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Using tea leaves to enhance plant growthFeatured science projectScience project video


This science fair project was done to find out the effect of using tea leaves as fertilizer for enhancing plant growth. Testing was done using the rose plant planted in soil mixed with tea leaves.


Rose plants planted in soil containing tea leaves, grow more quickly.

Scientific Terms

Compost, nutrients, disease, potassium


Tea leaves as fertilizer

Used tea leaves can be very beneficial to indoor and outdoor household plants. The compost helps to concentrate nutrients and beneficial bacteria in liquid form, for the plant’s roots to absorb them more easily. They also help to prevent soil borne diseases and provide the leaves of the plant with a protective coating.

Tea compost is slightly acidic and can be used to neutralize basic soil. It can also be used to make the soil acidic for plants that require soil with lower pH levels. The caffeine found in tea leaves is also believed to enhance plant growth. Tea is also rich in potassium, which is an important nutrient for plant growth.

Tea leaves have also been found to be beneficial to mushroom growth. By using a ratio of 1:1 for tea leaves and peat, the growth of mushrooms can be hastened. This will help to reduce the need for cutting down trees in order to effectively grow mushrooms.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 28 days for science fair project
Material availability:
Easily found at a plant nursery
Safety concerns:

Basic safety requirements