Trimming down Rosemary bush question

Question

I have very large Rosemary bushes and would like to trim down their size by at least 50%. I have noticed that the branches deeper into the bush appear brown and dead. If I were to cut to such a degree will it kill the bush or would it grown green again with time?
Thank you

Answer 1

Rosemary is tougher than other woody herbs, so you can hard prune it and it will come back looking better than ever. However, it is best to wait till winter for drastic pruning. You can cut 1/3 right now if you can't wait; then another 1/3 in late winter.

Here's how:
https://www.gardeningknowhow.com/edible/herbs/rosemary/rejuvenation-of-rosemary.htm

https://www.gardeningknowhow.com/edible/herbs/rosemary/pruning-rosemary.htm