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Best Soil for Autoflowers

The best soil for autoflowers is a well-draining, nutrient-rich soil mix that contains a blend of peat moss, perlite, and vermiculite. Autoflowers prefer a slightly acidic soil pH between 6.0 and 7.0, and a good quality soil mix will provide the necessary nutrients for healthy growth and abundant yields. It is also recommended to supplement the soil with organic fertilizers to provide additional nutrition for the plants throughout their growth cycle.


Soil Amendments for Autoflowers

For autoflowering plants, it is best to use organic fertilizers that provide a balanced ratio of nitrogen, phosphorus, and potassium, along with trace elements such as iron, magnesium, and sulfur. Some good options include:

  1. Compost: A homemade blend of decomposed plant material and organic matter that provides a balanced source of nutrients.
  2. Worm castings: Rich in nitrogen, phosphorus, and potassium, as well as micronutrients and beneficial bacteria.
  3. Bat guano: A high-nitrogen fertilizer that promotes leafy growth.
  4. Seaweed extract: A natural source of plant hormones, vitamins, and minerals.
  5. Blood meal: A slow-release nitrogen fertilizer that provides a quick boost of growth.

It is important to follow the recommended application rates on the product labels and to test the soil regularly to ensure it has the correct nutrient balance for your plants.

A simple recipe for a Super Soil for Autoflowers:


  1. 2 parts good quality garden soil
  2. 2 parts perlite or vermiculite
  3. 1 part compost
  4. 1 part well-rotted manure
  5. 1 part worm castings
  6. 2 tablespoons of dolomite lime (to adjust pH)
  7. 1 tablespoon of bone meal (for phosphorus)
  8. 1 tablespoon of kelp meal (for trace minerals)


  1. Mix all of the ingredients together thoroughly.
  2. Fill your containers or raised beds with the super soil mixture.
  3. Plant your autoflowering seeds or seedlings and water them well.
  4. As the plants grow, you can add more compost or worm castings as a top dressing to provide additional nutrients.
  5. Check the pH regularly and adjust as needed to maintain a range of 6.0 to 7.0, which is ideal for most autoflowering plants.

Note: This recipe is a general guide and you may need to adjust the proportions based on the specific needs of your plants and the soil conditions in your area.

Coco Coir as a medium – Organic Recipe for Autoflowers

coco coir-based growing medium for autoflowering plants:


  1. 3 parts coco coir
  2. 2 parts perlite
  3. 1 part vermiculite
  4. 1 part worm castings
  5. 1/2 part compost
  6. 1/4 cup of dolomite lime (to adjust pH)
  7. 1/4 cup of bone meal (for phosphorus)
  8. 1/4 cup of kelp meal (for trace minerals)


  1. Rinse the coco coir to remove any salt buildup and soak it in water until it is fully hydrated.
  2. Mix all of the ingredients together thoroughly.
  3. Fill your containers with the growing medium and plant your autoflowering seeds or seedlings.
  4. Water your plants well and adjust the pH to a range of 5.5 to 6.5, which is ideal for plants grown in coco coir.
  5. As the plants grow, you can add more worm castings or compost tea to provide additional nutrients.