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.
Planting time. Onions are temperature sensitive: they require cool weather to produce their tops and warm weather to produce their bulbs. Plant onions sets (small bulblets) 3 to 4 months before the time you want to harvest mature bulbs; plant sets 3 to 4 weeks before you want to harvest green onions.