Green Roof Perennial Plants

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Hosta

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Hosta

Hemerocallis

Sedum

Heuchera

Phlox

Whitehall

Echinacea

Iris

Helleborus

Dianthus

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Salvia

Liriope

Monarda

Clematis

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Delphinium

Hedera

Paeonia

Delosperma

Gaillardia

Lantana

Papaver

Sempervivum

Digitalis

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Heucherella

Kniphofia

Nepeta

Campanula

Miscanthus

Panicum

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Athyrium

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Perovskia

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Lupinus

Ophiopogon

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Anemone

LAGERSTROEMIA

Penstemon

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Lamium

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Epimedium

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Heliopsis

Lobelia

Pachysandra

Polemonium

Amsonia

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Gypsophila

Ligularia

Scabiosa

Stachys

Tiarella

Viola

Artemisia

Aruncus

Dryopteris

Hakonechloa

Lysimachia

Mazus

Schizachyrium

Tricyrtis

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Green Roof

Green roofs are not necessarily roof gardens; many are not designed to take foot traffic. Green roofs are tools for dealing with stormwater runoff and reducing urban heat islands. Other industry claims include their ability to reduce energy use by insulating buildings from extreme temperatures.

Major benefits include:

storm water retention,
provides insulation,
provides cooling and reduces urban heat,
cleans the air,
saves energy,
sound absorption,
food production,
can provide a habitat and stopping off place for birds and insects.

We are not green roofs experts, we just grow the plants. Green roof’s plants attributes should be low maintenance, normally require minimal irrigation, have quick growth and ease of replacement. Groundcover plants could cover large areas, thrive on green roofs whilst limiting the spread and germination of weeds.

Sedum groundcover cultivars are herbaceous and deciduous plants with beautiful colors. They can grow in any soil type and tolerate a few hours of shade.

Sempervivum are succulent perennial plants with about 40 species, commonly known as “houseleek” or “hens and chicks”. Plants can live a long time and do not require special care. Sempervivum grows well in cold areas with full sun exposition.

Carex or sedge varieties can grow in various soils, climates, and conditions. Selecting the correct varieties provides stand outs without much maintenance.

Delosperma cooperi is a perennial groundcover with a range of inflorescence flower colors. It is a full-sun plant, that can tolerate a few hours of shade.

Thymus is a small evergreen groundcover with gray-green, aromatic leaves and pink-purple flowers in early summer.

Next best recommendations:

Allium, Andropogon gerardii, Armeria, Asclepias, Erigeron, Festuca, Helictotrichon sempervirens, Penstemon, Sisyrinchium, Sporobolus heterolepis

Sedum

Sedum 'Night Light' PPAF (25) BR Plants

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Sedum

Sedum 'Popstar' PP31228 (25) BR Plants

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Sedum

Sedum 'Pride and Joy' PP32530 (25) BR Plants

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Sedum

Sedum 'Pure Joy' PP24194 (25) BR Plants

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Sedum

Sedum 'Tiramisu' PP33781 (25) BR Plants

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Sedum

Sedum 'Yellow Brick Road' PP32158 (25) BR Plants

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Sedum

Sedum dasyphyllum 'Major' (10)ct Flat

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Sedum

Sedum rupestre 'Angelina' (10)ct Flat

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Sedum

Sedum rupestre 'Blue Spruce' (10)ct Flat

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Sedum

Sedum rupestre 'Lemon Ball' (10)ct Flat

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Sedum

Sedum sieboldii (25) BR Plants

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Sedum

Sedum spurium 'John Creech' (10)ct Flat

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Sedum

Sedum 'Night Light' PPAF (25) BR Plants

Sedum 'Night Light' PPAF (25) (25) Bare Root PlantsCommon Name: Autumn Stonecrop A beautifully contrasting Sedum that will set your late summer landscape aglow! 'Night Light' produces deep olive green leaves on dark purples stems that hold clusters...

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Sedum

Sedum 'Popstar' PP31228 (25) BR Plants

Sedum 'Popstar' PP31228 CPBR6264 (25) Bare Root PlantsROCK 'N ROUND® CollectionCommon Name: Stonecrop This low maintenance, compact Stonecrop will be the star of your late summer garden. In the summer, blue-green foliage appears on grey-purple stems...

