We’d like to add some interest to our perennials gardens. What do you recommend that is:
tall semi-shade long blooming perennials
Thank you for contacting the Toronto Master Gardeners.
There is an array of choices we can recommend. Much depends on light conditions (you mentioned Part-shade), soil type and natural moisture in your site. I am also assuming that you are located in Toronto.
As such, you can take a look at the following list of perennials as a starting point. I have selected perennials that are long blooming and > 100cm in height. However, when looking at these at the garden center, check the height for each variety as some will be a bit shorter than others:
Rudbeckia laciniata (Cut leaf Coneflower): 120-210cm
Eupatorium purpureum (Joe-Pye Weed): 200cm
Silphium perfoliatum (Cup plant): 100-250cm – It prefers full sun but can survive part-shade
Ligularia dentata (Ligularia): 100-150cm
Digitalis purpurea (Foxglove): 90-120cm
Matteuccia struthiopteris (Ostrich Fern): 100cm – Although non blooming, it adds interest to the back border
Cimicifuga (also classified as Actea) simplex (Bugbane): 150cm
Aruncus spp (Goatsbeard): 90-100cm
Thalictrum spp (Meadow Rue): 90-150cm
Aconitum spp (Monkshood): 70-110cm
Filipendula purpurea (Meadowsweet): 100cm
Veronicastrum virginicum (Culvert’s root): 90-120cm
Symphyotrichum novae-angliae (New England Aster): 100-150cm
Rodgersia aesculifolia (Rodgersia): 100cm
Echinacea pallida (Pale Purple Coneflower): 100-150cm – It prefers full sun but can survive part-shade
Monarda fistulosa (Bergamot): 100-150cm
Asclepias incarnata (Red Milkweed): 100-120cm – These need very moist conditions as they live in wet habitats. The common Milkweed is shorter and requires full sun.
The above list includes many native plants. This is not a coincidence; our native plants thrive in our climate and have a tendency to grow taller than non-native ones. They are also more adaptable to many soils.
Best of luck and happy gardening!