It should be uprooted and removed wherever found outside its native range.
These estimates for how long Old man's beard takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average days | Min days | Max days (0)
Average days | Min days | Max days (0)
Average days | Min days | Max days (0)
The many fruits formed in each inflorescence have long silky appendages which, seen together, give the characteristic appearance of Old Man’s beard.
Evergreen clematis, Old man's beard, Traveller's joy, Virgin's bower, Wild clematis
Clematis vitalba L.
1 “King County Noxious Weed list ":http://www.kingcounty.gov/environment/animalsAndPlants/noxious-weeds/weed-identification/old-mans-beard.aspx