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Sedum

Sedum 'Pride and Joy' PP32530 (25) BR Plants

Sedum 'Pride and Joy' PP32530 CPBRAF (25) Bare Root PlantsROCK 'N ROUND® CollectionCommon Name: Stonecrop 'Pure Joy' has become a garden staple for the late summer/early fall garden. Now joining the light pink 'Pure Joy' and the white-flowering sport...

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Sedum

Sedum 'Pure Joy' PP24194 (25) BR Plants

Sedum 'Pure Joy' PP24194 CPBR5340 (25) Bare Root PlantsROCK 'N ROUND® CollectionCommon Name: Stonecrop It was truly a joy to watch this plant progress through the seasons here in our trials. In the spring, very small, sharply serrated leaves...

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Sedum

Sedum 'Tiramisu' PP33781 (25) BR Plants

Sedum 'Tiramisu' PP33781 CPBRAF (25) Bare Root PlantsROCK 'N ROUND® CollectionCommon Name: Stonecrop This upright Sedum displays many colors over the growing season, much like the colors of the decadent dessert. Through most of the summer, bronze...

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Sedum

Sedum 'Yellow Brick Road' PP32158 (25) BR Plants

Sedum 'Yellow Brick Road' PP32158 CPBRAF (25) Bare Root PlantsROCK 'N LOW® CollectionCommon Name: Stonecrop Looking for a beautiful groundcover? 'Yellow Brick Road' is your answer! This perennial will cover its dark green leaves and red stems with...

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Sedum

Sedum dasyphyllum 'Major' (10)ct Flat

Sedum dasyphyllum 'Major' Common Name: Corsican stonecrop Zones 5 to 9. Full sun. Plants reach 2 to 4 inches tall and 8 to 12 inches wide; creeping groundcover habit; semi-evergreen. Growth rate: fast. 'Major' forms a low carpet of tightly clustered,...

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Sedum

Sedum rupestre 'Angelina' (10)ct Flat

Sedum rupestre Angelina Stonecrop Zones 3 to 11. Prefers full sun and well-drained soil.Mature height 3 to 5 inches, spread 15 to 18 inches. Vigorous, low creeping, evergreen, mat-forming, groundcover with needle-shaped, golden yellow foliage that...

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Sedum

Sedum rupestre 'Blue Spruce' (10)ct Flat

Sedum rupestre 'Blue Spruce' aka Sedum reflexum 'Blue Spruce' Zones 3 to 9; Sun. Spreading stonecrop that typically grows to 4 to 6 inches height. Blue-green needle-like semi-evergreen foliage. Bright yellow blooms cover the plants in late spring to...

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Sedum

Sedum rupestre 'Lemon Ball' (10)ct Flat

Sedum rupestre 'Lemon Ball' Common Name: 'Lemon Coral' stonecrop Zones 7 to 11, hardy to 5F. Full sun. Plants reach 3 to 6 inches tall and 12 inches wide; creeping groundcover habit; semi-evergreen. Growth rate: moderate. Needle-like yellow foliage...

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Sedum

Sedum sieboldii (25) BR Plants

Sedum sieboldii (25) Bare Root Plants Common name: Stonecrop-October Daphne. Often described as having the most beautiful foliage and form of all sedums, this adorable little plant looks great all summer long and then really comes into its own in...

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Sedum

Sedum spurium 'John Creech' (10)ct Flat

Sedum spurium John Creech Stonecrop Zones 3 to 9; Sun. Vigorous, spreading stonecrop that typically grows to 2 inches height. Semi-evergreen has small, scalloped, green leaves with serrated edges. Pink flowers appear above the foliage in fall. Quickly...

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What are the benefits of planting Green Roof Perennial Plants?

