I have my Geum in sun and it seems happy. I've got some zonal Geraniums and they grow well with half a day of sun. I've had them in more shade and they still did ok, but the zonal coloration in the foliage became faint and they didn't produce as many blooms.
"...and don't think the garden loses its ecstasy in winter. It's quiet, but the roots are down there riotous." Rumi
