in my humble opinion... i think they're drowned/ smothered...
if the leave lack water, the brown-ish color will appear from the tip of the leave first
* from my personal experience... (more than 2 rosemary died in my hand = ="")
買返嚟之後有冇換泥?
花店用GE泥 isn't suitable for herbs to grow in ga...
i changed the soil a day or two after i brought them home (let it settel for a day or 2)
and now they're alive and kicking
add water only when the surface soil is dry (truning light brown)
when u add water to it make sure the water leek from the bottom (soil is all wet)
then they'll be alright