Planting Green Roof Perennial Plants offers a whole host of benefits, both for the environment and for the building itself. Here are some key advantages:

Environmental benefits:

Improved air and water quality: Green roofs absorb pollutants from the air and filter rainwater, releasing cleaner water back into the environment.
Reduced stormwater runoff: Plants absorb and store rainwater, mitigating the impact of heavy rain events and reducing strain on sewer systems.
Cooler urban temperatures: Green roofs can reduce urban heat island effects by reflecting sunlight and absorbing heat, making cities more comfortable and lowering energy consumption.
Habitat creation: Green roofs provide valuable habitat for pollinators like bees and butterflies, promoting biodiversity in urban areas.
Carbon sequestration: Plants absorb and store carbon dioxide, a greenhouse gas, helping to combat climate change.

Building benefits:

Extended roof life: Green roofs protect the underlying roof membrane from UV rays and temperature extremes, leading to a longer lifespan.
Improved energy efficiency: Green roofs can insulate buildings, reducing heating and cooling costs.
Noise reduction: Green roofs can absorb sound waves, creating a quieter environment inside and outside the building.
Aesthetics: Green roofs add beauty and greenery to urban landscapes, improving the visual appeal of buildings and creating a more pleasant environment.

Specific benefits of Green Roof Perennial Plants:

Low maintenance: Unlike annuals, perennials come back year after year, requiring less planting and upkeep.
Hardiness: Perennials are typically more resilient than annuals, better equipped to handle harsh rooftop conditions like wind and drought.
Deeper root systems: Deeper roots improve soil health, drainage, and erosion control.
Attract pollinators: Many perennials provide food and habitat for beneficial insects, supporting biodiversity.

Overall, planting Green Roof Perennial Plants is a sustainable and beneficial practice that contributes to a healthier environment and more comfortable, energy-efficient buildings.

What are the characteristics of Green Roof Perennial Plants?

Green roof perennial plants need specific characteristics to thrive in the often harsh and challenging rooftop environment. Here are some key features to look for:

Adaptability:

Drought tolerance: They should be able to withstand periods of low water availability, as irrigation on green roofs can be limited or absent.
Sun tolerance: Most green roofs receive full sun exposure, so plants should be able to handle intense sunlight.
Wind resistance: Strong winds are common on rooftops, so plants need sturdy stems and flexible foliage to avoid damage.
Temperature extremes: Green roofs experience wider temperature fluctuations compared to ground-level gardens. Plants should be hardy enough to survive cold winters and hot summers.

Growth:

Low growing: Deep root systems are not ideal for green roofs with limited soil depth. Opt for shallow-rooted, compact plants that spread horizontally to form a dense cover.
Slow growing: Rapidly growing plants can become invasive and require more maintenance. Slower-growing perennials are easier to manage and maintain a stable ecosystem.

Maintenance:

Self-seeding: While some self-seeding is desirable to fill in gaps, avoid overly aggressive spreaders that could take over the entire roof.
Minimal fertilization: Green roof soils are often lean and nutrient-poor. Choose plants that thrive in low-fertility conditions and do not require frequent feeding.

Additional benefits:

Pollinator attraction: Flowering perennials can attract beneficial insects like bees and butterflies, enhancing the biodiversity of the green roof.
Aesthetics: Consider the visual appeal of the plants throughout the season, including flower colors, textures, and foliage variations.

Here are some examples of Green Roof Perennial Plants that meet these characteristics:

Sedums: These succulents are drought-tolerant, sun-loving, and come in a variety of shapes, colors, and textures.
Creeping thyme: This low-growing herb forms a dense mat, tolerates light foot traffic, and attracts pollinators with its fragrant flowers.
Moss campion: This small flowering perennial thrives in dry conditions and forms a colorful carpet with pink or white blooms.
Blue star creeper: This groundcover perennial features vibrant blue flowers and tolerates poor soil and drought.

Remember, the best plant choices for your green roof will depend on your specific climate, roof type, and desired aesthetics. Consult with a green roof professional or local nursery to select the most suitable perennials for your project.

How do I plant a Green Roof Perennial Plants?

