CONTENTS

CONTENTS

Transplanting

a step-by-step guide for healthy root development

Why transplanting matters

Transplanting is a crucial step in cannabis cultivation. Done correctly, it promotes root expansion, enhances nutrient uptake, and supports overall plant growth. Without transplanting, plants can become root-bound, stunting growth and reducing yields.

Why transplanting is important

1. Root expansion Plants outgrow their pots quickly and need space for healthy root systems.
2. Nutrient absorption Fresh medium replenishes nutrients and improves plant health.
3. Improved drainage & aeration Larger pots allow better water flow, oxygen, and overall plant vitality.
ESSENTIAL STEPS
  1. Prepare the new pot with soil or hydro medium.
  2. Water lightly to reduce shock.
  3. Gently move the seedling, keeping roots intact.
  4. Maintain consistent humidity (60–70%) for the first few days.

Phase-by-phase transplanting needs

Each growth phase has specific transplanting needs. Understanding these requirements will help ensure you provide the best environment for your plants at each stage.

Phase Pot size Frequency
Germination Plugs/cubes No transplanting needed
Use small containers for controlled moisture and humidity.
Seedling 0.5–1 L After 1–2 weeks
As roots begin to peek through drainage holes, transition to larger pots.
Early Vegetation 3–5 L 1–2 weeks post-seedling
Use pots with aeration (e.g., fabric or air pots) to encourage rapid growth.
Main Vegetation 10–15 L After root-binding signs
Ensure ample space for root growth during peak vegetative stage.
Late Vegetation 15–20 L Rarely necessary
Transplant only if necessary to sustain the plant through pre-flowering and flowering.

Transplanting steps: how to do it right

Transplanting requires careful handling to avoid root damage and minimise transplant shock. Follow these steps to ensure your plant’s roots have the best environment to thrive.

Prepare your medium and tools

Medium pH-adjusted (Soil: 6.0–6.5).
Pots Fabric or plastic pots with excellent drainage.
Tools Sterilised scissors, gloves, and beneficial microbes (e.g., mycorrhizae).
Water pH-balanced water (6.0–6.3) at 21°C (70°F).

Step-by-step transplanting process

  1. Water the plant before transplanting
    Moist soil helps maintain the root ball’s integrity during transplanting to ensure the roots stay intact and reduces damage.
  2. Prepare the new pot
    Fill the new pot halfway with medium. Add beneficial microbes (e.g., mycorrhizae) to promote root health and facilitates nutrient absorption.
  3. Remove the plant from the old pot
    Gently squeeze the pot to loosen the root ball and lift the plant by the base of the stem to avoid damaging the roots.
  4. Position the plant in the new pot
    Place the plant in the centre of the new pot. Add medium around the root ball, leaving 2.5 cm (1 inch) below the pot’s rim, providing a stable environment for the roots to expand.
  5. Water thoroughly
    Use pH-balanced water to settle the medium and hydrate the roots, ensuring the roots settle and reduces transplant shock.

Transplanting in hydroponics

Hydroponic systems provide an inert growing medium that delivers nutrients directly to the plant roots. Successfully transitioning seeds into a hydroponic setup requires careful handling to avoid damage to the delicate roots.

Step-by-step guide to transplanting into hydroponic systems

1. Choose the Right medium
  • Popular choices include Rockwool cubes, expanded clay pebbles (Hydroton), or coconut coir.
  • Rockwool cubes are particularly effective due to their ability to retain moisture and provide excellent aeration.
2. Prepare the medium

For Rockwool cubes:

  • Soak the cubes in pH-balanced water (pH 5.5) for 1–2 hours to neutralise their naturally high pH.
  • Gently squeeze out excess water, leaving them damp but not soggy.

For expanded clay pebbles (Hydroton):

  • Rinse thoroughly to remove dust and debris.
  • Soak in pH-balanced water for 24 hours to stabilise the pH.
3. Handle the seed with care
  • Use sterilised tweezers or clean hands to handle the seed.
  • Hold the seed by the shell, avoiding contact with the delicate root (radicle).
4. Place the seed in the medium

For Rockwool cubes:

  • Create a small hole (~1 cm deep) in the cube.
  • Place the germinated seed gently with the root pointing downward and cover lightly.

For expanded clay pebbles (Hydroton):

  • Fill the pot halfway with pebbles.
  • Place the seed in the centre with the root facing downward and cover lightly with pebbles, leaving space for root development.
5. Transition to the hydroponic system
  • Place the medium into the designated container (e.g., net pot).
  • Ensure the bottom of the medium lightly touches the nutrient solution to encourage root growth.

