Should we banish the term “weeds” as the advocate for some of the purists? If, obviously, no plant is not in itself bad, some are none the less highly undesirable since they call in the middle of salads, flower beds or driveways gravel. Chestnuts, thistles, sorrel, wild chiendents, ranunculus, “grass to the gouty,” are among the most invasive.

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These perennials, as they are called, have the major drawback of constantly push. A little in the way of the hydra of Lerne, whose multiple heads régénéraient as they are cut. Their roots are very deep (up to one meter for the buckwheat!) and their ability to be reborn from a piece of root or stem explain their incredible vitality.

Burn out the unwanted

The weed killers are systemic, such as glyphosate or 2,4-D allowed so far to control the good and the bad. In particular on the non-cultivated: courtyards, terraces, walkways. But their prohibition now requires gardeners to resort to other methods, certainly more “natural” but more time-consuming and it’s not going to lie – less and less efficient.

one of them is to burn unwanted. Either with a désherbeur thermal (electric or gas), or by spraying a herbicide bio contact-based fatty acids, corrosive substances extracted from plants such as geranium, which kill the plant cells by exposing them to the sun’s UV rays, either with the cooking water that we recycle in ébouillantant plants to eliminate rather than throw it in the sink.

immediate Effect of The acid pélargonique, secreted by the geranium, is a herbicide “natural”. Nicolette Wollentin/Nicolette Wollentin – Fotolia

Advantage of the new herbicides bios: the effect is immediate, subject to thoroughly wet the foliage and apply the product in the hottest hours of the day. In all cases, the weed, the less their stalks and their leaves, burn out in a few hours. But if the seedling trépassent, the elderly and, in particular, the famous perennial of which the unit root remains intact, were quick to push back. This requires practice, depending on the weather, 2 to 4 passages (if the summer is hot and humid) instead of with herbicides “chemical”, also five to thirty times less expensive. In this regard, the mixtures of white vinegar and coarse salt cooking advocated here or there, are to be avoided because of their toxicity to the soil and the environment, even if their price challenge, of course, any competition. As for the désherbeurs heat, they consume a lot of energy and those that work at the gas gives off CO2. However, electric models such as the Green Power Berthoud which is plugged on the mains, have the advantage of being practical, safe and well suited to small gardens, for a reasonable purchase price (89,90 €).

One supplement with hoeing repeated operation is also beneficial for the soil and crops (aeration, reduction of evaporation, etc.). At long last, these, claws, teeth, or blades, are going to deplete the plants more resilient by forcing them to continually renew their stems and their leaves, and preventing them, at the same time, to replenish their supplies of sugar. But, for the gardener, beware of the bad back! Especially when it comes to scratching of tiles and paved courtyards…

see also: The (mini) revolution of herbicides “bio”

By depriving them of light, the mulch prevents weed seeds from rising. 65242049/hcast – stock.adobe.com

fortunately, new tools are appearing on the market, as it is shown in the video attached to this article. This is the case of désherbeurs manuals that allow you to remove plants with taproots (sorrel, wild thistle, dandelion) without having to bend down. Jean-Marc Muller, president of the section “vegetable gardens and fruit” of the SNHF, a partner in the Figaro , cleaning up her spine by sitting on a small seat when it lightens and weeds to the hand of its young seedlings.

Disappearance of selective herbicides

Other technical extra, mulching which consists in depositing a layer of dead leaves and other plant products (miscanthus, straw hemp, buckwheat hulls, cereal straw, bark…) or even old rugs wool or coco coir, is used to maintain the soil once watered. Deprived of light, the seed side are unable to germinate. Only the perennial (yet!) as the chestnuts and thistles manage to pass through…

With the complete disappearance of selective herbicides, these changes will also seriously complicate the care of lawns. “Pending the arrival, for the moment hypothetical, molecules, systemic bio, manual uprooting but also the correct setting of the cutting height, fertilization, overseeding of “holes” by ressemis systematic, should encourage grasses at the expense of their competitors,” explains Nicolas Marquet, director-general of the Union of companies for the protection of gardens and Public spaces (UPJ). a hope may be: French researchers have recently highlighted the virtues of herbicides of the radulanine, natural substance extracted from a certain type of foam. But it will be years before the development of a possible specialty commercial.

• This article is an updated version of that published on 17 may 2018.

On your agenda: rendez-vous “garden” not to be missed

• Until may 31: the Training offered in several cities in France by the association Jardinot on themes “companion Plants, crop rotation, hedgerows varied…” and “weeding without chemicals, it is possible!”.

• Until may 31: 5th photo contest epidemiological surveillance 2019, organized by the SNHF on the theme of “Webs, cocoons and filaments”. Award ceremony on 14 June.

Marianne Seguin and Co.

• 1 and 2 June: 26th feast of gardeners and 20th winners of the book award of garden P. J. Dreaded, chateau of Lude (Sarthe).

• 6 to 9 June: 16th rendez-vous “Gardens, Garden”, parc des Tuileries, Paris.

• 7, 8 and 9 June: 17th edition of the “Rendez-vous in the gardens”, organised under 3000 gardens of France and Europe by the ministry of Culture on the theme of “animals in the garden”.

• From 7 to 10 June: 19th “Day of pink” sponsored by Stéphan Bern, abbaye royale de Chaalis, Fontaine-

Chaalis (Oise).

• 8-9 June: 11th day of botanical “green” future, alpine botanical garden of the Jaÿsinia, Samoëns (Haute-Savoie).

• 8-9 June: 7th Weekend “the rose”, parc de Bagatelle, Bois de Boulogne, Paris 16th.

• Up to June 9: annual opening of the conservatory of the peony, all the days of 12 h to 18 h, except Wednesday, chateau de Sourches, Saint-Symphorien (Sarthe).

Marianne Seguin & cie

• 11 June: Sale of cacti and succulents at prices very attractive to the SNHF, 84 rue de Grenelle, Paris 7th, from 17h.

• 14, 15 and 16 June: Feast of the creation and of the métiers d’art, Château de Saint-Jean-de-Beauregard (Essonne).

• Until 30 June: please Send your application to the national Competition of gardens in 2019, by clicking here.

• Until 8 September: Exhibition “the Gardens, the joys of Val d’oise”, the House of Doctor Gachet, Auvers-sur-Oise (Val d’oise).

• Up to 6 October: Exhibition “Arte Botanica” performed by 15 artists, including Rebecca Louis Law, Domaine départemental de La Roche-Jagu, Ploëzal (Côtes d’armor).

• Up to 13 October: Exhibition of sculpture “after nature” by Marc Didou, domaine de Trevarez, Saint-Goazec, (Finistère, brittany).

• Until October 15: Exhibition of 60 sculptures of Stone Treilhes in the Gardens of Eyrignac in Dordogne.

• Until 3 November: the 28th edition of the international garden festival on the theme of “Gardens of paradise”, the Domain of Chaumont-sur-Loire (Loir-et-Cher).

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