Planting green roof perennial plants requires careful planning and preparation due to the unique environment compared to ground-level gardens. Here is a general guide, but remember to consult with a green roof professional for specific recommendations based on your location and project details:

Preparation:

Assess your roof: Understand the weight limitations, sun exposure, wind conditions, and accessibility of your roof.
Choose a green roof system: Different systems cater to varying plant needs and budgets. Extensive green roofs are lighter and use shallow soil for low-growing plants, while intensive green roofs support deeper soil and diverse plants.
Install the green roof system: Follow the manufacturer's instructions for your chosen system, including drainage, filter fabric, and growing medium installation.
Choose your plants: Select perennials that meet the characteristics mentioned earlier and are suitable for your climate zone. Consider a mix of plants for visual interest and ecological benefits.

Planting:

Pre-vegetate: Some systems involve pre-vegetating trays or mats with plants before installation on the roof. This can simplify planting and ensure good coverage.
Direct planting: If planting directly in the growing medium, ensure proper spacing according to plant size and desired coverage. Water thoroughly after planting.

Maintenance:

Watering: Water regularly during establishment, especially in dry periods. Follow a gradually reduced watering schedule as plants mature.
Weeding: Remove unwanted weeds promptly to prevent them from competing with desired plants.
Fertilization: Most green roof perennials require minimal fertilization. If needed, use a slow-release fertilizer formulated for green roofs.
Monitoring: Regularly check for pests, diseases, and signs of water stress. Address any issues promptly to maintain a healthy plant community.

Additional tips:

Start small: If you are new to green roofs, consider starting with a small area to gain experience before expanding.
Involve professionals: Consulting with a green roof designer or installer can ensure proper planning, plant selection, and installation for long-term success.
Local resources: Check with local nurseries or organizations specializing in green roofs for plant recommendations and expert advice.

Remember, planting a green roof is a rewarding endeavor that contributes to a greener and more sustainable environment. By following these guidelines and seeking expert advice, you can create a beautiful and thriving green roof that benefits both your building and the surrounding ecosystem.

What are varieties of Green Roof Perennial Plants?

Here are some popular varieties of Green Roof Perennial Plants, categorized based on their key characteristics:

Drought-tolerant succulents:

Sedum: These low-growing, diverse succulents come in various shapes, colors, and textures, making them a popular choice for green roofs. They require minimal water and thrive in full sun. Popular varieties include Angelina sedum, Firestar sedum, and Blue Spruce sedum.
Sempervivum: Also known as hens and chicks, these rosette-forming succulents are known for their hardiness and drought tolerance. They come in a variety of colors and textures, adding visual interest to green roofs.

Low-growing creepers:

Creeping thyme: This fragrant herb forms a dense mat, tolerates light foot traffic, and attracts pollinators with its pink or white flowers. It thrives in well-drained soil and full sun.
Moss campion: This small flowering perennial thrives in dry conditions and forms a colorful carpet with pink or white blooms. It attracts butterflies and requires minimal maintenance.
Blue star creeper: This groundcover perennial features vibrant blue flowers and tolerates poor soil and drought. It spreads quickly and can be used to fill in gaps in the planting.

Pollinator-friendly perennials:

Alyssum: This low-growing perennial produces masses of fragrant white flowers that attract bees and butterflies. It tolerates drought and poor soil conditions.
Echinacea (Coneflower): This native North American wildflower comes in various colors and attracts a variety of pollinators. It is drought-tolerant and requires minimal care.
Lavender: This fragrant herb attracts bees and butterflies with its blue or purple flowers. It thrives in full sun and well-drained soil.

Other interesting options:

Ornamental grasses: Certain low-growing ornamental grasses like blue fescue and carex can add texture and movement to green roofs. They are drought-tolerant and provide winter interest.
Sedum kamtschaticum: This unique succulent produces clusters of yellow star-shaped flowers in late summer. It is drought-tolerant and attracts pollinators.

Remember to consider your specific climate, roof type, and desired aesthetics when choosing green roof perennial plants. Consulting with a local green roof professional or nursery can help you select the most suitable varieties for your project.

Do Green Roof Perennial Plants attract pollinators?

