Skip to main content

The Rooftop Gardens & Green Roofs

Up on the Roof

There are always options and that is the approach that I take to gardening and most other aspects of my work and life. When it comes to gardening, if you want to grow something green you can. Your desire and your imagination will wake up the creative energy that is needed to overcome obstacles and enable you to design a garden to fit your space.

If you can’t grow in the ground, use containers or raised beds, if you have limited space think vertical.

One area that is often overlooked when planning a garden is the roof top.

Now your house may not have a roof that suits a garden; it may be too slanted or does not have easy access for regular gardening chores.

It is important to make the distinction between a rooftop garden and a green roof, while there are some similarities, they generally serve different purposes.

Green Roofs:

Green roofs are a roof that allows plants, trees and shrubs to grow in a specially designed light-weight growing medium.

The three main types of green roof systems are:

  • complete systems where all the different components including roof membrane are an integral part of the whole system
  • modular systems that are positioned above the existing roofing system
  • pre-cultivated vegetation blankets that consist of growing medium and plants that are rolled onto the existing roofing system with drainage mats and root barriers as required

RoofTop Gardens

The rooftop garden is simply a garden, usually in containers, that is located on a rooftop. The rooftop may be a house, an office building, a garage,shed or any other structure that has a suitable surface and is strong enough to take the extra weight.

BE sure that the roof you choose can handle the extra weight, or you may get a major surprise. You may need to consult with a structural engineer before proceeding, remember that in addition to the garden, there will be at least one person adding to the overall weight.

If you are ready to proceed in the design of a roof top garden the process that you are beginning is similar to combining interior decorating with landscape design.

Scroll to Continue

Step One:

What is the purpose of the space? If you are looking to grow a container or two of herbs and vegetables that is one thing; if you are planning a community garden that is another.

Or, are you designing an outdoor space for relaxation and entertaining that incorporates flowers, shrubs and trees into the design?

It is possible to set up an orchard on the roof as long as the containers you use are big enough.

Step Two:

You know the space’s purpose; now what do you want to grow?

Step Three:

How much time do you want to devote to gardening? If your time is limited you may want to keep the garden element of the design small, you can always add later, enough so that you can give the plants the attention they deserve.

Be sure to make notes as you go; you will want to refer to them as you proceed.

What you do next will depend upon the answers to the questions raised in the first three steps. If you are adding an outdoor room to your home then you need to think about furniture, for example; if you are growing food, then all that is left to do is decide what food you want to grow.

Some considerations, the weather conditions on a roof top, much like a balcony, will be different than those at ground level, there may be little to no shade so it will be hot and the winds will be stronger.

The combination of heat and strong winds means that the soil will dry faster than it will in the garden and therefore, the plants will need watering more frequently.

This brings us to another point, water overflow; containers can be designed to catch excess water so that it does not puddle on the roof, making for slippery conditions and added weight. I suggest you hand water your roof top garden so that you get sued to the plants’ needs and thus avoid excessive watering.

A roof top garden is an ideal place to grow native perennials. They will be able to handle the ecosystem and you will be helping maintain the native plant population. This will also encourage native butterflies and birds to drop by for a visit.

Green Roofs

  • City of Toronto: What is a green roof
    Description of the types of green roofs, including intensive or extensive, new or retrofit, complete systems, modular systems, pre-cultivated vegatative blanket


  • garden
    There are many benefits of a rooftop garden beyond the fact that they can be quiet retreats. They add another dimension of green space to an urban scape without taking up an extensive area of land in densely populated places. In some European countri


Bob Ewing (author) from New Brunswick on January 06, 2011:

Consulting an expert before proceeding is a must.

roofing company in Miami on January 05, 2011:

We've heard the story about the Hanging Gardens of Babylon. Some of us may have dreamt about this one day. Now we have a chance to have this, because of the improved roofing we have today. If you're planning to have this one, better ask an expert about it, so you can plan on how to work with your green roofing.

Bob Ewing (author) from New Brunswick on February 11, 2010:

Greeting, you might find this useful

spiderspun from Utopia, Ontario Canada on February 11, 2010:

Container Gardening, I was wondering if it had a name. This is what I have to switch my gardening over to this year because I won't be able to run a full garden since my accident. Any container tips out there would be great. My property is huge. Things have to be raised or elevated for me.

thanks for your info

Bob Ewing (author) from New Brunswick on July 19, 2009:

Agree, a great urban getaway, thanks for dropping by.

Plants and Oils from England on July 18, 2009:

What a wonderful hub! Roof gardens are so often a special little hidden oasis in the city.

Bob Ewing (author) from New Brunswick on July 11, 2008:

Thank you for stopping by and I am pleased that the hub was helpful, all the best.

jonnhel cortez on July 11, 2008:

the study was very interesting.i'm a third year arhitecture student and i want to learn further regarding the topic for it is a big help in the problem we are experiencing now...thank you..,Godbless

Bob Ewing (author) from New Brunswick on June 01, 2008:

HI , and thanks for the comments, let me know what your faher and brother think, if you can, Bob is a sound nickname. :)

Michelle Simtoco from Cebu, Philippines on May 31, 2008:

Hi Bob, very helpful tips on roof gardening. I will forward it to my brother who is an architect...and my Dad whose nickname is Bob too :)

Marye Audet on May 25, 2008:

fantastic! Thanks Bob!

Bob Ewing (author) from New Brunswick on May 24, 2008:

a green roof will add insualtion and absorb water that woudl otherwise run off.

cgull8m from North Carolina on May 24, 2008:

Another great article to refer when we plan this. I also heard they keep the buildings cool at all times save energy also? Some of the plants could be used to filter the water also. I heard there was one in Ford plant in Michigan.

Related Articles