When the plant has a problem transpiring, the serations on the leaves begin to curl, independent of the rest of the leaf body, that's how you spot it (diagnose) The quick resolve would be to adjust your humidity but whether or not the plant is transpiring well depends on something that's more of a group of conditions that all need to line up.
For example, how well the pores of your skin move the water coming through them from sweating can be affected by whether or not you have a 20mph fan blowing on you,...lots of environmental things effect the plant as a whole to cause an issue like this.
Read up below on exactly what it is and then troubleshoot your room. Come back with what you came up with and I'll see if that sounds about right.
Transpiration
Transpiration is the evaporation of water from aerial parts ofplants, especially from leaves but also from stems andflowers. Leaf surfaces are dotted with openings which are collectively called stomata, and in most plants they are more numerous on the undersides of the foliage. The stomata are bordered by guard cells (together known as stomatal complex) that open and close the pore.[SUP]
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Transpiration occurs through the stomatal apertures, and can be thought of as a necessary "cost" associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants, changes osmotic pressure of cells, and enables mass flow ofmineral nutrients and water from roots to shoots.
Mass flow of liquid water from the roots to the leaves is driven in part by capillary action, but primarily driven by water potential differences. In taller plants and trees, the force of gravity can only be overcome by the decrease in hydrostatic (water) pressure in the upper parts of the plants due to the diffusion of water out of stomata into the atmosphere. Water is absorbed at the roots by osmosis, and any dissolved mineral nutrients travel with it through the xylem.
Plants regulate the rate of transpiration by the degree of stomatal opening. The rate of transpiration is also influenced by the evaporative demand of the atmosphere surrounding the leaf such as humidity, temperature, wind and incident sunlight. Soil water supply and soil temperature can influence stomatal opening, and thus transpiration rate. The amount of water lost by a plant also depends on its size and the amount of water absorbed at the roots. Stomatic transpiration accounts for most of the water loss by a plant, but some direct evaporation also takes place through the cuticle of the leaves and young stems. Transpiration serves to evaporatively cool plants as the escaping water vapor carries away heat energy.
Stretch
Stretch is caused by many variables but the
2 biggest ones are
- light source too far from plant
- daytime and night time temps have large gap. You want these 2 numbers as close as possible to limit stretch.
