How often should a plant be fertilized?

During the vegetative phase, 2 to 3 times a week with a mineral fertilizer, or once a week with an organic fertilizer. During flowering, reduce a little. Important: always start with half the recommended dose and increase as needed.

What does NPK mean on a fertilizer?

NPK stands for nitrogen (N), phosphorus (P), and potassium (K) — the three main nutrients. The numbers on the package (e.g., 5-3-4) indicate the ratio. Plants need more nitrogen during growth, and more phosphorus and potassium during flowering.

Organic or mineral fertilizer: which is better?

Both have advantages: organic fertilizer promotes better aromatic profiles and is more sustainable. Mineral fertilizer acts faster and can be dosed more precisely. Many gardeners combine both methods.

How to recognize an excess of fertilizer?

Typical signs: burnt leaf tips (brown/yellow), dark leaves, curled leaf edges, and too high an EC value in the drainage water. Rinse immediately with clear water and suspend fertilizer application.

FERTILIZER GUIDE

Fertilizer Guide for Plants

Organic vs mineral, understanding NPK values and the ideal fertilization plan for each growth phase of your plants.

Legal Note (France): the domestic cultivation of cannabis (THC) is prohibited in France. This guide is purely informative and focuses on the general nutrition of plants, applicable to legal plants, herbs, and hemp where the law permits. This content does not encourage any illegal cultivation. Always check the current regulations before cultivating.

N-P-K

Nutrients

2 600+

Searches/month

Phases covered

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01 / TYPES OF FERTILIZER

Organic vs Mineral

The two main categories of fertilizers have different strengths. Which one suits your way of cultivating?

Organic Fertilizer

Natural nutrient sources like compost, worm humus, bat guano, and fish meal. Promotes soil life and sustainably replenishes nutrients.

Advantages

+ Better aromatic profiles
+ Sustainable cycle
+ Hard to overdose

Disadvantages

− Slower action
− Less precise to dose

Mineral Fertilizer

Synthetic nutrient salts with immediately available NPK values. Fast action and exact dosing possible.

Advantages

+ Immediate availability
+ Precise dosing
+ More economical

Disadvantages

− Easy to overdose
− Can harm soil life

02 / FERTILIZATION PLAN

NPK by Growth Phase

Each phase has different nutritional needs. The right fertilization plan maximizes yield and quality.

Seedling Phase

1-1-1

Priority: Balanced

Young plants need little fertilizer. Light and balanced supply every 7 to 10 days.

Vegetative Phase

3-1-2

Priority: Nitrogen (N)

Nitrogen promotes leaf growth and chlorophyll. Fertilize weekly, increase EC value.

Flowering Phase

1-3-2

Priority: Phosphorus (P)

Phosphorus and potassium promote flower formation and resin production. Reduce nitrogen.

Flushing

0-0-0

Priority: Water only

2 weeks before harvest, water only with neutral pH water. Improves taste and purity.

FREQUENTLY ASKED QUESTIONS

FAQ: Fertilizers for Plants

More Know-How

Optimize your cultivation with the right substrates and equipment.

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