The pores or stomata of the epidermis open into substomatal chambers, connecting to air spaces between the spongy layer cells.
Above 85F (29C) the stomata (breathing pores) in leaves close and the tree stops aspirating (breathing), and the exchange of gases and moisture through the leaves is radically lowered.
Washing off the foliage also keeps dust and pollutants from clogging stomata or breathing holes in the plant's leaves.
- Sure it's raining, but is it enough to get good flow-through? Better safe than sorry; water anyway. Been raining all week?
photosynthetic processes, by clogging the pores or stomata, located on the
bottom of leaves, which bonsai trees use for this vital air exchange, through
dust and debris accumulation.
What Else Is Air Circulation Responsible For?
Transpiration - Transpiration is the process of water loss from trees and plants through stomata. Transpiration occurs when stomata open in a humid surrounding and close when it is dry.
Across the surface of a leaf (the Cuticle) are small pores called stomata which during daylight hours absorb the carbon dioxide necessary for the process of photosynthesis.
and some say to wait until just before sunset while the stomata are most active. I have had no problems whatsoever foliar feeding as I stated above with the hot and dry conditions in my area, and doing it about two hours before sunset.
Many cuttings form in a ring around the bottom of the cut (Chaenomeles), others form at the lenticels (openings in the stem similar to stomata on leaves), and yet others form at the leaf scars (roses).
4. Transpiration: The process by which a plant loses water, primarily through pores (stomata) in the foliage. 90% of the water that enters the plant escapes in transpiration. The other 10% is used in chemical reactions and in plant tissues.
The rate of transpiration is regulated by stomata little window like cells which closes and opens in response to temperature and carbon build up in the leaf.
All parts of a plant absorb water to some degree; 35% of the water intake for a plant doesn't involve the root system at all. Washing off the foliage also keeps dust and pollutants from clogging stomata or breathing holes in the plant's leaves.
The photosynthesis process requires an unrestricted exchange of fresh air and stagnate environmental conditions could compromise your bonsai's ability to continue its photosynthetic processes, by clogging the pores or stomata, ...
 See also: Plant, Species, Bonsai, Tree, Light
  
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