Maintaining optimal conditions in hydroponics

1. Nutrient solution
  • Begin with a mild nutrient solution at 25% strength, suitable for seedlings.
  • Maintain pH levels between 5.5–6.2.
  • Check the electrical conductivity (EC) to prevent over-fertilization.
    Target EC: 0.4–0.6 mS/cm during early growth.
2. Watering frequency
  • Keep the medium moist but avoid water logging.
  • In systems like Deep Water Culture (DWC), ensure proper aeration using air stones.
3. Lighting
  • Use low-intensity lights such as CFLs or LEDs during the first week.
  • Maintain a distance of 30–45 cm from the canopy to prevent light stress.
4. Humidity and Temperature
  • Humidity: 70–80% for ideal root development.
  • Temperature: maintain between 22–26°C (72–78°F).

Common issues and solutions

1. Wilting seedlings
CAUSE Overwatering or poor aeration.
SOLUTION Ensure proper drainage and aeration; reduce watering frequency.
2. Slow root development
CAUSE High temperatures or low oxygen.
SOLUTION Lower water temperature to 18–20°C (64–68°F) and use air stones.
3. Yellowing leaves
CAUSE Nutrient deficiency or pH imbalance.
SOLUTION Adjust pH to 5.5–6.0 and slightly increase nutrient strength.
4. Algae growth on medium
CAUSE Excess light on medium surface.
SOLUTION Cover the medium with opaque material (e.g., black plastic).

Why choose hydroponics?

Although hydroponics requires careful preparation, it offers an efficient and reliable method for cultivating healthy plants from seed to harvest.

  1. Accelerated growth Direct nutrient delivery promotes rapid root development.
  2. Controlled environment Eliminates variability caused by soil quality.
  3. Maximised yields Plants in hydroponic systems often produce higher yields due to consistent nutrient availability.

Transplanting between substrates

Transitioning cannabis plants from one substrate (e.g., hydroponics) to another (e.g., coco/perlite or soil/perlite) can be challenging but is sometimes necessary. Proper preparation, handling, and an understanding of the risks are critical to plant survival.

1. Preconditions and precautions
Healthy root system Ensure roots are free from disease or damage, as unhealthy roots will struggle to adapt.
Gradual adaptation Gradually adjust humidity, temperature, and lighting conditions to avoid shock.
Preparation Match the pH and EC levels of the new medium to the current substrate.
2. Steps and tips
Prepare the new container Use a well-aerated substrate like coco coir with perlite or soil with perlite. Ensure good drainage and pre-soak the medium with nutrient-adjusted water.
Minimise root disturbance Gently remove the plant from its current medium. For hydroponic roots, rinse carefully to remove debris that may affect the new environment.
Post-Transplant Watering Water thoroughly to eliminate air pockets around the roots and reduce stress.
3. Potential risks
Root shock Sudden changes in substrate, pH, or nutrient availability can delay growth or cause wilting.
Drainage issues Ensure the new medium provides similar or improved drainage to prevent overwatering and root rot.
4. Timing
Reasons Equipment malfunction, poor substrate performance, space limitations, etc.
Best Time Early vegetative stage, as plants recover more easily during this phase. Avoid transplanting during flowering, as stress can significantly reduce yields.

Frequently asked questions

A recap with plenty of useful information

It prevents plants from becoming root-bound and supports healthy growth.

When roots peek through drainage holes or show signs of being root-bound.

The cluster of roots and soil around the base of the plant.

It’s better to use progressively larger pots to avoid overwatering issues.

Handle plants gently and maintain stable environmental conditions.

Fabric pots or those with good drainage are ideal.

No, fresh medium usually has sufficient nutrients for a short time.

Water lightly and allow the medium to drain fully.

Yes, but sterilise them first to prevent contamination.

Beneficial fungi that enhance root nutrient absorption and resistance to stress.

Use aerated, pH-balanced soil or coco for optimal root growth.

Avoid this unless absolutely necessary to prevent yield loss.

Yes, but handle roots gently and rinse off hydro residues.

Only trim damaged or excessively long roots, if necessary.

They improve nutrient uptake and stress tolerance.

Water only around the root zone and allow proper drainage.

It prevents root rot and ensures oxygen reaches the roots.

Yes, adding pebbles at the bottom improves aeration.

Most plants recover in 1–3 days with proper care.

Look for dense root spirals or slow growth.