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.
Onions are categorized according to day length; how much daylight there is when onions stop forming tops, or new green leaves and start making bulbs. SHORT DAY ONIONS: Begin forming bulbs when the day length is 10 to 12 hours. (Tend to do better in the south and west.) 'Granex' - Large, globe-shaped, sweet onions sometimes called the Vidalia onion.