Ideas for bright flowering perennials please.

2oaktrees

I have a large open space at end of the garden which is shaded by 2 large sycamore trees. I need some ideas on bright flowering perennials that will help to make it stand out and brighten up the area. Perennials with white, yellow and pink flowers would be ideal and visible from a distance. 

Any suggestions will be greatly appreciated. Thank you. 

2oaktrees

Here’s a photo of the area before we cleared it off all the rocks, weed, ivy and grass.  We have trimmed the trees after taking this photo, it is brighter but still shaded. 

DimWit

Actaea, hydrangea, rodgersia... You will need to improve the level of moistness in case you want to keep any of these three!

Blue Onion

Verigated pink weigela, gardenia, brunnera, and a whole bunch of white narcissus.