Herbs: advice on perinnials in window box pls

[jjm]

Hi everyone and thanks for taking the time to read this. I need some advice please.

I'd like to grow 3 or 4 perinnial herbs together in my window box. I'd like to grow oregano, chives, thyme and rosemary together but it might be a bit of a squeeze so 3 might be better?

My window box is 18" long, 6" wide & 5" deep.

Please see attached picture and many thanks in advance.

 

[Toddz]

If you water and fertilize your plants on a set cycle, you will be fine.