after the rains go out and grab them by the main stems and give a good shake, it will clean away some of the dust, and protect against PM damage.
If you use something like this: (glycerin) 1-2 tbsp per gallon, it will impart better water dynamics, protect against PM, heat/cold tolerance, and impart a fresh clean feel on the leaves that will help lower water activity. Glycerin is a non (GMO) product found in many plants for regulating this exact process. 100% natural.
Water activity (
aw) is the
partial vapor pressure of water in a solution divided by the standard state partial
vapor pressure of water.
Food designers use water activity to formulate
shelf-stable food. Water activity is related to
water content in a
non-linear relationship known as a
moisture sorption isotherm curve. These isotherms are substance- and temperature-specific. Isotherms can be used to help predict product stability over time in different storage conditions.
aka... it's a portable (chemical) dehumidifier attached to the surface of your outside plants...
Definition of aw:
View attachment 1167402 where
p is the partial water vapor pressure in equilibrium with the solution, and
p*is the partial vapor pressure of pure water at the same temperature.
View attachment 1167403 where w is the
activity coefficient of water and
xw is the mole fraction of water in the aqueous fraction.
Relationship to
relative humidity: The relative humidity (RH) of air in equilibrium with a sample is also called the Equilibrium Relative Humidity (ERH).
View attachment 1167404
Estimated mold-free shelf life (MFSL) in days at 21° C:
View attachment 1167405
View attachment 1167386