Kwekerij Maron B.V.

Kwekerij Maron was founded in 1985 in Pijnacker by Ton and Marian van der Burg. Initially they grew cut roses here, until their son Aron became involved in the company. In 2009, they took over the cultivation of terrace plants from Jan and Aad van Mil from Den Hoorn, as well as the cultivation of stem roses in pots. Aron took over the company in 2016. Aron wanted this so much because he loves to see plants grow from A to Z. What could be more rewarding than to be able to make almost 400,000 people happy with a beautiful plant on their terrace?
The company’s slogan is: ‘With the plants from Kwekerij Maron, your terrace is always in the sun’.

Aron wants to produce these plants as sustainably as possible and has opted for MPS A+ and MPS GAP certification.

Sustainability

Water
All the rainwater that falls on the roofs of the greenhouse and other buildings on the premises is collected in a large water basin. The water basin is 2 times larger than is really necessary to have enough clean water for the plants, even in extremely dry times. Fertilizer is added to the rainwater before it goes to the plants. Plants need these nutrients to grow well. They are now investigating whether good quality plants can still be grown with less water and fertilizer. And now they already 20% less water and fertilizers. All the water the plants do not absorb is collected, cleaned and reused. No water is wasted.

Crop protection
Kwekerij Maron chooses not to automate crop care, but does everything manually. This way all plants receive the attention they need and deserve. It is also a lot more eco-friendly than a machine that consumes a lot of fuel.

Climate
Considerable investments have been made in the past year in order to be able to do this as sustainably as possible. For example, buildings on the premises have been renovated and provided with good insulation. They installed 276 solar panels on the roof that provide the company with electricity. The greenhouse is also heated with geothermal heat instead of gas.
Diseases and pests are combated as much as possible biologically. At this moment the plants are already grown in a 90% organic way!

The industrial waste is separated, collected and processed by an approved waste processing company.

People

There are 4 permanent employees and in busy times about 10 temporary workers are added. All staff are remunerated and paid according to the standards of the Collective Labour Agreement for glasshouse horticulture. Within the company, everyone (if deemed eligible) is given the opportunity to grow to a different position.
Various initiatives are taken to involve the personnel in the company and the product. A good social rapport between the employees is highly valued.

For more information, please see www.kwmaron.nl

Health

Did you know that flowers and plants have a healthy effect on people?

Plants provide air purification..
People breathe in air, take out oxygen and breathe out carbon dioxide. In the case of plants it is the other way around. During photosynthesis, plants remove carbon dioxide from the air and convert it back into oxygen. The amount of oxygen in the air is increased by the presence of plants, which makes breathing easier.
Air-purifying plants can absorb harmful substances from the air through their leaves. These harmful substances are then stored and broken down in the plant’s roots. These plants can also break down dirty odours, so they are actually natural air fresheners.
For the sake of clarity, every (indoor) plant produces oxygen, but not every plant also purifies the air. Air-purifying plants are e.g. the Spathiphyllum, Calathea, Hedera helix (ivy), Areca palm and the Ficus. For many plants we do not yet know to what extent they have an air purifying effect since they have not yet been tested.
Plants ensure a better concentration and a reduction of stress.
Plants create a relaxed and better atmosphere, also at work.. Plants make the workplace a more pleasant place to work.
Apparently there is even a relationship between the presence of plants and the productivity of employees.
Moreover, the presence of plants has a positive effect on the creativity and concentration of people.
Plants reduce the dryness of the air
The dust content and humidity in the house are strongly related with each other. The dryer the air, the more dust. This can cause symptoms such as a tickling cough, dry skin, headaches and irritated eyes. By watering plants, it finally evaporates again through the stomata in the leaves. Plants can thus increase the humidity of the air, which therefore benefits the air quality.
Plants provide a pleasant and warm feeling
Research has shown that plants are good for people in various (subtle) ways. They play an essential role in creating a pleasant, natural and quiet environment in which to move, work and/or relax.
Did you know that flowers too have a healthy effect on people?
Flowers can brighten up any room in a magical way. They give meaning to our emotions such as love, joy, comfort, compassion and sorrow. Flowers provide a relaxing effect on our constitution. They provide positive energy in the home and a warm feeling. In short, everyone is just very happy about that!

