For a green roof you need small hardy perennial plants that don t need much tending.
Green roof alliums.
It works well when planted in groups in rock gardens border fronts containers and window boxes its pink flower heads are 3 6 inches across held above 3 4 inch wide gray green leaves.
Two alliums that are useful on green roofs are allium cernuum and allium.
Plant selection requires careful consideration of site microclimate substrate and maintenance factors linked to the desired aesthetic functional and management outcomes for the project.
However they should not make up the bulk of the plant mix but rather be used as accents.
Root rot may be a problem in waterlogged growing media but poor drainage should never be a problem on a properly designed and installed green roof.
Sedums and other low growing succulents that need little water and can survive in.
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Most herbaceous perennials have limited drought tolerance and the ability to thrive in an extensive vegetative green roof without supplemental irrigation.
Green roofs are hostile sites.
However some species of alliums dianthus and phlox have shown promise as accent species in some.
Nodding onions are also sometimes referred to as lady s leek.
Like chives it is also edible.
One of the favourites that we have seen in canada is nodding onion allium cernuum.
Known for having leaves that look as good as it flowers turkistan onion is among the shorter ornamental allium varieties.
An allium is a member of the onion family hence the name.
Alliums have no serious insect problems as the sulfur compounds they produce apparently help ward off insect pests.
Another allium that is native to the north america is the prairie onion allium stellatum.
Nodding onions on a green roof in edmonton canada.
It is native across canada and the eastern us.
Nodding onions on a green roof in edmonton canada.
Aside from chives there are a few native ones in north america that can used.
Foliage colors can vary from green to yellow red and blue and flowers from white yellow and pink to reddish.
The combination of elevated temperatures wind exposure and high light provide challenging conditions for plant growth.
Contains a blend of available allium bare root bulbs from our range of green roof appropriate allium stock.
Various low growing 6 10 tall alliums can be used for accent and they typically have green or bluish foliage and flowers of white pink or purple.