Yeast promotes the activity of beneficial microorganisms in the soil. Healthy soil is the basis for healthy plants.
Application: The same yeast solution as above can also be poured directly into the garden soil, especially around plants that need a nutrient boost.
Use: This improves soil structure, increases the availability of nutrients to plants, and can even help suppress the growth of mold.

Yeast as a Compost Accelerator
Would you like to turn your compost heap into valuable humus faster? Yeast can help here too!
Use: Mix a yeast solution (as described for plant watering) with the compost material.
Use: The yeast accelerates the decomposition process of the organic matter in the compost heap, causing it to mature faster.

Yeast Against Pests and Diseases (Indirect)
Although yeast is not a direct pesticide, healthy, vigorous plants strengthened by yeast can be more resistant to disease and pest infestation.
Strengthening Plants: A well-nourished plant with a strong immune system is less susceptible to attack.
Important Notes:

Moderation is important: Although yeast can be beneficial, “more is better” is not the motto here. An overdose can disrupt the soil’s balance.
Fresh yeast is preferred: Baker’s yeast (fresh or dry) is best. Brewer’s yeast has a different composition.
Not for all plants: Some gardeners report that certain plants, such as tomatoes or peppers, respond particularly well to yeast, while others (e.g., some acid-loving plants) may benefit less.
Combination with other fertilizers: Yeast is not a substitute for full-fledged fertilizer, but rather a kind of “booster” or soil conditioner.
It’s fascinating to see how simple household remedies like yeast can be used in so many different ways in the garden to strengthen plants and promote soil health. A truly undervalued resource in every household!

Have you had any experience with yeast in the garden?