Re: Replanting JIs


On Wed, 14 Aug 1996 LMann76543@aol.com wrote:

> Anybody know the 'optimal' pH for Japanese iris?


Yes, p. 36 in The Japanese Iris says, "In a study by Swearengen pH levels
from 5.5 to 6.5 were quite satisfactory, with the best growth occurring 
at pH 5.8 (Swearengen 1964).Too much calcium, one of the mineral 
nutrients utilized by plants, is harmful (Marschner 1986),.....etc."	

	There is a reference to a garden where Japanese irises were lost
at soil reduced to pH 4.5 and at a still further reduction to 4.0 pH
ALL plants died or were seriously affected (Delmez 1989).

	So, that is why I said my soil is good for JI's at a pH level of
5.7 and low calcium.

	Ellen Gallagher    e_galla@moose.ncia.net   Zone 3 and happy 
			because we are STILL enjoying our Japanese irises
			at very good bloom!
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