Many Green Roof Perennial Plants are excellent at attracting pollinators! In fact, incorporating pollinator-friendly plants into your green roof design is a fantastic way to support these vital creatures and contribute to a healthier ecosystem. Here is why:

Pollinators need our help: Populations of bees, butterflies, and other pollinators are declining worldwide due to habitat loss, pesticide use, and climate change. Green roofs can provide much-needed habitat and food sources for these essential insects.
Green roofs offer a haven: By providing a diverse selection of blooming plants, green roofs create a miniature oasis for pollinators. The variety of flower shapes, colors, and bloom times ensures a steady supply of nectar and pollen throughout the season.
Specific plants for specific pollinators: Different pollinator species have different preferences. Some plants, like lavender and echinacea, are particularly attractive to bees, while others, like butterfly milkweed and zinnias, cater to butterflies. Choosing a mix of plants that cater to a variety of pollinators will maximize your green roof's impact.

Examples of pollinator-friendly green roof plants:

Sedum: Many sedum varieties, like Angelina sedum and Firestar sedum, offer attractive clusters of pink, red, or yellow flowers that attract butterflies and bees.
Creeping thyme: This fragrant herb forms a dense mat and produces small pink or white flowers that are a magnet for bees.
Moss campion: This small flowering perennial features pink or white blooms that attract butterflies and requires minimal maintenance.
Alyssum: This low-growing perennial produces masses of fragrant white flowers that are irresistible to bees.
Echinacea (Coneflower): This native North American wildflower comes in various colors and attracts a variety of pollinators, including bees, butterflies, and hummingbirds.
Lavender: This fragrant herb not only attracts bees and butterflies with its blue or purple flowers but also fills the air with a delightful aroma.

Designing a pollinator-friendly green roof:

Plant diversity: Include a variety of plants with different bloom times to provide a continuous food source for pollinators.
Native species: Consider incorporating native plants that are adapted to your local climate and provide specific resources for native pollinator species.
Minimal pesticides: Avoid using pesticides on your green roof, as they can harm pollinators and other beneficial insects.
Water wisely: Ensure your plants have access to adequate water, especially during dry periods.

By incorporating these tips and choosing pollinator-friendly plants, you can create a green roof that not only benefits the environment but also helps to conserve these essential creatures.

Are There Any Common Pests Or Diseases That Affect Green Roof Perennial Plants?

Even the hardiest of Green Roof Perennial Plants are not immune to pests and diseases. While the unique rooftop environment can deter some issues found in ground-level gardens, here are some common concerns to be aware of:

Pests:

Insects: Aphids, whiteflies, and beetles can target leaves and stems, sucking sap and weakening plants.
Grubs and caterpillars: These chewing insects can damage leaves and stems, especially younger plants.
Slugs and snails: These soft-bodied creatures feed on leaves, leaving behind slime trails and ragged holes.
Birds: Birds like pigeons may peck at succulent leaves or dig in the soil looking for insects.

Diseases:

Fungal diseases: Botrytis, powdery mildew, and rust can infect leaves and stems, causing discoloration, wilting, and stunted growth.
Bacterial diseases: Crown rot and bacterial leaf spot can cause wilting, browning, and leaf drop.
Non-infectious diseases: Nutrient deficiencies, drought stress, and excessive heat can also mimic disease symptoms.

Minimizing risks:

Plant selection: Choose resilient varieties resistant to common pests and diseases in your region.
Biodiversity: Planting a diverse selection of plants helps create a balanced ecosystem less susceptible to pest outbreaks.
Good drainage: Avoid overwatering and ensure proper drainage to prevent fungal diseases.
Monitoring: Regularly inspect your plants for signs of pests or diseases and address any issues promptly.
Minimal intervention: Avoid using harsh pesticides or fungicides, as they can harm beneficial insects and disrupt the ecosystem. Consider organic control methods like insecticidal soap or neem oil for minor infestations.

Remember:

Early detection and intervention are key to managing pests and diseases effectively.
Consulting a local green roof professional or botanist can provide specific advice tailored to your climate and plant choices.
Maintaining a healthy and balanced green roof ecosystem will naturally reduce the risk of pest and disease problems.

By understanding these potential challenges and taking preventative measures, you can ensure your Green Roof Perennial Plants thrive and contribute to a vibrant and healthy rooftop environment.

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