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Garlic decoction, technique and timing

Garlic and clove on a countertop with a dark background, still life
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Half a kilo of crushed cloves, left to soak overnight and then boiled for a quarter of an hour, makes five litres of home-made treatment. Sprayed on the leaves and poured at the foot of the plant, this garlic decoction tackles blight, rust, peach leaf curl and aphids — provided you use it fresh, since it does not keep.

You can use it all year long, but spring is when it makes most sense when such diseases are in full swing.

Recipe for 5 quarts (5 liters) of garlic decoction

  • Peel and chop or crush 1 lbs (500 g) garlic cloves.
  • Macerate around 10 to 12 hours in 5 quarts (liters) water.
  • Bring this preparation to boiling and let boil about 15 minutes.
  • Cool.
  • Spray directly on leaves and water the foot of the plants and vegetables.
  • Renew this entire procedure 2 to 3 times with a 3-day interval.

This decoction is used a lot in the vegetable patch and on fruit trees but all your plants can be treated this way.

The four stages of the preparation at a glance

The whole treatment is really four simple stages, each with its own timing. Use the table to check where you are before moving on to the next one.

The four stages of the preparation at a glance
Stage What to do How long
Maceration Peel, chop or crush the cloves and leave them to soak in the water 10 to 12 hours
Boiling Bring the whole preparation to the boil About 15 minutes
Applying Spray the leaves and water the base of the plants and vegetables Once the liquid has cooled
Repeating Run through the entire procedure again, 2 to 3 times in all 3 days between treatments

Five litres is enough for a small vegetable patch and a few fruit trees in one go.

Garlic decoction is especially effective against

This preparation doesn’t keep, so if you have any left, feel free to use it for the rest of your plants because it can only help!

  • Read also our page describing how to grow garlic.

Written by Gaspard Lorthiois | Loves helping out, especially when it comes to growing things. Worked in herbal medicine, runs a farm, and dabbles in tech. Master's degree and engineer.

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