Growing Instructions for the greater Burdock.
The germination of the seeds is erratic and is improved by cold stratification. The seeds have a period of dormancy. They can be planted outdoors in the fall or winter for spring germination or they can be cold stratified to simulate winter conditions and to break their dormancy at any time of the year. 1. Put the seeds in a ziplock bag. 3. Put the bag in the refrigerator and leave it there for 4 weeks. 4. Sow the seeds 1/8 of an inch deep. 5. Water the seeds. The roots are large enough to be harvested in 90 days.