There are many different cell types and sub-types involved in the immune system. Some of the main types include: Lymphocytes: are white cells which circulate between blood and lymph. They play an important role in fighting infection.
After about 50 to 60 days, beets are ready to harvest. Not only can the roots be dug up and chopped to add flavor to a meal, but the greens of the beets can be harvested periodically and put in salads. Given how well these beets fare in different weather conditions, they can be grown several times in a summer.
Planting and spacing. Beets are grown from seed clusters about the size of a small pea. Each cluster contains several seeds. Sow seed clusters 1 inch deep and 1 inch part; thin successful seedlings to 3 inches apart when seedling are 3 inches tall.Space rows 12 to 18 inches apart.ow beets in the garden 2 to 3 weeks before the last average frost date in spring. Continue succession plantings every 3 weeks until temperatures reach 80Â°F. Beets can again be planted in late summer or early autumn 6 to 8 weeks before the first average frost in autumn.