big city name ... and how about a pic of the space.. for better suggestions ...

also.. how much sun.. what hours.. etc ... any soil issues???

and define 'not too tall'

ken

Almost too many to list!! Peonies, lupines, Lamprocapnos/dicentra, amsonia, geums, various hardy geraniums, epimedums, lungwort, brunnera, primulas, poppies.........

agastache honeybee blue literally blooms all summer

walker's low nepeta would be another good choice

Native to where?

^^That and ^^^^^^that. What's your closest city, and how much sun do you get at that time of year and for the rest of the year when greenery may be showing? It's best if we know the winter/summer weather before we make a solid recommendation.

I have a few in mind that do really well in my native Pennsylvania, but wouldn't be so hot in northern Maine or Florida, and sun or shade will matter...

Shoot, always forget that. Closest city is Toronto