Planning your vegetable garden

During the long winter months, it's the perfect time to plan your vegetable garden. You need to organize crop successions in the garden so that the soil maintains its mineral balance and pest and disease problems are very rare. The organization of these crop successions is based on very simple rules: crop rotation and companion planting. Here's what they consist of.

Crop Rotation

Crop rotation is a technique that involves planting different types of plants with varying characteristics and requirements in a given area, for as many years as possible. By applying this technique, you ensure the soil's long-term mineral balance, prevent disease and insect problems, and rationalize the use of compost and fertilizers.

Oat green manure after a cucurbit crop

Applying the Technique

Depending on the size of the plot and the planned crops, you can opt for a three, four, or even five-year rotation plan. To do this, you must divide the growing space into three, four, or five sections that will rotate with each other.

In organic farming, a section of intensive green manure is often included in the rotation, which helps rest, sanitize, and enrich the soil. However, if you only have a small plot, you can establish green manure crops only after harvesting or before establishing the main crops. For example, you can grow fodder peas in May before establishing cucurbits in early June, just as you can sow oats after tomato crops.

To organize crop rotation in the vegetable garden, two main factors are considered: the compost requirements of the cultivated species and their plant family.

Compost Requirements of Cultivated Species

"Greedy" plants, which thrive on abundant, young compost, are cultivated at the beginning of the rotation. These include corn, tomatoes, eggplants, artichokes, squash, and cucumbers. In the second year, plants that require mature compost follow. These are primarily leafy vegetables: lettuces, chicories, spinach, leeks, celery, and all cabbages. Then, frugal plants complete the rotation cycle with light applications of mature compost, as residual organic matter can adequately meet the low needs of carrots, turnips, onions, beets, beans, and peas.

Thus, for a four-year rotation, tomatoes could be followed by cabbages, which would be followed by carrots, then by a green manure crop in the last year. One could also conclude the rotation with a pea or bean crop. Similarly, one could organize a succession of cucurbits, leeks and celeriac, beets and turnips, then green manure. In both cases, young compost would be applied in the first year, mature compost in the second; very little or none in the third and fourth years.

Compost doses would vary from 1 to 3 cm on the beds depending on the requirements of the crops established there, i.e., 3 cm for greedy plants and 1 cm or none at all for frugal plants.

Compost requirements of main crops

The Family of Cultivated Species

To prevent parasitism and mineral imbalances in the soil, plants from different families must be grown in succession.

Since plants belonging to the same family have similar nutritional needs and are most often susceptible to the same diseases and pests, by varying the families, the gardener effectively prevents mineral imbalances in the soil as well as parasitism.

Families and vegetative forms of main vegetables

* Actually an inflorescence but considered a leaf

The Rotation Plan

To facilitate the application of the crop rotation technique over time, the gardener must draw their garden plan each year, indicating the location of different crops as well as compost and fertilizer applications. This way, they can, based on their observations and new needs, modify their plan and integrate new species into the garden, without deviating from the fundamentals of the technique.

The rules of crop rotation may seem rigid and restrictive. But once they are well understood, they guide the gardener in their planning while allowing them to create original, productive gardens free from severe or recurring infestations.

Companion Planting in the Garden

When choosing to opt for ecological cultivation, one must consider their garden as a living microcosm in which all components are in close and permanent relationship. The sum of these interactions ensures that the environment behaves like a true living body, possessing its own defense mechanisms, guaranteeing its balance.

The key to this balance lies in the plant diversity of the garden, which ensures its biodiversity. Plant diversity includes the fruits and vegetables of the kitchen garden, the flowers, aromatic and medicinal plants integrated there, as well as the flowers, shrubs, and trees installed around its perimeter.

It is understood that the greater the biodiversity, the higher the populations of beneficial insects and the better the chances of achieving ecological balance. Controls then occur naturally without the intervention of the gardener.

Plant diversity also offers the advantage of disrupting the tracking system of harmful insects by creating visual and olfactory confusion. In this regard, strong-smelling plants like aromatic herbs are very effective, especially when placed in close association with vegetables.

Companion Planting, a Matter of Logic

Once the fundamentals of biodiversity are well understood, crops must be organized to maximize garden productivity. First, the rules of crop rotation, which take precedence over those of companion planting, must be applied.

While developing their garden plan according to the rules of rotation, one should attempt to apply these principles of association.

- Associate plants with similar requirements, which facilitates fertilization.

- Combine plants from different families, which helps create confusion in the vegetable garden by mixing colors and smells. Additionally, the associated vegetables do not compete with each other, as plants from different families have different nutritional needs.

- Marry plants of different vegetative forms, which also reduces competition among vegetables.

To complete the picture, companion plants must then be integrated into the garden. Aromatic and medicinal plants, as well as certain flowers, will be chosen and interspersed between plants, at the end of rows, or around the perimeter of the garden. Well-planned companion planting increases plant density, which creates complete plant cover and optimizes garden productivity. However, when plants are forced into too close proximity, it creates competition detrimental to yields and reduces air circulation, which is necessary for drying leaves after morning dew or rain. Prolonged humidity opens the way for the development of fungal diseases, a problem that is always better to prevent than to cure. Therefore, good air circulation throughout the vegetable garden must always be ensured. It's all a matter of balance.