I have a weeping cherry in the center of my potager underplanted with herbs...
...but the options are endless. I like this rosemary standard growing in the potager at Cantigny Gardens in Winfield, IL:
I love, love, love herbs in the center of a potager. Herbs arranged in containers looks spectacular:
So do herbs underplanting a birdbath:
A birdbath on its own atop a center material change (crushed granite to pavers):
How about a sundial?
A bean teepee is whimsical and functional:
I always tell clients that the center of a potager is a place to get creative, and show your personality. Garden art, sculptures, native plants to bring in pollinators, bird baths, bird houses, trees, shrubs, tuteurs, even a scarecrow, would all be nice focal points in your potager.
If you want to grow your own vegetables and crave a potager (and you live in the DuPage County, IL area), contact me for a landscape design consultation.