1 When the tongue is black or grey, it indicates extreme Stagnation; if black and dry, that indicates extreme Heat Stagnation; black and wet is an indication of extreme Cold Stagnation. 2  Bright red indicates deficient Yin or Excess Heat. 3  Dark red indicates Excess Heat.
Jupiterimages/Photos.com/Getty Images. Onions planted from seed are used as green onions within 40 to 50 days of planting. They are fully grown in 90 to 130 days, depending on the variety. Onions planted as soon as the soil can be worked in early spring are ready for the table by July.
Overview. Onion is a cool-weather vegetable that does well when planted two weeks before the last frost date in areas with short growing seasons. Long-day onions do well in areas where sunlight lasts 15 to 16 hours per day. Plant short-day onions in the early fall for southern areas with long growing seasons.nion is a cool-weather vegetable that does well when planted two weeks before the last frost date in areas with short growing seasons. Long-day onions do well in areas where sunlight lasts 15 to 16 hours per day.