In Texas, I plant directly in ground when the soil gets to 70F. I have read that you can start transplants indoors. The shorter DTM varieties like Annie Oakley (50 DTM) or Burgundy (55 DTM) might do better in zone 4. Okra grows best in hot climates. When there are cool nights, okra slows growth - it basically stops growing. If I were growing in zone 4, I would grow okra in a green/hot house of some sort.
Prettier flowers? I've never seen an ugly okra flower.
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