Button Mushroom <em>(Agaricus Bisporus)</em> variety 30


  • Colour: smooth white.
  • Size: Big depending on the number of fruiting bodies, that can change with the manipulating conditions.
  • Shape: Domed and thick cap, with a straight cylindrical stalk. Thick velum.

Growing characteristics

  • It needs good quality compost, correctly finished, with a well integrated moisture that should oscillate between 68 and 72%. It should be a selective compost, with plenty of Actinomycetes and humic.
  • Quick growth in the incubation period (12–14 days), as also in the soil covering invasion, and the fruition period.
  • It easily yields a crop.


  • The compost temperature during the INCUBATION should not rise over 29ºC, being the optimal temperature 25/26ºC. At these temperatures the mycelium growth is strong and vigorous, and germination will end in about 12–14 days.
  • It is important to choose a CASING SOIL with a good texture, a great water retention capacity and porous. The covering must be set very damp and uniformly, with a thickness from 3,5 to 4cm. This way, the mycelium that invades the covering will develop thick filaments that will help to transport the nutrients to the fruiting bodies. The quality of this mycelium that invades the covering, will determine the number and size of the mushrooms.
  • During mycelia growth on casing soil, a high air relative humidity and CO2 concentration should be kept, ventilating only to prevent the compost temperature from surpassing 29ºC.
  • PINHEADING induction should be done when the mycelium is uniformly extended through the whole soil.
  • During pinheading the compost temperature should be lowered to 18ºC.
  • In mushrooms for the market, this temperature drop should be slow, gradual, and taking its time.
  • The CO2 concentration during the fructification should not descend below 1.100 ppm, but it depends on the number of fruiting bodies whished.
  • The level of CO2 after that moment should be kept between 1.500 and 2.000 ppm.
  • During PINHEADING, sometimes it will be difficult to keep those CO2 levels. As long as the CO2 level does not exceed 2.200 ppm, there will not be serious damage, but it will cause a lengthening on the stalks. Humidity should stay at 85% and always under 90%.
  • The best temperature for the mushrooms’ growth will be between 16/18ºC although the resistance range is wide.


Button mushrooms excellent for the market.


From September to April.