Harvesting Growth

Selecting the Right Plant Material for Your FPJ

In Korean Natural Farming (KNF), timing is everything—and that includes when and what parts of a plant you harvest to make FPJ (Fermented Plant Juice). Think of FPJ as a mirror: it reflects the life force, hormones, and energy of the plants you collect. The closer your FPJ matches the plant’s current needs, the more effective it becomes.

Why FPJ Works So Well

FPJ is made by fermenting plant material with brown sugar to extract bioavailable nutrients, growth hormones, and enzymes. It becomes a living input—feeding soil microbes and communicating directly with plants. When we harvest the right plant parts at the right time, we create a powerful, stage-specific tool that speaks the same "language" as our crops.

When and What to Harvest for FPJ

Early morning is the golden window. Dew is still present, and the plant’s metabolic signals are high. Always pick from wild, untreated, or healthy homegrown plants—and match your FPJ material to the stage your crops are in.

Vegetative Growth (Young Plants)

What to harvest: New leaf tips, growing vines, grass shoots, mugwort, sweet potato leaves
Why: These parts are full of cytokinins and enzymes that signal growth
When to use: During early leaf and root development, or after transplanting

Pro tip: Fast-growing weeds often make the best FPJs—nature’s own accelerators.

Mid Growth (Leaf & Stem Development)

What to harvest: Vines (squash, pumpkin), mature leaves, balanced green tissue
Why: This provides a more nutrient-stable mix for routine feeding
When to use: As a weekly foliar or soil spray to build plant stamina and resistance

Flower Initiation

What to harvest: Flower buds, flowering herbs like basil, marjoram, oregano
Why: These signal gibberellin and flowering hormone production
When to use: A few days before flowering begins or at early bloom

Fruiting Stage

What to harvest: Immature fruits, fruit-bearing vines, young flowers
Why: Enhances fruit setting and sugar development
When to use: When plants shift energy toward reproduction—great for tomatoes, squash, peppers

Recovery or Stress

What to harvest: Deep-rooted medicinal plants or strong herbs (mugwort, dandelion, comfrey)
Why: These carry stress-response compounds and minerals
When to use: After weather stress, pest pressure, or heavy pruning

How to Use FPJ

Dilution Rate: 1:500 to 1:1000 (about 1–2 tsp per quart / 2–4 mL per liter)
Application: Foliar spray or soil drench
Frequency: Weekly or biweekly for maintenance, more often during transitions or stress

Crop Phase

FPJ Material

Use Purpose

Early Growth

Leaf tips, vines

Rooting, shoot growth

Leaf Stage

Vines, squash leaves

Resilience, energy balance

Flowering

Buds, basil flowers

Flower signal and hormone boost

Fruiting

Young fruits, tips

Sweetness, fruit fill, stamina

Recovery

Mugwort, comfrey

Stress relief and regrowth

A Few Tips

Harvest only what’s thriving—avoid diseased or insect-damaged parts.
Don’t overdo it: FPJ is powerful. Start light and observe.
Label your FPJs by plant type and harvest date for future reference.
Add LAB (Lactic Acid Bacteria) to boost absorption and microbe diversity.

Closing Thoughts

FPJ is more than a tonic—it’s a way to listen to your plants and respond in kind. When made with intention, FPJ becomes a dynamic input tailored to your farm or garden’s rhythm. With practice, you’ll know what your plants are asking for—and have just the brew to match it.

Want to make your own herbal tonic too? Try the OHN (Oriental Herbal Nutrient) recipe card:
storeysinthedirt.com/recipe-cards/p/ohn-oriental-herbal-nutrient-recipe-card

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