Rooftop (extensive) Plants

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Achillea millefolium

Achillea millefolium

Common Yarrow

Flat-topped clusters of white flowers Seeds ripen July to September Foliage is mid-green and fine-textured A native plant in most areas of North America Bloom Time: June to August...

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Achillea ptarmica Peter Cottontail

Achillea ptarmica Peter Cottontail

Sneezewort

Low mounding habit Large Ivory-white flowers Lance-shaped, dark green leaves with fine-toothed margins Excellent cut flower, fresh or dried Bloom Time: June-July and sporadically into the fall...

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Achillea ptarmica The Pearl Group The Pearl

Achillea ptarmica The Pearl Group The Pearl

Sneezewort

Quick spreading, rhizomatous perennial Tight, button-like, double, white flowers Lance-shaped, dark green leaves with fine-toothed margins Excellent cut flower, fresh or dried Bloom Time: June-July and sporadically into the fall...

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Acinos alpinus

Acinos alpinus

Alpine Rock Thyme

Pink to purple flowers Low, trailing, dark green foliage Evergreen in mild winters Easy to grow alpine or rock garden plant Drought tolerant, ideal for trough gardens Bloom Time: Early to late summer...

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Allium cernuum

Allium cernuum

Nodding Onion

Best described as a dangling cyme of little florets Flowers are commonly pink and sometimes white Flowers mature into fruit opening to show glossy dark seeds The edible bulb, with a strong flavour, produces grass-like leaves with the flowers Foun...

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Allium giganteum

Allium giganteum

Ornamental Onion

Huge purple balls of tiny star-shaped florets on thick, green stems This allium is not used for culinary purposes Produces grayish-green, strap-like leaves Attracts bees Bloom Time: Late spring to early summer Flower Size: 15 cm...

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Allium giganteum Globemaster

Allium giganteum Globemaster

Ornamental Onion

Huge balls of purple star-shaped florets As the flowers fade, new florets take their place Flowers are borne on stout stems Strap-like, gray-green basal leaves Bloom Time: May to June...

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Allium schoenoprasum

Allium schoenoprasum

Wild Chives

Other common names; chive, chive garlic, rush leeks, Purple-pink balls of star-like flower clusters Both leaves and flowers are edible Used for onion flavouring Bloom Time: Late spring to early summer...

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Allium schoenoprasum Album

Allium schoenoprasum Album

Wild Chives

White balls of star-like flower clusters Grassy-like leaves and flowers are edible Used for onion flavouring Bloom Time: Late spring to early summer...

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Allium schoenoprasum Forescate

Allium schoenoprasum Forescate

Giant-flowered Chives

'Forescate' is taller and more vigorous than the species Deep pink to purple spherical flowers Both the leaves and the flowers are edible Bloom Time: Late spring until summer...

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Allium schoenoprasum Rising Star

Allium schoenoprasum Rising Star

Chives

'Rising Star' is shorter and more vigorous than the species Spherical lavender flowers Fine-textured, gray-green, grass-like foliage Both the leaves and the flowers are edible Bloom Time: Late spring into summer Flower Size: 2.5 cm...

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Allium senescens Blue Eddy

Allium senescens Blue Eddy

Pink Curly Onion

Clumps of blue-gray foliage Foliage grows in a spiral fashion Short stems hold spherical lilac-pink flowers Suitable for rooftop or rock garden plantings Bloom Time: Late summer to early fall Flower Height: 30 cm Foliage Height: 20 cm Flower S...

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Allium triccocum

Allium triccocum

Wild Leek

Reddish stalks Early foliage dies back before blooms appear White to creamy-white flowers Leaves and bulbs smell like onions Bloom Time: June to July...

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Allium tuberosum

Allium tuberosum

Garlic Chives

Clump forming perennial Chive-like, gray-green foliage Tiny, white, star-shaped flowers with brown, striped tepals Flowers appear in loose clusters All parts of the plant have an oniony smell Bloom Time: August to September...

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Allium x Ambassador

Allium x Ambassador

Ornamental Onion

Densely-packed umbels of deep rosy-purple star-shaped florets Strap-like narrow gray-green leaves Will easily naturalize Bloom Time: May to June Late Blooming...

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Allium x Little Sapphire

Allium x Little Sapphire

Ornamental Onion Little Sapphire

Pink-purple, globe-shaped flowers of multiple florets Upright clump of glossy, grey grass-like foliage Compact habit Attracts butterflies and honeybees Bloom Time: July to August...

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Allium x Millenium

Allium x Millenium

Ornamental Onion

Pink-purple, globe-shaped flowers Upright clump of glossy, grass-like foliage Compact habit Attracts butterflies and honeybees Bloom Time: July to August Flower Size: 5 cm...

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Allium x Mount Everest

Allium x Mount Everest

Ornamental Onion

Spherical umbels of white star-shaped blooms Upright ribbed stems Aptly named for its statuesque form Bloom Time: May to June Flower Size: 10 cm...

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Allium x Summer Beauty

Allium x Summer Beauty

Summer Beauty Ornamental Onion

Globose Pale Pink flowers of multiple florets held above Upright clump of glossy grey grass-like basal leaves Compact habit Attracts butterflies and honeybees...

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Alyssum montanum Berggold

Alyssum montanum Berggold

Mountain Gold Alyssum

A popular rock garden plant Rich yellow fragrant flowers Forms a low trailing mound of silvery-gray foliage Semi-evergreen Bloom Time: Spring...

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Alyssum saxatile Compacta

Alyssum saxatile Compacta

Basket of Gold

AKA Aurinia saxatilis 'Compacta' A low-growing perennial with fragrant yellow flowers An attractive ground cover with gray-green foliage Great for rock gardens or as edging plants Attracts butterflies Bloom Time: Spring...

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Ammophila breviligulata

Ammophila breviligulata

American Beach Grass

Long, narrow, soft-textured golden-tan flower spikes Gray-green leaf blades are narrow, with extremely sharp tips This is a great low-maintenance grass for erosion control Bloom Time: July to August...

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Anaphalis margaritacea

Anaphalis margaritacea

Pearly Everlasting

Small white button-like flowers with yellow centres Forms a bushy mound of hairy silver-gray foliage Often found along roadsides and in disturbed areas Food source for many butterflies Bloom Time: July to August...

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