Veg Gardening and climate change

Sat, Mar 24, 2012

Grow your own, Guest Blogs, Vegetables

This guest post has been written by Peter Kearney who created and runs the excellent City Food Growers web-site from Brisbane in Australia.

Peter uses his horticultural knowledge and practical experience to explain how vegetable gardens can adapt to changing temperatures and unpredictable weather.

Being in tune with your local climate is one of most important success factors for gardening. Climate change has complicated the picture for vegetable gardeners, but there is a silver lining. With the right knowledge at the right time, food gardeners can actually grow more because of climate change.

Changing climate has in general brought greater extremes of temperatures with warmer and longer summers and often more extreme cold in winter, but on average, higher temperatures throughout the year. Food gardeners are finding that choosing vegetable crops with the methods they have always used is giving them results they don’t expect.

For many gardeners, figuring out when its right to plant vegetables is based on one or more of the following:

  1. What they have always done – This is reliable so long as it has worked in the past, but climate change alters the picture.

  2. Planting calendars – Most planting calendars use very broad zones for recommendations which do not account for local temperature variances. These zones are based on climate definitions which may be up to 100 years old. So with temperatures changing, the zones are becoming more inaccurate each year.

  3. Advice from a nursery – Seedlings are often grown in temperature controlled environments and may come from thousands of kms away, so it very possible they are not in season for your local climate.

  4. Emotion – Whenever you do things in the garden without some objective thought, the results will invariably tell you to go back to drawing board.

Vegetables are very sensitive to temperatures at planting and over their growing period. Frost is a killer for many vegetables. If you plant too early or too late in the season you may be hit with frost. If it is hotter earlier in the season, there are many crops you could get underway which you would not normally grow at that time and because of extended warm periods you could be staging your crops for much greater production. There may be crops that you thought would not grow at all, but are actually now very suitable for your climate.


In a changing climate, the biggest opportunities for a healthier and more productive garden include:

  1. Extending your cropping time due to more heat and by becoming more aware of protecting your plants from frost and temperature extreme’s.

  2. Planting new crops that were not previously suited to your climate.

  3. Reducing the potential for crop loss by getting more accurate with your planting times.

Our web site planting calendar has been specifically designed to deal with these three opportunities . We have detailed local climate information and climate profiles for all the food plants in our web site. So you don’t need to know how to work through climate data, our Gardener subscriber planting calendar does it for you at the click of a mouse. It incorporates:

  1. Local temperatures – Averages over the last 7-20 years (Australia, NZ and USA) . Its fascinating to see how much average temperatures have changed in Australia over the last 100 years compared to the last 10. Our web site deals with this climate change by you simply choosing your closest weather station to create your climate profile and you can easily fine tune this for your location in relation to the weather station and for micro-climates you may have created in your garden.

  2. Frost data – Our site incorporates frost data for all the weather stations (Australia only at this point) so you can see your frost profile and easily manipulate the profile if you can protect your plants from frost, thereby increasing the number of plants you can select and your cropping time

  3. Detailed climate profiles on more than 130 vegetables and herbs – These are all matched to your climate profile in the site calendar so when you search by day, by month or by crop and you get a list of ideal or OK crops to work with. This not only gives you the best times to plant the crops you know, but opens up the opportunity find crops you have not worked with before.

  4. Climate warnings – Based on averages, the site tell you when there will be frost days, too much heat or cold during the growing period of the crops you have selected, so you can have advance warning to protect your plants.

In these times of climate change, the objective knowledge on planting and climate in our Gardener subscriber site and its ease of use, gives you the power to make timely decisions on managing your vegetable garden. It will help you achieve greater success in your food garden.


This excellent site currently provides gardeners living in Australia, New Zealand and America the opportunity to adapt to climate change by simply choosing their closest weather station to create a local climate profile. This can then be fine tuned for your location in relation to the weather station and for micro-climates you may have created in your garden.

Peter is planning to launch this useful system in the UK during 2011. If you would like to be included in the trial please e-mail at [email protected]

This post was written by:

- who has written 872 posts on My Climate Change Garden.

I am not an experienced gardener - more of an enthusiastic amateur who learns by trial and error and who is keen to "manage" the effects of shifting weather patterns on my garden. Writing this blog is my passion and it has evolved over 12 years to inspire engagement with climate change outside our back doors, in our personal gardens and green spaces. My mission is to fertilise and expand this platform to grow a community of global gardeners communicating about the effects of climate change on our plants and exploring how each individual can make small changes in our lives to become more sustainable. The future of our gardens and #OurPlanet is in our hands - please plant your own seeds for our collective sustainable future.

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1 Comments For This Post

  1. SowandSo Says:

    What a great initiative and I am very much looking forward for a system like this in Europe. With this warm spring we are having right now I am tempted to plant sooner then usual but last year most of my crops died of a sudden frost mid May!
    For that reason I am hesitant to plant out seedlings but I do not want to miss out on this warm sunny weather.