Humidity management

• Relative humidity (RH) measures how much water is dissolved in the air at a specific temperature.
• It is the ratio of how much moisture is actually in the air at a given temperature compared to the maximum amount possible without condensation.
• RH is expressed as a percentage. The ideal range of RH for most greenhouse plants is 45-85%. Greenhouse peppers thrive at 75%RH; African orchids prefer 40-60% RH. For roses, the ideal RH is 80%.l
• If the RH is above 85%, water may condense on plants and increase the risk of fungal pathogens and diseases.(However, cut tulips and cut daffodils should be stored at over 90% RH.) If the RH is below 45%, stunts plant growth