Growing and Cultivation

When to Start Using Fertilizers with Cannabis


Beginner growers often wonder when they should start using fertilizers on their plants, but it depends on different factors such as their growing method, the chosen strain, and the phase their plants are in, among other things. So, in order to shed some light on this subject; in this article, we’re going to talk about when to start using fertilizers with cannabis.

Fertilizing Cannabis Plants

Fertilizing cannabis plants is vital to provide essential nutrients that enable healthy growth and maximize yield and potency. Without proper fertilization, plants can suffer from nutrient deficiencies, leading to stunted growth, poor bud development, and lower-quality harvests.

fertilizing cannabis plants

Additionally, well-fertilized plants are more resilient against pests, diseases, and environmental stressors, ensuring a successful cultivation process. Undoubtedly, fertilizing cannabis plants is a key practice for growers to achieve healthier, more productive, and higher-quality crops.

Essential Nutrients for Cannabis Plants

Cannabis plants require several essential nutrients to grow and thrive. These nutrients are crucial for various physiological processes and overall plant health. Some of these essential nutrients include:

  • Nitrogen (N): Nitrogen is essential for the vegetative growth phase, as it promotes leaf and stem development. It plays a significant role in chlorophyll production and overall plant vitality.
  • Phosphorus (P): Phosphorus is critical for root development, flowering, and fruiting. It is especially important during the flowering stage when the plant’s energy shifts towards bud production.
  • Potassium (K): Potassium helps with overall plant vigor, root development, and nutrient uptake. It also contributes to the plant’s resistance to diseases and stress.
  • Calcium (Ca): Calcium is necessary for cell wall structure and stability. It helps prevent nutrient imbalances and various physiological disorders like blossom end rot.
  • Magnesium (Mg): Magnesium is a central component of the chlorophyll molecule, which is essential for photosynthesis. It is critical for healthy green foliage.
  • Sulfur (S): Sulfur is another component of amino acids and proteins and is essential for overall plant growth and development.

Types of Fertilizers

When it comes to fertilizing your cannabis plants, there are various types of fertilizers to choose from, each offering distinct advantages depending on your specific cultivation goals and preferences.

Organic Fertilizers

Organic fertilizers are derived from natural sources and are rich in organic matter. They release nutrients slowly as they break down, providing a steady and sustainable source of nutrition for your cannabis plants. These fertilizers are favored by many growers for their ability to improve soil structure and microbial activity, promoting overall plant health. 

Synthetic Fertilizers

Synthetic or chemical fertilizers are manufactured to provide precise nutrient ratios and are readily available for plant uptake. They are known for their fast-acting nature, making them a suitable choice for hydroponic systems or when a quick nutrient correction is needed. These fertilizers often come in various formulations, such as NPK ratios, tailored for different growth stages of cannabis plants.

When to Start Using Fertilizers with Cannabis

Depending on the phase your grow is in, your plants are going to need certain nutrients in higher proportions; they need more Nitrogen in growth, and phosphorus and potassium for the flowering period. Cannabis plants absorb large quantities of these nutrients as well as others, so if they don’t get them through irrigation, then they’ll probably end up showing deficiencies through stains on the leaves.

fertilizing seedlings

Seedling Stage

For the first few weeks after germination, cannabis seedlings can thrive with minimal supplementation. It’s best to use a light, balanced fertilizer with a low concentration to avoid overwhelming the delicate plants. Start with half-strength or quarter-strength doses and gradually increase as the seedlings mature.

Vegetative Stage

To start using nitrogen during the growth phase, you’ll need to wait for your little plant to grow the roots out enough so that it becomes slightly stronger. It won’t need much more than some humidity to germinate and grow during the first few days, but once it begins growing faster, then you’ll need to start using a growth fertilizer.

Flowering Stage

Once the female flowers begin showing, then you’ll need to begin using flowering fertilizers. Just like in the growth period, you’ll need to start off little by little until you reach the maximum milliliters stated by the fertilizer manufacturer, alternating between pure water and fertilizers.

Nutrient Deficiencies

Nutrient deficiencies can manifest in various ways, affecting the health, growth, and overall yield of your cannabis crop. Here, we will explore some of the most common nutrient deficiencies:

Nitrogen Deficiency

Signs and Symptoms:

  • Yellowing of the lower leaves, starting from the tips and moving inward.
  • Reduced growth and smaller leaves.
  • Overall yellow or pale green appearance of the plant.


  • Apply a nitrogen-rich fertilizer with a higher N content.
  • Ensure proper pH levels in the growing medium to optimize nutrient uptake.

Phosphorus Deficiency

Signs and Symptoms:

  • Dark green or purple-tinged leaves.
  • Slow growth and stunted development.
  • Dark, brittle stems.
  • Delayed flowering.


  • Use a fertilizer with higher levels of phosphorus.
  • Adjust pH levels for improved phosphorus uptake.

Potassium Deficiency

Signs and Symptoms:

  • Yellowing and browning of leaf margins, often resembling burnt edges.
  • Weak stems and poor bud development.
  • Increased susceptibility to pests and diseases.


  • Choose a fertilizer with elevated potassium levels.
  • Maintain proper pH to enhance potassium absorption.
yellowing cannabis leaves

Tips and Recommendations

To ensure your cannabis plants thrive, they are some key points to take into account when starting using fertilizers:

  • Soil Testing: This will provide valuable information about your soil’s nutrient composition, pH levels, and deficiencies.
  • Start with a Baseline Dosage: This cautious approach allows you to observe your plants’ response to the fertilizer without risking over-fertilization.
  • Monitor Plant Health: Common signs of over-fertilization include burnt leaf tips or edges, yellowing or browning of leaf margins, curling or twisting of leaves, etc.
  • pH Monitoring: Invest in a pH meter or pH testing kit to ensure your soil or hydroponic solution falls within the recommended range for cannabis growth (typically between 6.0 and 6.8 for soil).
  • Adjust Fertilization: If you notice any signs of over-fertilization or nutrient imbalances, take corrective action immediately. 

In conclusion, the timing of fertilizer application is a crucial aspect of successful cannabis cultivation. By understanding the growth stages and nutrient needs of your plants, you can make informed decisions about when and how to use fertilizers, ultimately leading to healthier, more abundant, and higher-quality cannabis yields.

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