If you do not have access to a parcel of land or if you want to create a vegetable garden where there is simply no ground available – for example, in a parking lot or in an alley, you may want to consider growing your vegetables and herbs in a tray.
A bac vegetable garden on legs
A tray garden in raised has the advantage of removing the cultures of the street and thus prevent water runoff carrying a variety of contaminants such as hydrocarbons may reach the soil in which are planted edible plants.
The wood is the material that most people choose for the construction of bins, vegetable gardens. You can also opt for a material that is rot-resistant, such as wood, composite, stone, or steel plates.
Although wood is a material very common and inexpensive, it can rot quickly in contact with the earth. Choose a wood very durable, such as oak or cedar, commonly known as cedar, and make sure you cover the inner part of the walls with extruded polystyrene or with a geotextile membrane thick, ideally plastic.
Avoid at any price the treated wood and instead use torrefied wood, since in addition to being little subject to decay, it emits no toxic substance. You can even burn the wood yourself using a welding torch. This japanese technique is ancient, called shou-sugi-ban, prevents the micro-organisms in the soil decompose the wood.
In order that the charring protects the timber, the planks must be burnt on at least three millimeters thick. If the wood is not sufficiently burned-in-depth, the crust of the carbon protective will disappear after a few rains only.
The vegetable patch table
A table, garden well laid out can become a focal point, a component feature of a garden.
A variant of the bin vegetable garden on legs, the table garden allows for the cultivation of edible plants in urban areas where it is not possible to do in the midst of the earth.
The table garden allows gardeners with disabilities who travel by wheelchair or to those who are not able to stoop or kneel down to enjoy the fun of gardening and harvesting herbs and vegetables. As it is not directly sitting on the floor, table, garden prevents rabbits and marmots to come and chew the vegetables that are cultivated there.
A table, garden prefabricated covered with agrotextile in order to prevent the attacks of insect pests and squirrels.
You can easily build yourself a table vegetable. It is simply to recover an old table that you own or that you have found at a garage sale, or on the edge of the street – the day after the 1st of July ! –, to surround the perimeter with sides in wood, cover the inside of a canvas raincoat or a geotextile membrane and soil.
You can also find on the market tables garden were prefabricated in wood, steel or other materials. It is new, or recovered, make sure that the bottom of your table, gardening is pierced with several holes to allow the water surplus to drain off.
The calendar of the gardener
The work to be done at the end of may :
- Carry the seedlings to the outside of the beans, cucumbers and squash.
- Perform the planting on the outside of the vegetables of tropical origin, such as eggplant, cucumbers, peppers, and tomatoes.
- Complete the planting of the annual flowers of tropical origin, such as the begonias, the impatiens and petunias.
- Perform the planting on the outside of the bulbous plants of tropical origin, such as the cannas, the colocasias and dahlias.
- Apply compost and a slow-release fertilizer rich in nitrogen on the lawn.
- Perform the seeding of turf.
The consumption of vegetables grown in the city-does it have a risk ?
Simple planks of composite wood were used to create a tray garden around this tree street, without, however, bury the collar of his trunk.
Some scientific studies conducted recently show that most of the vegetables urban can be consumed without a problem, ensuring all the same to take certain precautions.
In urban areas, particularly near major arterial roads, it is likely that the dust and soot from the combustion of diesel engines settle on the leaves and fruit of garden plants. Some contaminants in the soil can also be absorbed by edible plants, including root vegetables.
As the fruit-vegetables, leaf vegetables and root vegetables absorb nutrients and accumulate pollutants differently, the three types of vegetables were tested in the context of a scientific study conducted by researchers from the University of Kansas and published in 2015 in the Journal of Environmental Quality. The majority of tomatoes and cabbages grown in the course of the experiment showed low rates of pollutants, on the other hand, the cores contained high amounts of lead.
Scientists from the technical University of Berlin have discovered that some root vegetables such as carrots and turnips, grown in urban areas where road traffic is high contained high amounts of heavy metals. The results of their study show that samples with a rate of pollutants is lower correspond to the vegetable gardens located in areas of the German capital where there are some barriers that limit the contamination by heavy metals, such as buildings, the presence of a forest, dense urban or a significant amount of parks and private gardens.
In the private gardens, the air pollutants of big dimension, such as dust and soot are deposited on the leaves, but they are not absorbed by the plants. It is so clean and wash the vegetables-fruits and leafy vegetables before you eat them. As for the root vegetables, it is essential to grow the crop in a healthy soil, rich in compost and free of contaminants – the ideal is to use a potting soil business-based compost and sphagnum peat. It is also important to properly clean them or peel them before eating.
However, the edible plants cultivated in the vicinity of arteries of traffic, may be exposed more readily to pollutants, especially to oils, fats and hydrocarbons, at the time of the rains, where these substances may reach the plant due to splash and runoff. Therefore, it is better to cultivate vegetables in a tray raised, at a minimum distance of three or four metres of a road.
Build a tray garden in 5 steps
The bins, vegetable gardens, whose walls are made of steel and will last many decades.
1. Install your container vegetable garden in full sun
If you want to reap vegetables in abundance, you need to ideally install your container garden in a sunny spot, away from mature trees. Although some edible plants, like swiss chard, carrots, spinach, mint and persil, can tolerate some shade, most vegetables need at least six hours of sunlight per day to grow and develop.
2. Use a durable material
To make the walls of your container vegetable garden, using preferably a durable material such as oak or cedar, composite wood, stone, or steel plates. However, please do not hesitate to pick up some materials for the manufacture of your tray. Walls made of bales of straw, branches of trees plaited, old concrete blocks or a culvert in the metal will certainly a lot of charm and originality to your container garden while significantly lowering the cost of its construction.
3. Make a deep bin
There are no really specific rules about the dimensions that should have a tray garden. However, in order that the garden plants have deep roots and they have a maximum generation, you need a tray the walls of which are at least 40 to 45 cm (16 “to 18”) in height. As for its width, it should not be more than 90 cm (3 ft), otherwise it will be difficult to have access to the center of the tray to be able to weed, water and harvest.
4. Add potting soil
If your tank is positioned directly on the earth, it is possible to recover it, after having removed the turf, and mix the compost in order to obtain the desired height. However, if you install your bin on a paved surface or concrete, or on a contaminated soil, it is then necessary to fill it up with potting soil trade, taking care to separate it from the existing soil using a geotextile membrane is thick but permeable.
5. Create walkways
If you build several trays to carry out your vegetable garden, make sure you install them at a distance of 30 to 45 cm (12 to 18 inches) from each other and, on the fairways as well created, spread a thick layer of mulch, whether organic or mineral in order to avoid having to weed constantly. You can install a geotextile membrane or bags of thick plastic recovered under the mulch to prevent the growth of grass junk.