Rosemary and Valentine emu turning brittle
I have a Rosemary plant that is in the middle of my north facing backyard that is turning brittle on the west side of the plant only. The east side seems green and fine.
I also have a small valentine emu on the east side of my house that has completely turned brittle. at first the east side of the bush turned brittle (that's the side that gets majority of the sun due to it being right next to the side of my house) then the entire plant turned brittle.
My watering schedule has been 120min m/w/f with those 2 plants on 1gph drip emitters. (I have other tropical and citrus trees on 2gph emitters on the same schedule)
I also have other rosemary and valentine emu in the backyard that seem 100% fine. One of my valentine emu's get's 100% sun all day and its growing like a weed!
Do you think its just a fluke? Maybe I should water them with a tad bit of superthrive?
Thanks for your help!