Growing Autoflowering Cannabis Plants Using Organic Fertilizers

Growing autoflowering Cannabis plants, from seed to harvest, organic nutrients and what to consider.
08 May 2020
4 min read
Growing Autoflowering Cannabis Plants Using Organic Fertilizers

  • 1. From seed to harvest
  • 2. What nutrients do autos need?
  • 2. a. Primary nutrients
  • 2. b. Secondary nutrients
  • 2. c. Trace elements
  • 3. Organic nutrients for cannabis plants
  • 4. Organic boosters for flowering
  • 4. a. Phosphorus
  • 4. b. Potassium
  • 4. c. Molasses based nutrients
  • 5. Bat guano
  • 6. What about flushing with organics?
  • 7. In conclusion

There is nothing more rewarding than growing your very own organic medicine, in the comfort of your own home. If you are planting indoor or outdoors, using organic nutrients is a green and eco-friendly way to grow your own medicine.

In this article, we explain all about growing autoflowering Cannabis using organic methods, boosters for the growing and flowering stages, and the importance of flushing.

1. From Seed To Harvest

Autoflowering Cannabis plants have the ability to be planted and harvested between 9-10 weeks. Regardless of the amount of lighting the plants receive, they will begin to start flowering after a 21-day period.


Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Growing Cannabis From Seed to Harvest

Growing cannabis from seed to harvest.

From this point onwards, the plants will focus on transitioning into flower, meaning they will stretch in height and start to produce resin-coated buds.

2. What Nutrients Do Autos Need?

Primary Nutrients

These consist of the three main nutrients an autoflowering Cannabis plant will use during its lifecycle. Nitrogen, Phosphorus, and Potassium are essential in the development of root growth, stem, leaf, and flower production. These are responsible for the production of hormones, proteins, vitamins, and chlorophyll production.


Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Organic Boosters For Flowering (NPK)

Make sure your plant always gets enough Nitrogen (N), phosphorus (P), and potassium (K) on its vegetative stage.

Secondary Nutrients

Magnesium, Sulphur, and Calcium are classed as secondary nutrients and will be used in combination with primary nutrients and trace elements. They are very important and play a huge role in the metabolism and cell function of Cannabis plants.

Trace Elements

These are essential to the balance of the plant health and should be used in conjunction with primary and secondary nutrients.

3. Organic Nutrients For Cannabis Plants

If you have chosen to buy the nutrients and soil from an existing brand, then you will have everything that you need between the soil, and bottled nutrients to cover the plant’s requirements. For beginner growers, following an organic feeding chart is an excellent way to grow Cannabis plants, without the need for any advanced skill level.

For those who wish to take organic growing to another level, using living soils, homemade compost and worm castings and aerated compost tea will allow Cannabis plants to grow with incredible vigor, plant health, and with a superb resistance, as well as enhancing the flavor and aroma of the flower even further.

4. Organic Boosters For Flowering

As the flowering period of an autoflowering cultivar can last from 6-7 weeks, it is important to supplement the plants with higher amounts of Phosphorus and Potassium than before. Nitrogen is not as essential and can be cut out during the final half of the blooming period. 


Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Phosphorus

Phosphorus is the most used nutrient by autoflowering Cannabis plants.

•  Used for root development and flower production.

•  Aids in energy transfer and photosynthesis.

•  Necessary for resin production.

•  Essential for seed production. 


Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Potassium

Potassium encourages strong root growth and development.

•  Responsible for combining starches and carbohydrates.

•  Aids in chlorophyll production.

•  Helps regulate the stomata function responsible for CO2. 

•  Increases oil content and flavor profile.

Molasses Based Nutrients

Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Molasses Based Nutrients

Unsulphured blackstrap molasses are extremely rich in minerals and have very high sugar content.

•  These will be thick and dense with a dark brown, caramel shiny appearance.

•  Packed full of minerals and rich in Potassium.

•  A rich source of sugar for the microbial soil life.

•  Used normally to add weight to the plants during flowering. 

5. Bat Guano

A very popular choice for growers who are aware of the benefits associated with using bat guano in power form, as a pre-made extract or in the form of an aerated tea. Nutrient companies will source their guano from all over the world ranging from Indonesia, Jamaica, Spain, and many other places.

Depending on the diet and where the bats are located, and the time the dried guano is harvested the bat caves can determine the N-P-K value. Normally bat guano is high in Phosphorus and will act as an excellent nutrient to feed plants during the blooming period.


Growing Autoflowering Cannabis Plants Using Organic Fertilizers: Bat Guano

Bat guano is an excellent way to supercharge living soil.

The Benefits Associated

•  Flavor is dramatically enhanced.

•  Bat guano is rich in enzymes and beneficial bacteria.

•  Can be used in powder form and mixed into a growing medium.

•  Aerated bat guano teas are superb for stimulating flower production.

•  The aroma and terpene production will become more advanced.

6. What About Flushing With Organics?

If you have been using any type of nutrients apart from watering soil, then you will need to flush your autoflowering plants. One of the main reasons is to encourage your flowering ladies to push and use up all of their internal reserves, and the other is to flush out your growing medium.

Over the 10-week period, there will have been lots of nutrient solution in the form of undissolved salt minerals that need to be cleanly removed. Water is essentially a solvent and by using only pH-adjusted water, for the final 14 days prior to the harvest date then you will have cleaned out the growing medium, and encouraged a final growth spurt from your plants.

7. In Conclusion

Growing Cannabis using organic methods is a great way to learn about how autoflowering plants grow, the ideal watering frequency, and to obtain the best flavor possible.

Follow simple instructions and in some cases simply add only water, Autoflowering cultivars are so resilient and can adapt well to any climate, so provide them with the ultimate organic nutrition and they will do the rest for you.

08 May 2020