I was able to open the jugs for my calendula, foxglove, chinese houses, shungiku, zinnas and corn cockles. I was afraid to put them in the ground yet, as we have some pretty cold temps predicted this week. We're still 2 weeks away from our last frost date here.
I really wish everything here grew as well as my weeds did. Our harsh winter killed a lot of things, but apparently NONE of the weeds.