I agree, Sue. Years ago when I added lime in one seedling bed that
had originally been a wooded area, mostly mature oaks, with years of natural
acidic leaf mulch, I noticed some spots of interveinal chlorosis the next
two years. This was before I had a pH meter, and had assumed the soil
to be overly acidic for these plants. Well, we all know about the risks with "assume".
Even though I now use a meter to check pH, which mostly reads slightly acidic, the seedling
beds are ever changing with new seedlings and added composted amendments.
These changes make it rather difficult for making adjustments in spots as the spots are not static.
In the beds containing parent plants used for crossing, and are not subject to so many changes, the spots of interveinal chlorosis occur in the same places each year which indicates possibly soil type involvement and/or a particular plant's natural need for higher pH, just as you
indicated, Sue. The beds are quite long, and the soil type can vary. The pH meter also shows these beds to be slightly acidic.
So, after several years of observation, rather than making adjustments with the pH,
I simply let nature take its course, and the warming soil takes care of the problem.
However, should I see an overall type of problem in beds, that would require diagnosis and
a viable solution such as in the case of rust.
Plants are such amazing things, and daylilies are such a joy, though they at times increase
my googling process.
