The seed should be planted directly in the ground outside about 2 weeks after all danger of frost has passed. Here in Southcentral Wisconsin it means that I plant outside sometime between May 20 and 30. The basic rule is to keep plants separated from each other by about 15 inches. I plant in beds that are four feet wide by about twenty feet long. I make three rows, and plant seeds about 18 inches apart within each row.
Okra seeds are relatively large and easy to handle.
They also germinate well if the soil is warm enough. I plant the seeds about half an inch deep, about three seeds at each spot. I thin them to only one plant every 18 inches. Okra needs warm weather to grow well. This means that in northern climates you may not have much of a crop some years.