Willinator said:OK I did a pH test on the container with the 'Gruss an Aachen' and the pH tested at 7 which is
absolutely neutral so I don't need to get it much lower if at all. I may try a different rose next
year. I will consider planting it in the Fall.
Repot the rose with new soil and see what happens.
For some reason, some times the dirt in a container just is bad, just the way it is.
PH 7 is too high.
Chlorosis is the yellowing of the plant leaves for the lack of chlorophyll. There are two types of chlorosis. Chlorosis and Interveinal chlorosis.
It will happen because of the deficiency of nitrogen, oxygen, or iron. Generally, nitrogen or oxygen deficiency can be the cause of chlorosis but iron deficiency is the cause of the interveinal chlorosis.
Interverinal chlorosis is more complex than chlorosis and it mostly occurs to the rose bushes. Sounds sad, right? But have a simple solution. Keep reading-
The main reason for the iron deficiency in the plant is high soil pH. You should know, Rose plants can't absorb required iron because of high pH. If the pH will be not high, then it may be the cause of iron deficiency in the soil.
There are also some secondary reason of the interveinal problem such as compact soil, high salt, and manganese and zinc deficiency in the soil
If the leaves of the rose turn yellow and curl but the vein remains green, then it will be caused by iron deficiency.
But if the vein also turns yellow as well as leaves, the chlorosis occurs due to oxygen deficiency or poor drainage facilities.
Want to know the easy way to identify iron deficiency?
Then you should know, Upper leaves or young leaves turn yellow because of iron deficiency and nitrogen behaves the opposite.
Controlling Measures and Prevention
Here I will give you only the treatment of interveinal chlorosis. Because iron can increase the availability of nitrogen. So, If the chlorosis occurs due to the nitrogen deficiency, you don't need to add extra nitrogen.
Let's learn how to fight against interveinal chlorosis-
Rose love slightly acidic soil.
Test the soil pH with a pH meter(our pick: Atree Soil pH Meter). If the pH is high, add some acid-forming fertilizer (sulfur, peat moss, or leaf mold). But if the pH already remain under 6.5
, add some iron amendments such as greensand, cottonseed meal, Iron tone or Ironite.
If you need a quick solution, then forget all. Just apply 1/4 teaspoon of iron chelate or iron sulfate on rose bushes.