Use coffee grounds for cannabis, weed & autoflower plants?
You literally don’t have to buy inorganic cannabis fertilizer if you can access some coffee grounds. If, for instance, you visit a coffee shop, you will notice that some shopkeepers throw these grounds into the bin or give them away for free.
Did you know that taking them to be used in your marijuana garden will be doing your pot plants with a critical service? Indirectly save that shopkeeper the amount they would use to pay for garbage collection by carrying those grounds with you. It is a win-win situation for the two of you, anyway!
While some people may think that coffee grounds could be inefficient or even harmful to pot plants, we would like to clarify that it is beneficial to use coffee grounds as a cannabis fertilizer for the top reasons mentioned below.
1. Coffee grounds are nutritious for worms
Worms are vital organisms in a cannabis garden's ecosystem. Picture this: your grass plants need the production of compost for the best survival. When you keep coffee grounds to feed the compost-making worms, that would be referred to as vermiculture / vermicomposting.
So, yes, coffee grounds are good for enhancing vermiculture. Of course, well-fed worms will end up adding more organic supplements to the cannabis garden through their poops, and castings.
2. Balancing acidity in a cannabis garden
Coffee grounds add acidity to soil, especially when they mix with compost. As you learn about the best pH for cultivating cannabis plants, then you will realize that these plants do well when the pH levels reach closer to the acidic scale.
Is coffee good for cannabis? Definitely. Coffee grounds boost the acidity in the soil in which cannabis plants get planted, and thus, help in raising the pH of those plants.
Essentially, when the soil has low acidity levels like let’s say below 5.0 pH levels, then the growth of flourished ganja plants will get inhibited. Now that these grounds are natural, there is no worry about exposing the soil environment to high alkalinity levels. In fact, you can’t be wrong to say that coffee grounds act as a pH-down product.
3. Preventing pest infestation
Pests are a great nuisance to cannabis plants. Fortunately, coffee grounds for plants work pretty well. As mentioned above, coffee grounds boost acidity. Most cannabis-attacking pests tend to not put up with acidic nutrients, thus, they may be forced to shun attacking the main plant.
The other benefit of coffee grounds in handling pest control is the abrasive material forming on the edges of those grounds. These materials could be so sharp that they will end up hurting those pests or forcing them to change their path further away from their targeted pot plant.
The same case applies to fighting cannabis fungal threats like Pythium, Sclerotinia, and Fusarium.
4. Coffee compost for cannabis
Coffee grounds for plants harbor essential nutrients that help in making coffee compost and grass plants vibrant. When you add coffee grounds to a compost bin, they firstly serve as green waste.
As we know, when green waste gets mixed with other wastes like wood ash and other carbon-rich materials, a lot of heat gets produced. This heat, therefore, breaks down all those materials to form a potent compost for cannabis.
Now that coffee grounds also have high nitrogen levels, these levels get broken down and are present in the compost mix. This nitrogen will play a critical role in greening the leaves of pot plants and making them as vibrant as their true definition could be!
Also, nitrogen will help the plants to yield more leaves, which will be essential for survival and during photosynthesis.
5. A source of nutrients
The whole idea of using cannabis fertilizers revolves around ensuring that those plants receive adequate nutrients. In addition to nitrogen, coffee grounds for cannabis plants help in giving other nutrients like magnesium and potassium.
Frequently asked questions
Are coffee grounds good for plants?
Coffee grounds are good for plants since they contain various nutrients such as Magnesium, Calcium, Nitrogen, Iron, Potassium, and Phosphorus. Additionally, it is easy to apply coffee grounds to plants, which boosts acidity in soil and absorbs unhelpful metallic elements from the soil. You can’t be wrong to use coffee grounds to improve soil fertility.
What are coffee grounds good for?
Coffee grounds are good to use as a fertilizer since they add organic matter to the soil. They also improve aeration, water drainage, and water retention. In this combination, microorganisms such as earthworms thrive much better. These organisms are beneficial to the overall growth of the plant as they keep helping with the decomposition of organic nutrients.
How long are coffee grounds good for?
Coffee grounds are good in soil for up to 3 months. However, you will need to rake them in the soil so that microorganisms such as earthworms can help with efficient decomposition. After those 3 months, most of the beneficial nutrients will have been converted into helpful organic fertilizer.