The sides of the roof may also need to be built up to accommodate the additional layers.
Green roof alliums.
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.
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.
The combination of elevated temperatures wind exposure and high light provide challenging conditions for plant growth.
Nodding onions on a green roof in edmonton canada.
Alliums north america.
Nodding onions on a green roof in edmonton canada.
It is native across canada and the eastern us.
Two alliums that are useful on green roofs are allium cernuum and allium.
Aside from chives there are a few native ones in north america that can used.
Allium summer beauty creates a visually noticeable vertical accent adding some height to an extensive roof planting while increasing the potential for biodiversity.
Foliage colors can vary from green to yellow red and blue and flowers from white yellow and pink to reddish.
Sedums and other low growing succulents that need little water and can survive in.
Alliums have no serious insect problems as the sulfur compounds they produce apparently help ward off insect pests.
Like chives it is also edible.
Another allium that is native to the north america is the prairie onion allium stellatum.
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.
While varieties of succulents and cactuses as well as short grasses from the allium family have proven to be successful green roof plants nothing seems to succeed like sedums.
An allium is a member of the onion family hence the name.
Plant selection requires careful consideration of site microclimate substrate and maintenance factors linked to the desired aesthetic functional and management outcomes for the project.
Foliage may remain green in some locations or in mild winters.
A large and diverse genus of flowering plants with some 600 species sedums can shut down their systems in extreme heat and drought to keep from losing water to.
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 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.
