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Prior to planting, soak seeds in warm water overnight to reduce germination time.Celery seeds should always be sowed indoors first for best success rate, 8 to 10 weeks before the average last frost date in your area.For summer gardeners, a late summer direct sowing is possible.Harden off seedlings before transplanting by reducing water slightly, and keeping them outdoors for a couple hours at daytime.Transplant seedlings 10 to 12 inches apart, direct sow seeds ¼ inch deep. This will necessitate to be reduced to 12 inches apart when they get to about six inches high.WATERING Celery requires lots of water. Make sure to provide plenty of water during the entire growing season, especially during the hot and dry weather.SOIL Celery prefers moist, rich, well-composted soil with a pH ranging from 6 to 6.5.SPOT Celery requires full sun to light shade.TEMPERATURE The temperature should stay between 13 and 21ºC [55 and 70ºF] throughout growing period.