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David Austin 'Winchester Cathedral' yellowing
Posted: Mon Jun 30, 2008 10:00 pm
I need a bit of advice concerning the aforementioned rose. It's done quite
well for a couple of years, but looks very chlorotic this summer. It has
been properly fertilized, gets enough sun, no bugs. It bloomed earlier
in the season, but isn't blooming at all now.
It is planted next to a walkway and I suspect the soil might be alkaline from rain run-off. Might a treatment or two of Miracid be called for?
Posted: Mon Jun 30, 2008 11:23 pm
Can you get any help from www.davidaustinroses.com on this variety?
I'm not familiar with Miracid; is it a soil treatment? an iron supplement?
Please write again with more specifics (and maybe a photo, if you have a digital camera).
USDA Zone 9, Sunset Zone 17
Miracid is a soil acidifier and contains chelated iron. It
Posted: Tue Jul 01, 2008 3:15 am
comes in granular form and is mixed with water. I've visited the Austin
site and have found no particular answer for this problem. I've never
had the need to use an acidifier on roses in the past and am interested
in its application for the purpose of balancing the alkalinity that possibly
comes from the walkway.
Posted: Tue Jul 01, 2008 9:55 am
Why not run a soil test first, before you add anything? You may be missing some trace elements in that area that's causing the problem.
I intend to buy a soil test kit tomorrow, however, my query
Posted: Wed Jul 02, 2008 3:14 am
was intended to ascertain whether anyone else had used Miracid on
roses. I use Jack's Professional with cal/mag and other micronutrients,
so I'm not particularly concerned with the nutrient content of the soil.
Often the acidity of the soil around concrete foundations, walkways, etc.
has the soil ph unbalanced by runoff. The soil test is a fine idea.