Was it a good green up to this point? Yellowing = what, specifically? All leaves becoming entirely yellowish, or something else?

The existing research does not justify foliar fertilization of landscape plants as a general method of
mineral nutrition. It can be useful for diagnosing deficiencies; for instance, spraying leaves with iron
chelate can help determine if interveinal chlorosis is from iron deficiency. It would obviously have
benefit for those landowners with landscape fruit trees that perpetually have flower or fruit disorders
associated with micronutrient deficiencies. Applying fertilizers to leaves (or the soil) without regard to
actual mineral needs wastes time and money, can injure plant roots and soil organisms, and contributes to
the increasing problem of environmental pollution

https://s3.wp.wsu.edu/uploads/sites/403/2015/03/foliar-feeding.pdf

Please see the attached photos. If it is a poor drainage issue; are there ways to incorporate soil amendments to correct the problem without digging up the bush?

z5 is half the US.. care to be a bit more specific ...

stop feeding it now ... you want it slowing down for fall/winter.. not juiced up ...

when was it planted.. how did you plant it.. how did you water.. why do you keep fertg it??? .. looking back into the pix.. i see a lot of well grown plants ... which i would presume are thriving with no fert from anyone ... this is a plant.. not a child.. it doesnt need food regularly .. and NEVER at planting ...

in my z5.. i am not concerned about leaves turning color in sept.. thats is what deciduous plants do i fall ... and sometimes .. either on new transplants.. or due to some summer weather phenom ... they do it early ... which version of a horrible summer did you have ... multiple droughts like me.. or the inundating rains of other areas???

ken

ps: id be wondering more about the tree above it.. which looks like a lot of work was done around it.. including being buried by large rocks .. was that a recent project????

The location is in Southern coastal Maine about one mile from the ocean in a small seasonal cottage community. The community is open from May 1st to October 31st. The rocks you see are what we were left with by the developer. It was a wet spring, but a dry summer. The weather people do report, we could use the rain. It was a very dry; drought conditions in 2016. Other Rose of Sharon bushes on the property, although larger and a couple of years older don't seem to have the yellowing leaves.

Thanks

If you are wondering about soil moisture, dig a hole next to it and look at the soil. If there is any time of the year that the planting site floods I would dig it up when it is not in leaf and put it in a better spot, with adequate drainage. Otherwise - going without a soil test, which would really be best - it looks like it needs more nitrogen to me. These often need to be fertilized in my area also. If you looked at the article I linked to above liquid products are not the way to go when maintaining landscape plantings, with granular formulations being preferred.