Care

Skimmia:

Tibouchina, Gentiana:

Pandorea, Mandevilla, Abutilon:

Dahlia, Fuchsia, Plumbago:

Stamroos:

Innovation

The Dutch greenhouse horticulture sector is worldwide renowned for its innovative power. In order to be one step ahead of the competition from other parts of the world, people are constantly looking for better efficiency in the use of raw materials and space. This, of course, without compromising the (top) quality of the Dutch product.

The glasshouse horticulture sector in the Netherlands can cope with this rapid pace of innovation thanks to a strong relationship between research and practice. In addition, a great deal of knowledge is exchanged between the entrepreneurs in order to make progress together. The flower auctions are a good example of this as one of the largest cooperatives in the world.
Below we describe a few examples of this innovative power.

Biological control and integrated pest management
In order to minimise the use of pesticides and to find a better balance between parasites and their natural enemies, natural enemies of the parasites are used in the greenhouses. Thanks to the intensive exchange of knowledge between the growers and their suppliers, growers are increasingly able to produce a top quality product with organic solutions.

Combined heat and power (CHP)
Combined heat and power (CHP) is a large engine, originating from the shipping industry. Only it has been converted to run on natural gas. The efficiency of this motor is higher than traditional gas boilers. These engines drive a generator that generates electricity. This electricity is used in the company’s own nursery or is supplied back to the public electricity grid. The ‘residual heat’ produced by the engine is used to heat the greenhouses. After cleaning, the exhaust gases can be used to provide the plants with CO2. All in all, these motors provide an efficiency that can be up to 20% higher than the traditional method of heating (gas boilers).

Geothermal energy
Geothermal energy is used for this type of energy. A drilling tower is used to drill a well to a depth of 2-3 km. At this depth, water of more than 80 degrees can be ‘collected’. This heat is used to heat the greenhouses and then the cooled water is returned to the soil via a second source. It is expected that these sources will be able to continue to produce sufficient heat, even longer than the life of a greenhouse.

Drilling the well is an enormously expensive investment. In addition, there is a great risk that the drilling will ‘fail’. By working together with each other and with governments, in the Netherlands we are able to gain experience with this way of heating greenhouses sustainably.

Water purification
Plants need water and nutrients to grow. More and more nurseries are making use of the reuse of drainage water. This is water that is collected before it disappears into the subsoil. This ‘drainage water’ still contains many nutrients that can be used by the plants.
By reusing this water and mixing it with clean water, less fertilizer is used.
However, the drainage water also contains some ‘wrong substances’. The content of these wrong substances determines how much water can be reused. The application of new techniques creates opportunities to filter these ‘wrong substances’ out of the water.

Diffuse glass
In new constructions, more and more growers are opting to cover their greenhouses with diffuse glass. Diffuse glass ensures that light is distributed much more evenly across the crop without any shade or light spots. This leads to a more even greenhouse climate.
Temperature and humidity can thus be controlled more accurately, which means, for example, that the opening of the air windows can be limited, which leads to lower CO2 emissions.

LED lighting in greenhouse horticulture
A new innovation in horticulture is the use of LED lighting. This lighting is not comparable with LED lighting used in consumer use. In the horticultural sector, the lighting is produced by ‘power LEDs’ and therefore much higher. The major advantage of these ‘power LEDs’ is related to sustainable business practices: energy savings compared to high-pressure sodium lamps (orange-coloured lighting). This saves more than half of the energy.
Another major advantage is that when using LEDs, crops can be better controlled using the different colours in the light. This is in favour of a better growth and a higher quality of the product.