A few branches of my Rosemary is Yellow is this due to over water or stress , the plant is currently flowering.
How long do rosemary normally flower for ?
It's common with all evergreen plants or shrubs to have some yellowing leaves and to drop them. Just remove them
Rosemary gets woody over time so you might need to replace it after a few years. Easy enough from seed.
They don't flower for long - a couple of weeks perhaps, but it'll depend on they type and what your climate is like etc. Mine rarely do at all as I use the foliage before it gets to that point, and often it isn't warm enough for the plants to get to decent flowering stage either.
I live in the suburbs of london so it can be a warm thing , but i do know i have neglected the soil some what