Gardening or urban farming brings elements of sustainability, community, and nature education to the city and into our lives. It creates an environment for people from all walks of life to share the knowledge, skill and joy of growing their own organic produce. At Wildroots Organic, we’ve had great results growing on rooftop farms throughout the city, and teaching urban farming courses at … Continue reading Urban Farming Redefined: 100% Upcycled
Green roofs have once again hit the headlines when the government announced on Wednesday that no one will be prosecuted for the City University of Hong Kong (CityU) roof collapse last year. Safety was the key concern but this incident also prompted questions about the benefit of green roofs. The collapsed CityU roof was essentially a carpet of vegetation that very few people had a … Continue reading Urban rooftop organic farming all-win solution for Hong Kong
Written By Lau Hoi Lung. Translated by Angeline Chan. Soaring property prices, shortage of elderly homes, lack of places for people to enjoy intimate relationships – it seems as though no social problem in Hong Kong is far removed from land issues. The government keeps banging on about limited land supply, lending credence to the saying “Hong Kong is a densely populated city”. Studies on … Continue reading DO WE KNOW OUR SOIL?
Click here to view CNN’s story on Urban Farming in Hong Kong Continue reading Urban Farming in Hong Kong on CNN
Urban farming on rooftops has been gaining traction in cities around the world. Its rise can originally be traced to consumers increasing awareness of carbon emissions that result when our food travels hundreds, if not thousands of miles from the farm to our table. As an experienced urban farmer that grows on the rooftops of commercial buildings such as the Bank of America Tower, and … Continue reading Rooftop Farming
In Hong Kong, it’s easy to forgive the impression that we have transitioned to a post-soil society, where with enough concrete and wifi all of our needs can be met. We aren’t there yet and never will be, as soil is an irresistibly efficient way of providing nutrients for food crops to grow. It is the most valuable asset of a farm. Before we get the chance to finally appreciate soil, it may soon disappear. Agronomists predict that within 60 years global soil systems will be irreparably degraded.
Soil is a simple word that describes a complex ecosystem consisting of five essential components. Much of soil is a combination of minerals essential for plant health. Organic matter is made up of plant and animal remains that have been broken down by microorganisms, such as fungi and bacteria. Microorganisms are nature’s diligent nutrient recyclers. Soil needs to be loose to allow gases (oxygen, carbon dioxide) that are essential to the life processes of microorganisms and roots to circulate. Finally, water dissolves and transports nutrients to plant roots. Ideally, all five components are present in relative abundance. Soil composition and quality can vary widely, which is why organic farmers add compost and organic fertilisers to soil.
It may be tempting to grow crops without soil by using water-based hydroponic systems. These systems however have significant drawbacks. First, they can only provide for a fraction of our food needs. They are unable to grow large quantities grain such as rice, wheat, soya and corn that account for 60% of our diet (much of this is fed to the animals we eat). Second, they are capital and energy intensive, making them uneconomical except in circumstances where there is an abundance of both and a shortage of arable land (such as the Middle East). Continue reading “Soil Matters!”
Amaranth or Yin Choi It’s easy to condemn the use of synthetic fungicides, insecticides and herbicides by conventional farmers. They, however, are at the mercy of conditions over which they have little to no control. These unsafe toxic compounds provide effective solutions for plant diseases, insect attacks, and weed infestations. Conventional farmers tend to overuse these cheap chemical tools, rather than risk suffering a poor … Continue reading Farming in the Summer
July 2014. A Hydroponic facility under construction near Hok Tau. Turning green into desert.
Hydroponic systems are touted by their promoters for safety and high yield. They claim hydroponically grown produce is safe from pollution because the vegetables are entirely detached from the ground. They also claim to be free of pesticides because hydroponic systems are usually housed in enclosed structures that keep pests out. According to it’s proponents, the high yield makes it suitable for a space-deprived Hong Kong.
Agriculture is an industry that exists within our economic system. As such, the laws of economics must apply to it. The law of comparative advantage, familiar to any first year economics student, states that we should specialise in areas where we have an advantage and trade with others for goods in areas where we do not. Both parties to the trade will end up better off.
Large-scale hydroponic systems were developed by the US military in the 1950’s to supply fresh vegetables to soldiers stationed on remote islands. The remoteness of the islands made the transport of fresh food costly and difficult. The barren soil made it unsuitable for growing on the land. Hydroponic facilities are factories that can produce “safe” vegetables anywhere, irregardless of the surrounding environment.
If hydroponic factories are completely safe because they are detached from the land then it doesn’t matter where they are located. The only requirements are land, labor and sources of water and electricity. Land, labor and water are significantly cheaper one hour away, in Shenzhen. If land and labor in Shenzhen are 1/3 to 1/4 the cost of that in Hong Kong, then a hydroponic facility in Hong Kong would be at a huge comparative disadvantage. The same “safe” vegetables could be produced in Shenzhen at a fraction of the cost. (It is for this reason, the law of comparative advantage, that all clothing factories have long since moved from Hong Kong to China.)
Since any first year economics student could arrive at this conclusion, might there be another reason why savvy businessmen (the owner of the facility in the photo above is the former CEO of Esprit, whose clothing factories are located in China) and highly educated bureaucrats are furiously promoting hydroponics? Continue reading “Hydroponics and Property Development”
Can you guess which one is organic? Read on to find out
Many people exhibit a sudden interest in organic food when they or someone in their family has been afflicted with cancer. Are they just grasping for links or is there any factual basis for their concern that the way modern food is grown can contribute to cancer? Let’s review how conventional leafy green vegetables, such as Choi Sum or Bak Choi, are typically grown in Hong Kong. All the chemicals listed below are approved and readily available for sale in Hong Kong.
Prior to growing a new crop, conventional chemical farmers spray a broad-spectrum systemic herbicide, such as Glyphosate, to kill weeds in the soil. “Broad-spectrum” means that it is effective against a wide a variety of plants – it is toxic not only to the weeds but also to the vegetables that will subsequently be planted. However, it’s concentration will have been diminished by the time the vegetables are planted. The residual toxicity will still weaken the vegetable. A weaker plant is more susceptible to pests and disease. As such, farmers need to apply higher quantities of pesticide later on to protect the crop from insect attacks.