Before applying broadleaf weed control to newly seeded grass , you must wait until the newly sprouted grass has been mowed three times or wait at least 30 days , whichever time frame is longer. You ve likely heard this said many times before and can come up with a variety of ways that it applies to your life. Autoflower, Feminized, High CBD.  Source: <a href="https://nmjm.wordpress.com/2013/06/27/butterfly-weed-seeds-butterfly-milkweed-seeds/" / rel="nofollow">https://nmjm.wordpress.com/2013/06/27/butterfly-weed-seeds-butterfly-milkweed-seeds/</a>