Magness et al. As a condiment, the seeds of celery are used either as the whole seeds or ground and mixed with salt in celery salt. For seed production, celery plants are exposed to cold, mainly by over wintering in mild climates.
Seeds are numerous in compound umbels.
The small seeds are flattened and broader than long. Harvest, by pulling the plants, allowing them to dry, then threshing, is in late summer of the second growing season. About 30 acres, mostly for planting.