An allium is a member of the onion family hence the name.
Green roof alliums.
Species could include allium schoenoprasm and cultivars allium cernuum allium senescens and subspecies etc.
Nodding onions on a green roof in edmonton canada.
Most herbaceous perennials have limited drought tolerance and the ability to thrive in an extensive vegetative green roof without supplemental irrigation.
One of the favourites that we have seen in canada is nodding onion allium cernuum.
Nodding onions are also sometimes referred to as lady s leek.
Green roofs are hostile sites.
Foliage colors can vary from green to yellow red and blue and flowers from white yellow and pink to reddish.
An allium is a member of the onion family hence the name.
It is native across canada and the eastern us.
The combination of elevated temperatures wind exposure and high light provide challenging conditions for plant growth.
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.
For a green roof you need small hardy perennial plants that don t need much tending.
Known for having leaves that look as good as it flowers turkistan onion is among the shorter ornamental allium varieties.
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.
Posted in uncategorized with tags alliums bio tray drainage layer edge restraint extensive green roof filter fabric green roof green roof edging green roof media green roof plants green roof solutions green roof technology green roofs hybrid roof intensive green roof moisture retention roof garden rooftop planters sedums.
Sedums and other low growing succulents that need little water and can survive in.
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.
Nodding onions on a green roof in edmonton canada.
Contains a blend of available allium bare root bulbs from our range of green roof appropriate allium stock.
However they should not make up the bulk of the plant mix but rather be used as accents.
Alliums north america.
Aside from chives there are a few native ones in north america that can used.
Like chives it is also edible.
Plant selection requires careful consideration of site microclimate substrate and maintenance factors linked to the desired aesthetic functional and management outcomes for the project.
