Compost Tea Info

Tea for Plants / Tea for the Planet

nourish your earth, plant and people


What is Compost Tea?

Much like herbal teas, compost tea can simply be described as a water extraction of compost; compost soaked in water to extract the many beneficial nutrients and more importantly the diverse micro-biology present in good quality compost.  Once suspended into a liquid solution, the beneficial organisms in the liquid compost can easily be applied to soil, turf, leaf surfaces, compost heaps, ponds or other natural systems.

Why Compost Tea?

  "The point of applying compost tea is to return the biology that should be present, to grow the desired plants with as little effort as possible.  There can be no question that presence of beneficial organisms improves plant growth" -Dr. Elaine Ingham et al, 1985, USDA Soil Biology Primer, 1995.  Dr. Elaine Ingham has been a leading researcher and authority on the subject of compost tea, working to identify target organisms necessary for healthy agricultural and ecological systems. 

  Home brewed compost teas are very affordable and serve as a living fertilizer, working extremely well in building a productive and healthy soil ecosystem.  In addition, compost teas provide a healthy alternative to toxic chemical fertilizers and can be used on lawns, vegetable gardens, annuals, perennials, houseplants, shrubs, trees, orchards, forests, and vineyards with no threat to pets, livestock or humans.

What does Compost Tea Do?

  Compost tea and compost extracts act as a probiotic for your soil.  Digestive health is essential for the proper conversion and absorption of nutrients from our diet.  Much like within our digestive tract, it is a diversity of key organisms within the soil that aid in the digestion or decomposition of organic matter and the conversion of nutrients into forms readily available to plants.  The collective biology at work in soil is responsible for building humus and soil structure, assisting with water and nutrient retention, as well as the recycling and mining of nutrients and minerals.  Compost extracts and actively aerated compost teas can improve the digestive health of your soils by inoculating them with billions of beneficial microbes.  

  Building a diverse soil ecosystem teeming with life will help to improve the health and productivity of your farm and gardens.  Specific organisms (fungi, bacteria, protozoa, nematodes, etc.) present in mature biologically active compost have been identified to aid in plant health and the suppression disease.  Diverse biologically active soil and plant tissue has the capacity to form a protective barrier from disease and pests throughout a plants root and leaf zones thus out competing pathogens and parasitic organisms for food resources.  

  "The problem in agriculture has not been a lack of nutrients, but a lack of the proper biology to make those nutrients available to plants." -Dr. Elaine Ingham, Soil Foodweb, Inc. 

What is the difference between compost tea, compost extract, and actively aerated compost teas (AACT)?

  The term compost tea is used, broadly at times, to describe a variety of liquid compost and mineral solutions.  Ideally, compost tea should be a cultured biologically active liquid compost possessing a full-diversity of the biology present in compost.   

  Compost extracts can be made in minutes and applied immediately, making them very convenient if there is not enough time to brew aerated tea.  Compost extracts will provide a similar concentration of the microbes found in your starter compost. You can use compost extracts as a soil drench, root dip when transplanting or to inoculate; compost heaps, potting and planting mixtures.

  Actively Aerated Compost Tea (AACT) is a water extraction of compost using high volumes of oxygen, thus maintaining a highly aerobic environment and a more precise cultivation and extraction of the beneficial organisms present in the compost.  Aerated compost teas can be fed specific ingredients to cultivate select microbial life present in the mature compost.  The increased oxygen levels and select foods added to aerated compost tea act as a catalyst feeding the diversity of organisms into an accelerated growth.  Actively aerated compost tea can be applied as either a soil drench or as a foliage spray.

For further reading on brewing and working with compost tea we recommend the following books. 

The Compost Tea Brewing Manual - by: Dr. Elaine Ingham

Further info on Compost Tea

The links below will take you to studies, stories and other sites with great information on the use and effects of compost teas.

- "The Soil Biology Primer" from the USDA Natural Resource Conservation Service

- Soil Foodweb Inc. - This is Dr. Elaine Ingham's website and maybe the resource on compost tea.

- Microbe Organics This site is operated by Tim Wilson and covers microscopy of compost teas. He has a DVD available that show the different beneficial microorganisms in compost teas and compost, as well as a uniquely designed commercial tea brewing systems.

- Gardening with Microbes

     Here are some great articles from the folks at Gardening with Microbes

Additional Compost Tea

- "Organic brew puts green back into Yard" from the Harvard University Gazette

"Compost Tea and Milk to Suppress Powdery Mildew (Podosphaera xanthii) on Pumpkins" from the University of Connecticut

- "COMPOST TEA TO SUPPRESS PLANT DISEASE"  by Vern Grubinger  Vegetable and Berry Specialist  University of Vermont Extension