Fermented tea, maceration, infusion, decoction… garden tansy sure shares many benefits! Pest repellent and fungicide, it’s also an interesting flower that fosters biodiversity.
An attractive and repulsive plant
Some insects flee it, while others love to nestle right in its center. Flies, slugs, codling moth, ants and aphids hate it. On the other hand, wasps and predator wasps, ladybugs and hoverflies love it for the pollen and nourishment it offers. It is even noted to inhibit the laying of eggs and feeding of larvae for some insect species that typically cause heavy damage in the vegetable patch, such as the colorado potato beetle and the cabbage moth.
How to use tansy in the garden and vegetable patch?
Fermented tansy tea
First step in preparing a fermented extract is to harvest your tansy! You’ll need about 1 pound fresh material for 5 quarts water (more or less 1 kg for 10 liters). If you use dried material, divide the amount by ten: 1½ oz for 5 quarts, or 100g for 10 l. Save yourself the hassle of filtering what will become a stenchy mix by stashing this plant material in a cloth bag or fine mesh sack. Dunk the bag into a container with the 5 quarts or 10 l water. Every day, stir with a stick. As soon as the mix has stopped bubbling, it’s ready. Pour your fermented tea in bottles and store these away from light. Take note that, as such, the mix is concentrated: you have to thin it to a 5 or 10% mix before spraying (1 volume mix plus 9 or 19 volumes water). This spray is excellent when used as a preventive treatment to repel vegetable patch pests and keep rust and mildew from appearing.
Boil a quart or liter of rainwater, and chop up about 10 ounces (300g) of tansy. Use the whole plant: stem, roots, leaves, flowers (if any). Place the tansy in a non-metal bowl or container and cover with the boiling water. Cover it over and let it steep an entire day. Filter your infusion and transfer it to a bottle for storage and keeping. Dilute it 1:9 (10%) before use. Excellent to repel ants, owlet moths, flies and sawflies.
You’ll need 1 ounce of dried flowers (30g), equivalent to around 10 oz of fresh flowers (300g). Dice them up finely and steep them in a quart or liter rainwater. Let the mix macerate outdoors in full sun for three days, then filter and bottle it. Use this preparation directly (no need to dilute it) against rust and mildew.
Benefits for man and animal
- An infusion will alleviate the pain in painful menstruation, ease digestion, and for animals serves as a vermifuge.
- A poultice will soothe contusions.
- Mite repellent
- Essential oil has anti-inflammatory, anti-histaminic and anti-oxidant activity.
Follow recommended doses for each particular use: since tansy contains thujone, a toxic compound, mistakes can be dangerous. When the dosage is small, tansy is beneficial. When doses are too high, or the plant is taken too often, it becomes toxic and even triggers miscarriages. Definitely not a plant extract for pregnant women!
Convinced yet? Wouldn’t it be a great idea to have a little tansy at hand? At the very least, pollinators will consider the camphor-scented blooming a real treat! It is a very easy plant to grow, as long as drainage is good. It’ll thrive in poor, and even chalky soil. It does prefer cool soil, and doesn’t really like excess acidity. Better place it in sun or part shade, either in containers or directly in the ground.
Planting is most successful in Spring and Fall, and spacing should be at least 30 inches (50 cm) between plants. If growing in a pot, layer the bottom of the pot with clay marbles for drainage. Outside in the ground, water only upon planting, and then again in case of prolonged dry spells.
When to harvest tansy?
Harvest leaves in May-June: cut the entire stem with the leaves still attached. Harvest flowers in September. In Autumn, cut the plant back to a short clump, and you’ll see it bounce back to life in Spring. You can use it fresh, direct from the plant, or you can dry it by hanging a bouquet upside-down.
Dreamy tansy by L.C. Nøttaasen under © CC BY 2.0
Tansy with leaves by Donald Macauley under © CC BY-SA 2.0
Macerated tansy by solylunafamilia under © CC BY 2.0
Dried and chopped tansy by Richard Woffenden under © CC BY 2.0
Bouquet for drying by Maja Dumat under © CC BY 2.0