I stole this idea from Dan Johnson of Denver Botanic Gardens. It works really well, if the thing stuck in the ground stays stuck in the ground.
I know this looks like something out of The Blair Witch Project, which is part of its appeal; just a bunch of Glaucium corniculatum gone to seed, tied with a Twist-Em and then tied to a bamboo pole; I want them in this garden instead of where they are now. The benefit of this method is that the seed can ripen, and the seed capsules open, without draining the energy of the parent plant, a very good plan in weather like this.
For a large amount of seed, or heavy stems, you can make a tripod, and let the bunch of stems swing below it; very effective at Halloween.