Sometimes, what you already have works so much better than something you can buy.
This is a foot-long piece of #5 rebar left over from when we built the chicken coop’s foundation. It is an EXCELLENT dibber for planting onions and small lettuce transplants. If I were a true garden geek I would figure out how to put a nice handle on it so I wouldn’t end up with a stigmatum on my palm.
You know what else works well to poke holes in this clay? A nice pointy stick.