The seeds can be sown right away or stored until the following spring in a cool, dry place. No need to refrigerate them (Stratify) however they will need to be scarify (edge of the pod scraped).
Preparing the Wisteria Seeds
The outer shell needs to be scarified, weakened slightly to allow the seed inside to emerge. Rubbing a file or up against cement the edge of the shell to thin the outer shell, The blade of a box cutter could be used to nick the shell. After this process, soak them in hot water for 24 hours to allow the seed to absorb some moisture and further soften the shell.
Nighttime temperatures should be above 55 degrees Fahrenheit and daytime temperatures should be around 75 F. Check the moisture level in the growing mixture every day and mist the soil with water whenever it feels mostly dry on the surface. Don’t let the soil dry out completely, but also don’t keep it dripping wet because the seeds might rot. Wisteria seeds take a month or more to sprout, at which point, move the pots near a bright, sunny window to encourage growth.
Once the wisteria seedlings produce two pairs of mature leaves, it’s time to transplant them.