Fermenting Your Own Plant Juice Fertilizer (FPJ) for Cannabis

What Is Fermented Plant Juice?

Alright, let’s start with the basics! Fermented Plant Juice (FPJ) is basically a natural plant food made from fermenting the juices of young, healthy plants. The idea is simple: use the energy and nutrients from vigorous plants to nourish your cannabis. Imagine it as a kind of magic potion for your plants, made entirely from other plants.
FPJ is made by fermenting plant materials like fresh leaves, fruits, or shoots with sugar. The fermentation breaks down the nutrients and makes them easier for your cannabis to absorb. Essentially, FPJ is packed with all the goodness your cannabis plants need to grow healthy and strong.
So, if you’re thinking, “Can I make my cannabis grow better with something homemade?” Well, FPJ might be the answer!
History Of Fermented Plant Juice
FPJ has its roots in ancient farming practices from regions like Korea and Japan. Farmers have been using it for generations in natural farming to boost plant health and yield. The Korean Natural Farming (KNF) method, created by Master Cho Han Kyu, helped popularize FPJ around the world. This practice isn’t new; it’s tried, tested, and trusted by farmers everywhere who want to use nature to help nature.

In recent years, this method has gained popularity among cannabis growers. As more folks lean toward organic growing and away from synthetic fertilizers, FPJ has become a favorite. It’s sustainable, organic, and super cost-effective—no wonder it’s becoming such a big deal.
Homemade Fermented Plant Juice

Making FPJ at home isn’t just rewarding, it’s also super practical for cannabis growers. You don’t need fancy chemicals or costly ingredients. You just need a few supplies, a little time, and some dedication. Plus, making your own fertilizer means you know exactly what goes into it—no nasty surprises for your plants or the planet.
It’s almost like cooking a good meal—when you prepare it yourself, it always tastes better, right? Well, when you make FPJ, your cannabis will “taste” the difference too.
Benefits Of Homemade Fermented Plant Juice For Cannabis
1. Nutrient Boost

FPJ is packed with nutrients like nitrogen, potassium, calcium, and enzymes. These nutrients promote healthy growth and strong roots. You’re giving your plants everything they need, right at their roots, to make them flourish.
2. Sustainable And Cheap

It’s not just good for your cannabis, it’s also good for your wallet. Most of the ingredients you need are found in your garden or kitchen. Not to mention, there’s no harm done to the environment.
3. Better Flavor And Yield

Using natural methods like FPJ can enhance the terpenes in your cannabis, making the buds smell and taste better. And who doesn’t want bigger, juicier buds? FPJ helps improve the quality and quantity of your yield.
4. Disease And Pest Resistance

Healthy plants are less prone to diseases and pests, and FPJ can help boost the immune system of your cannabis. Think of FPJ as a healthy smoothie that helps prevent your plants from getting sick.
How To Make Homemade Fermented Plant Juice For Cannabis
If you’re curious about making your own FPJ, I’m here to guide you through each step. Let’s dive into what it takes to make this wonder juice at home.
Factors That Affect The Quality Of FPJ For Cannabis

Before we get to the “how”, let’s look at what affects the quality of your FPJ. Here’s what you should keep in mind:
- Plant Selection: Choose healthy plants at the right stage of growth. The best time is early in the morning when the nutrient content is at its peak.
- Sugar Choice: Brown sugar or any unrefined sugar works best. The sugar acts as a preservative and also feeds the beneficial microbes.
- Fermentation Conditions: Fermentation should take place in a cool, dark place. Avoid direct sunlight, as it can interfere with the microbial process.
Best Plants For Homemade FPJ

What Are The Best Plants To Use?
Not every plant is suitable for FPJ. Here’s a handy list of what works best for cannabis:
- Banana Shoots: High in potassium, ideal for boosting flowering.
- Comfrey Leaves: Rich in nutrients, promotes healthy growth.
- Dandelion: High in minerals, helps with overall plant health.
- Pumpkin Shoots: Helps increase plant size and vigor.
- Mugwort: Improves overall plant immunity and resilience.
These plants are nutrient-rich, which means your cannabis will get a concentrated dose of essential nutrients.
Step-by-Step Guide To Making FPJ At Home For Cannabis

Ingredients You’ll Need:
- Fresh plant materials (like those mentioned above)
- Brown sugar
- A jar with a loose-fitting lid
- Gloves (optional but recommended)
Steps To Make FPJ:

- Harvest Your Plants
- Early morning is the best time to harvest. Gather young, vibrant shoots or leaves.
- Weigh And Mix With Sugar
- Use a 1:1 ratio of plant material to brown sugar. Mix them thoroughly in a bowl until the plant pieces are covered.
- Place In A Jar
- Put the mixture in a glass jar. Press down gently, but don’t pack it too tightly. Leave some space at the top for fermentation gases.
- Ferment
- Let the jar sit in a cool, dark place for 7-10 days. You’ll notice a liquid forming—that’s your FPJ!
- Strain
- Strain the liquid into another container, and there you have it! Store it in a sealed jar for future use. The shelf life is about 6 months if stored properly.
Tips During The Process:

- Make sure to keep the jar loosely covered to let the gases escape but keep dust out.
- A little mold on the surface is okay; just skim it off. But if it smells putrid, something went wrong—start over.
How To Use FPJ On Cannabis?
Preparing And Applying Homemade FPJ To Cannabis

Using FPJ correctly is key to getting those big, healthy buds. Here’s how to do it right:
- Dilute Properly
- FPJ is very concentrated, so you’ll want to dilute it before using it. The recommended ratio is 1:500. For example, if you’re using 1 liter of water, you’d only need about 2 ml of FPJ.
- Application Methods
- Foliar Spray: Spray the diluted FPJ on your plants’ leaves during the vegetative stage. It helps with nutrient uptake and overall health.
- Soil Drench: Pouring FPJ onto the soil feeds the roots directly. Apply once every two weeks for best results.
- When To Use It
- Apply FPJ during the vegetative stage to promote growth. You can also use it during the flowering stage, but make sure to use FPJ made from potassium-rich plants like banana shoots.
What Are Some Other Tips For Making And Using Homemade FPJ For Cannabis?

- Best Time Of Day: Apply FPJ in the early morning or late evening to prevent leaf burn.
- Storage: Keep your FPJ in a dark place to maintain its potency.
- Rotate With Other Nutrients: FPJ is great, but cannabis plants also need a variety of nutrients. Alternate with compost teas or other natural fertilizers for a well-rounded feed.
Is FPJ The Same As FFJ?
FPJ and Fermented Fruit Juice (FFJ) are often mixed up. They are similar, but FFJ is specifically made from fruits and is richer in sugars and nutrients that boost flowering. Use FPJ for overall plant health and growth, and switch to FFJ when you want to give your cannabis a flowering boost.
Summary: How To Make Homemade Fermented Plant Juice (FPJ) — A Complete Guide

So there you have it—a complete guide to making your own FPJ at home for cannabis. From collecting the right plants to applying FPJ to your precious cannabis plants, I’ve walked you through everything you need to know. With FPJ, your cannabis will grow strong, healthy, and, of course, packed full of amazing flavor and aroma. It’s all about making your plants happy so they can make you happy!
FAQ: Plant Juice Fertilizer
1. How often should I apply FPJ to my cannabis?
You can apply FPJ once every 2 weeks during the vegetative stage and once during the flowering stage. Be sure not to overdo it.
2. Can I use any plant for FPJ?
No, it’s best to use young, healthy plants that are rich in nutrients. Plants like dandelion, banana shoots, and comfrey work well.
3. How long can I store homemade FPJ?
Properly stored FPJ can last up to 6 months. Make sure to keep it in a dark, cool place to maintain its effectiveness.
4. What are the signs that my FPJ is working?
Look for more vigorous growth, thicker stems, healthier leaves, and increased resistance to pests. If you notice these, your FPJ is doing its magic.
5. What’s the difference between FPJ and compost tea?
FPJ is made by fermenting plant juices, whereas compost tea is made by steeping compost in water. Both are beneficial, but they offer different types of nutrients.
A Quick Look At The Pros And Cons Of FPJ
| Pros | Cons |
|---|---|
| Natural and Organic | Can be time-consuming |
| Cheap and Easy to Make | Needs proper storage |
| Promotes Plant Health | Risk of bad batches |
| Boosts Yield and Flavor | Overuse can cause damage |
| Eco-friendly | Must be diluted before use |
FPJ might seem like a lot of work at first, but once you see the results, you’ll understand why so many cannabis growers swear by it. Give it a shot—your plants (and your buds) will thank you!














I made a well idk if you’d call it an fpj or ffj but it’s cannabis leaves & bananas with molasses for the sugar. Maybe it’s cuz there’s already liquid in the molasses but I have been applying it at a 15 mls a litter or 2ozs a gallon with great results