Soilsniffer's wife here. I think the secret is keeping the soil warm. The pot was kept on a heating pad for quite a while, and germination took a long time. Culantro is dirt cheap in Panama at the supermarket, so it can't be THAT hard to grow or else it would not be worth growing to sell. No heating pad necessary at 7 degrees north though...
And I did not say "pronto", I've been asking for culantro for 7-8 years. We did try to grow from seed a few years ago without success. I do not think DH used a heating pad that time.
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