120-140 Days to maturity2-3 Days to sproutCelery seeds per packet: About 5,000Celery seeds per Oz: About 70,000Celery seeds per Lb: About 1,120,000Plant 1/4″-1/2″ deep, in rows 24″-36″ apart, thinning to 9″-12″ apart once the seeds sprout.Celery plants are usually set in the field about 7 inches apart in rows three or three and one-half feet apart. Frequent cultivation and irrigation is necessary, an abundance of fertilizer must be used unless the soil is exceptionally rich. As the plants approach maturity they must be blanched by hilling with earth or with boards or special blanching paper. Late celery should be trenched at the approach of freezing weather. Plants are taken up and set out compactly in a narrow trench, the bottom of which has been moistened just enough for the roots to keep the plants from wilting. Should the plants begin to wilt, water the roots without wetting the stalks or leaves. Keep temperature above freezing point and the stalks will gradually blanch. They may be used during the winter.