca oleracea 52,300 40 yrs
Redroot pigweed Amaranthus spp 117,400 3 yrs Unknown viability after 38 yrs
Shepherd's purse Capselia bursa-pastoris 38,500 16 yrs
Ragweed (Common) 3,380 39 yrs
HOW to GROW WEEDS:
- Seed germination occurs at or very near the soil surface.
- Light increases germination.
- The seed germinates when soil is moist and soil temperature is at least 50°F; however, germination is more rapid when the soil temperatures are closer to 77°F.
- Germination occurs throughout the growing season.