Liquid manure, maceration, infusion, decoction… Tansy in the garden has many virtues! Repellent and fungicidal, it is nonetheless an interesting flower for biodiversity.
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A repellent and attractive plant
Some insects run away from it while others come to nest there. Flies, slugs, carpocapses, ants and aphids dread it. Conversely, wasps, ladybugs and hoverflies cheerfully come to forage. It would even make it possible to limit the laying and feeding of the larvae of certain insects, which wreak havoc in the vegetable patch, such as the Colorado beetles and pimples.
How to use tansy in the garden and vegetable patch?
To prepare a fermented tansy extract, you have to start with the picking! You will need a kilo of fresh plant or 100g of dry plant for 10L of water. To avoid having to filter, place the stems, flowers and leaves in a cloth or fine mesh bag. Put it in the container containing the 10L of rainwater. Stir with a stick daily. As soon as the preparation stops bubbling up during mixing, it is ready. Then pour your liquid manure into bottles and store them out of the light. Be careful, liquid manure is a concentrate, consider diluting it to 5% or 10% for spraying. This solution is used in prevention to keep pests away from the garden and prevent the appearance of rust and mildew.
Boil a liter of rainwater, then collect 300g of tansy (the whole plant) that you chop into small pieces. Place the tansy in a (non-metallic) container covered with boiling water. Cover and let steep for a day. Filter your infusion by bottling it before using it diluted at 10%. Use it for prevention against ants, moths, flies and hoplocampus.
In flower maceration:
You will need 30g of dried flowers, which makes a harvest of approximately 300g of fresh flowers. Chop them finely and soak them in a liter of rainwater. Leave to macerate in the sun for three days before filtering and bottling. Use this undiluted preparation for preventive rust and mildew control.
Its benefits for humans and animals
- Infusion against painful periods, to facilitate digestion and dewormer for animals
- Poultice to relieve bruises
- Moth repellent
- Essential oil with anti-inflammatory, antihistamine and antioxidant properties
Warning: Follow the dosages indicated for any use because tansy contains thujone, a toxic substance. Used in small doses, it lavishes its benefits. In large quantities or too frequently it becomes toxic and even abortive. To be avoided for pregnant women therefore!
With all these virtues, it’s fashionable to have tansy on hand, right? In addition, pollinating insects will enjoy its camphor-scented flowers. Easy to grow, it grows in any type of drained soil, even poor or limestone. This perennial, however, prefers cool soils and dreads acidic soils. Instead, place it in the sun or partial shade, in a pot or in the ground.
Planting takes place in spring or fall, with a 50cm spacing between each. In pots, remember to drain the bottom of the container well with clay balls. In the ground, water only when planting or in the case of prolonged droughts.
When to harvest tansy?
The leaves are harvested in May-June by cutting whole stems lined with foliage. As for the flowers, the harvest takes place in September. In the fall, then cut the tuft close to the ground, it will start again in the spring. You can use it fresh or dry it by hanging a bouquet upside down.