Even in Texas, I imagine the sun rises and sets further north and travels higher in the sky during the summer. Not sure if the difference is as dramatic as here where the sun rises north of East and sets north of West in the summer, but rises south of East and south of West in the winter, and the sun's path in the sky falls so low in the winter that garden beds that received blazing sunlight practically all day will not see a single ray all winter because the sun won't clear the albeit leafless treetops and roofs of neibors' as well as my own house.
-- my point being the amount of sun on a NORTH facing balcony is likely to be even more limited during winter.
If your apartment only faces north, you may need to be really creative and think outside the box... like lining the balcony with reflective material or salvaged mirrors and/or setting up weather proof lights on timers along the inside wall of the balcony. Or grow your herbs inside of the balcony sliding doors or windows with lights.
I once lived in an apartment where only window that got any sun was a West-facing 18" wide narrow floor to ceiling window. The rest faced North including my Balcony, though it did stick out past the wall of the Utility room (which unfortunately was on the West side of the balcony) by about 12". During the summer, I lined that balcony extension with containers of plants and hung window boxes from the railing, AND put up hooks for hanging baskets.
In that narrow window, I put up glass shelves for all my smaller sun loving houseplants, and the rest lined and hung from the ceiling in the North-facing picture window in the same room.
I had another floor to ceiling narrow window facing East but it was blocked by a huge tree, never-the-less, I lined the corner next to the window with mirror tiles, put up lights and made it a plant corner for plants that didn't need as much light.