The famous law Labbé, which prohibits, as from 1 January, the use of chemical pesticides for amateur gardeners, gives rise to various reactions. If the followers of the organic enjoy it loud and clear, the other, quite as numerous, but more discrete, wonder in silence. Everyone, indeed, does not (yet?) knowledge and, especially, the time necessary to struggle exclusively “natural” pests, in fact many more, that attack the plants of the gardens.

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How will react to, in effect, the “gardeners of the Sunday”, for which this activity is only a hobby (or a chore…) as another, when confronted with repeated attacks of parasites of all kinds, in the absence of effective means of protection, cheap and easy to implement? Will they continue to sow and to plant as many flowers in their garden? Mystery…

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Asters in bloom. 88759741/Jolanta Mayerberg – Fotolia

In the meantime to see more clearly, the good news is that there are “hard to cook” capable of withstanding all the “plagues” that come up. Their resilience, having no equal that their beauty and often their fragrance, there is still a way to create beautiful massive without too much of pimpernel! This is the case of the eschscholtzia, or California poppy, a indestructible to the brilliant corolla golden yellow that blooms all summer and will reseed itself like a large. The sages, who are comprised of more than 900 species (officinale, guarani, mellifera, involucre…), are also part of these plants can go happily to any treatment, chemical or organic. Just as the crocosmia, cousin, south african iris, which does not fear much, too, that the slugs and moles.

others, such as the ancolie, have the knack to get through the drops: susceptible to powdery mildew, this renonculacée between dormant when the disease appears at the end of the spring, so that damage is minimal. Except for neighboring plants it will be necessary to treat with sulfur, a fungicide that is stamped organic, but which only has a preventive action. Which means that it is ineffective once the fungus is installed… In the same family, the anemone of Japan, the asters and the coréopsis show respectable performances.

Roses tolerant

Side shrubs, the buddléia or tree with butterflies, fragrant daphnés, the althea, the orange tree of Mexico, the deutzia, forsythia, abélia, sage with small leaves ( Salvia microphylla ) and other values are safe. Ditto for the new roses rendered tolerant to the disease (marsonia, powdery mildew) thanks to the genetics and the long and patient work of their breeders. Reverse of the medal: many of the older varieties, are very sensitive, and now deprived of their protection, are likely to fall by the wayside. As elsewhere, the boxwood and the palm of the Canary islands. Victims of the borer and the cylindrocladiose for one, the red palm weevil to the other, these flagship species are fast disappearing from our gardens and those of the Côte d’azur. In the absence of significant progress in the development of biocontrol methods effective, particularly against diseases where the range remains largely insufficient, the list could well be longer…

Your appointment “garden” to do (mostly) not to be missed

• Until 11 march: 7th exhibition “a Thousand and one orchids’, a large greenhouse of the Jardin des Plantes, Paris.

• march 12: conference Day on the biocontrol organized by the SNHF “methods for gardening au natural”, Pa Toulouse, Castanet-Tolosan (Haute-Garonne).

Marion Duplessier/SNHF

• From 13 march to 12 April: Exhibition “Charles Lemaire and Edward Maubert, a common passion for botany”, the Headquarters of the national Society of horticulture of France (SNHF), Paris 7e.

• 14 march: Symposium “Boxwood, issues, renewal and renaissance gardens”, the conference centre, Orléans (Loiret).

• march 17: Day of hellébores, trilliums and shrubs, winter Gardens, Berville, La Genevraye (Seine-et-Marne).

• 20 march: “Seed to plant: what are the stakes for our future?” MOOCS organised by the Groupement national interprofessionnel des semences (Gnis) and Agrocampus-ouest. Registration is open (click here).

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

• 23 and 24 march: 17th-celebration of plants organized by the Rotary Club Blois Sologne, in the park of the château de Cheverny (Loir-et-Cher)

• 29, 30 and 31 march: international Competition of floral art, “Elegance floral”, salle Claude Nougaro, Revel (Haute-Garonne).

• Until 30 march: Sessions “to Create and organize my garden” and “Good seed, good planting: the success of my crops,” proposed in France by the association Jardinot.

• 30-31 march: Week-end “Seeds of solidarity” in Truffaut, at the initiative of the Foundation Georges Truffaut.

• From march 30 to April 28: “Dreams of the Mediterranean”, 2nd edition of the Festival of the Gardens of the Côte d’azur, with contest of creations landscape ephemeral on different sites of the Alpes-Maritimes.

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