When growing in a Grobo, the ideal temperature is:


  • Between 21°C (70°F) and 23°C (73°F) in the grow chamber
  • Between 19°C (67°F) and 20°C (69°F) in the bottom reservoir (i.e. water temperature)


For humidity, the target levels for your grow depend on what stage you're at. 


Please be advised that having optimal humidity is NOT required to have a successful grow. These are what humidity levels are beneficial for growing:


  • Seedling - 70-80%
  • Vegetation - 40-60%
  • Flowering - 40-50%
  • Drying - 30-40%


Please do NOT install a humidifier or dehumidifier inside or next to your unit. This may harm the delicate technology inside and will void your warranty (Click HERE, read line four-under Warranty Exclusions). In some cases, it can cause irreparable damage to your unit that will not be covered by warranty if identified by Grobo Support. 


Still have questions? Please see HERE for how to contact us.