Rose Gertrude Jekyll new growth discolouration - chlorosis?
I’m thrilled to see lots of new growth and buds on GJ, since up until now it’s rebloom after the first flush has been pretty non-existant. The new shoots start pinky red, as normal, then turn a weird tan colour. I have changed it’s fertilising regime this year, since learning that organic ferts are not effective in pots. I have been using a weak inorganic, balanced fert one week followed by a weak tomato feed the next. I don’t think I have been overdoing it, but maybe I have pushed her too fast - could this somehow have locked out iron? If it were dark green leaves turning yellow with green veins (veins are actually red tho the pics show them as green) I would say yes, but the weird colouration has thrown me - any ideas? Oh and a huge invasion of sawfly larvae this year can’t be helping!
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.