Nodding onions on a green roof in edmonton canada.
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.
Sedums and other low growing succulents that need little water and can survive in.
Nodding onions are also sometimes referred to as lady s leek.
For a green roof you need small hardy perennial plants that don t need much tending.
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Alliums north america.
Foliage colors can vary from green to yellow red and blue and flowers from white yellow and pink to reddish.
One of the favourites that we have seen in canada is nodding onion allium cernuum.
Most herbaceous perennials have limited drought tolerance and the ability to thrive in an extensive vegetative green roof without supplemental irrigation.
It is native across canada and the eastern us.
Green roofs are hostile sites.
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.
Alliums have no serious insect problems as the sulfur compounds they produce apparently help ward off insect pests.
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.
Another allium that is native to the north america is the prairie onion allium stellatum.
Aside from chives there are a few native ones in north america that can used.
Contains a blend of available allium bare root bulbs from our range of green roof appropriate allium stock.
However some species of alliums dianthus and phlox have shown promise as accent species in some.
An allium is a member of the onion family hence the name.
An allium is a member of the onion family hence the name.
Two alliums that are useful on green roofs are allium cernuum and allium.
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.
Like chives it is also edible.
Species could include allium schoenoprasm and cultivars allium cernuum allium senescens and subspecies etc.
