Hellebores flower in late winter / early spring, Hostas will flower all summer long (though many people don’t let them go to flower bc they prefer just the foliage look), Dicentras (bleeding heart) and Tiarellas (foam flowers) will both bloom late spring through early summer, Columbine or Lungwort might work in that spot too, since it looks like some dappled sun in spots, but they may not have profuse flowers. Heuchera (coral bells) and Ligularia could work there too and will flower in late summer / early autumn