For dispersing very small seeds, add sand and put into an empty spice shaker. The sand will help you to plant more evenly and see where the seeds have been planted.
I was just putting some ornamental Kale seeds into an empty spice jar/shaker this morning and thinking that would make a good tip. I hadn't thought about adding sand but that makes it a great idea. Very useful when broadcasting seeds.
I'm going to give that a try for sowing my sempervivum seed. The sand would also be beneficial to the semp seedlings.
Thank you Cinda for such a useful Tip.