extensive green roof on a small shed

DIY Green Roof Guide

The online resource for building small scale green roofs on garden sheds, garages, house extensions and other small construction or retrofitting projects

a green roof on a new bike shelter

New Builds

A step by step guide to creating a SAFE and LEAK FREE green roof on a new small scale construction project. Learn from the vastly experienced authors how to accomplish it yourself or provide guidance to your contractors

poppy and harebell as green roof plants

Plant Lists

Planting suggestions focussed on native species that can provide the maximum biodiversity. Separate lists for the UK, Eastern USA & Canada, Mid-West USA

a small green roof on an electrical substation

Retrofitting

Even the smallest of roof spaces can provide a small haven of beauty and a wildlife oasis. The retrofitting section advice can be used on garden sheds, cycle & bin shelters, the fundamentals remain the same!

gabion edge details of a green roof

Detailing

From suggested screw sizes through edge details to drainage suggestions, John & Dusty take you through the process using text, photos, illustrations and videos

Native alliums – green roof plants US to UK

by | Sep 7, 2016

Alliums are always a great choice for green roofs. Furthermore there are native allium species across North America and Europe (including the UK and France. In fact Allium schoenoprasum, one of the most commonly used has a circumpolar distribution. Called chives in English, it is a widely used herb.

Species lists for US and Canada

We are using these plants to alert people to recent additions inside the guide. We have now create lists of native green roof plants for Quebec, eastern Canada and Ontario. Many of these will be appropriate to north eastern US.  We have also added a list for the mid-west US – again many of which will be appropriate for central Canada. Further lists to cover other areas will be added in the near future.

 

During long drought 2011 - Dry tiimes

Chives flourishing during long spring drought 2011

 

Alliums – North America

Aside from Chives, there are a few native ones in North America that can used. One of the favourites that we have seen in Canada is Nodding onion  (Allium cernuum). It is native across Canada and the eastern US.

Alliums - nodding onions

Nodding onions on a green roof in Edmonton, Canada.

 

An allium is a member of the onion family, hence the name. Nodding onions are also sometimes referred to as Lady’s leek. Like chives it is also edible.

Another allium that is native to the North America is the Prairie onion (Allium stellatum). The plant’s latin name refers to the starry shape the umbels of the flower make. This species is found across central Canada and the mid-west of the US.

All alliums are attractive to wildlife, especially butterflies and in North America even hummingbirds.  However, bears are rather partial to alliums as well, but how they get onto the roof is an open question!!!!

Hardiness – Alliums are where it is at

The great thing about native onion species compared to non-native more showy ones, is their hardiness. Our experience of extensive droughts in south eastern England is that the one plant that positively thrives in these conditions is chives. So all in all native alliums are a great choice. Hardy, attractive to look at and for wildlife they are definitely one to consider.