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METHODS OF ACCLIMATIZATION

 

METHOD 2. GIVE FINAL PERIOD OF GREATLY REDUCED LIGHT INTENSITY

In this method the plants are grown in a greenhouse at very bright light intensity, often full sun.  The plants grow fast, are short and compact with lighter green leaves.  If sun plants are placed directly indoors or in an interiorscape: 
a) growth stops
b) leaves turn yellow, especially the older leaves, and
c) leaves fall off, especially the older leaves.

So to acclimatize the plants, they are placed in a very heavily shaded greenhouse or a lighted warehouse in order to acclimatize them to low light intensities.

Notice on the graph below that each plant started out with a certain light compensation point.  For example, Dracaena was the highest at about 120 ft-c and Schefflera was the lowest at about 15 ft-c.  Over time in the acclimatization treatment, each plant's light compensation point decreased.  This is showing their rate of acclimatization.  Notice that all the species acclimatized, i.e. even very shade tolerant plants acclimatized to even lower light intensities.    After about 4 to 6 weeks, the light compensation point does not decrease much more, so the light acclimatization process is virtually complete.

 


(From: W.C. Fonteno and E.L. McWilliams
J. Amer. Soc. Hort. Sci. 103(1):52-56, 1976)

Recommendation:
Grow plants at high light intensities.  Acclimatize plants for 4-6 weeks at very low light intensities (about 150-500 ft-c) in a heavily shaded greenhouse or lighted warehouse.