Native Plants - C

Caltha palustris
Marsh Marigold
Buttercup family - Ranunculaceae

A compact bushy plant with kidney-shaped smooth leaves. The brilliant yellow flowers are borne on long stems, most often in groups of three.
Found alongside slow streams, roadside ditches, wet depressions in woods, and shallow ponds.

Bloom: May - June
Height: 30 - 60 cm ( 12 - 24 inches)
Sun or shade. Shallow standing water, or wet clay soil.
Campanula rotundifolia
Harebells
Harebell family - Campanulaceae

A graceful but tough plant that nothing seems to bother. Flower colour can range from pale to deep blue. Foliage - narrow leaves giving a fine ,lacy appearance. Self-seeds.

Bloom time: June to Sept.
Ht: 20-45cm (8-18”)
Sun or semi-shade. Any well-drained to dry soil.

Direct seed in fall or cold moist stratify for 6 weeks before sowing in spring.
Canadanthus modestus =Aster modestus
Large Northern Aster
Aster family - Asteraceae/Compositae


Wetland aster that will adapt to regular garden conditions. Will slowly spread into a large patch. Doesn’t self-seed.

Bloom time: July - August
Ht: 60cm (2 ft)
Sun or semi-shade.

Aster seeds have a low germination rate, so plant lots. You can always thin them out later. Sow the seeds directly into the garden in late fall and they will germinate in the spring. These seeds need a cold, moist stratification before they will germinate.
Cerastium arvense
Mouse-ear Chickweed
Pink family - Caryophyllaceae

A low mat-forming groundcover with narrow leaves and masses of small white flowers
in spring and early summer. It is a tough and adaptable plant that grows in meadows in the wild.

Bloom time: May - July
Height: 10 - 20 cm (4 - 8")
Sun or semi-shade, average soil.
Chamerion angustifolium = Epilobium angustifolium
Fireweed
Evening Primrose family - Onagraceae

Vigorous perennial; spreads rapidly via underground runners.
Rose-pink flower spikes. Cut off spent flowers to prevent self-seeding.
Attracts bees.

Bloom time: Mid – late summer
Hight: to 1.5m (5’)
Sun to semi-shade; average soil.

Direct seed in spring or fall. Cover lightly.

Cirsium flodmanii
Flodman's Thistle
Aster family - Asteraceae/Compositae

Food source for bees, butterflies and birds. Spreads but is not aggressive.
Quite rare in Edmonton. Do not confuse with Canada Thistle (C. arvense) – an introduced weed. Flodman's Thistle has solitary flowers - one per stem, whereas Canada Thistle has many smaller flowers.

Bloom time: July
Ht: 60-90cm (24-36”)
Full sun; well-drained soil.

Direct seed in late fall or cold moist stratify for up to 8 weeks.
Clematis occidentalis
Purple Virgin's-bower
Buttercup family - Ranunculaceae

A semi-woody vine that trails on the ground or climbs trees. Very delicate-looking beautiful flowers in shades of blue and purple. The "petals" are actually sepals. The leaves are compound - each one divided into 3. They are so separate that they look like 3 leaves instead of 1.

Bloom time: May - July
Height; up to 2 m
Semi-shade, and keep the roots shaded with mulch.
Corydalis sempervirens
Pink Corydalis
Fumitory family - Fumariaceae

Short-lived perennial or biennial but self-seeds. Tubular flowers 1.5cm long in a stunning colour combination of pink and yellow. Great for rock gardens or open woodlands.

Bloom time: May - July
Ht: 20-60cm (8 - 24”)
Sun or semi-shade. Likes damp soil.

Direct seed in spring or fall. Cover lightly.