Germination in various media: Rockwool, Jiffy, soil

The choice of germination medium influences the successful start of cannabis plants:

**Rockwool cubes for germination:**

*Preparation of Rockwool:*

- adjust pH to 5.5 (soak for 24h)

- Adjust EC value to 0.4-0.6

- Squeeze out excess water

- Cubes should be moist, not wet

- Sterile initial situation guaranteed

*Sowing in Rockwool:*

- Insert seeds 1-2cm deep

- Orientate the tip downwards

- Close hole with loose material

- Maintain constant humidity

- Temperature 22-25°C optimal

*Advantages of Rockwool:*

- Sterile conditions

- Precise control over nutrients

- Easy transplantation

- Consistent moisture

- Reusable after sterilisation

*Disadvantages of Rockwool:*

- pH preparation necessary

- Environmental concerns

- Can dry out

- Requires experience

- Higher initial cost

**Jiffy pellets (peat pellets):**

*Jiffy preparation:*

- Soak in warm water

- 5-10 minutes until fully expanded

- pH usually already optimal (6.0-6.5)

- Remove excess water

- Mesh can be left on

*Sowing in Jiffy:*

- Seeds in prefabricated well

- 1cm deep optimal

- Cover surface lightly with peat

- Keep humidity constant

- Direct transplanting possible

*Advantages of Jiffy:*

- Easy handling

- Natural material

- Already optimised pH

- Nutrients included

- Biodegradable

*Disadvantages of Jiffy:*

- Can develop mould

- Drainage sometimes problematic

- Differences in quality between manufacturers

- Single use

- Less control

**Direct soil germination

*Substrate selection:*

- Use light potting compost

- Little to no nutrients

- Good drainage important

- Fine crumbly structure

- Sterile or treated soil

*Sowing technique:*

- Plant seeds 1-2cm deep

- Lightly press down the substrate

- Moisten with a spray bottle

- Maintain even humidity

- Avoid surface encrustation

*Advantages of soil germination:*

- Natural environment

- Cost effective

- No transplantation necessary

- Organic environment

- Less shock for seedlings

*Disadvantages of soil germination:*

- Less control

- Mould and fungus risk

- Uneven germination possible

- More difficult to monitor

- Substrate-dependent results

**Optimise germination environment:**

*Temperature control:*

- 22-25°C optimal for all media

- Heating mat under germination trays

- Thermometer for monitoring

- Constant temperatures important

- Avoid temperature fluctuations

*Humidity:*

- 70-90% RH optimal

- Use propagation dome

- Ventilation slots for air exchange

- Condensation management

- Mould prevention through air circulation

*Lighting for seedlings:*

- Low light after germination

- CFL or LED at 30cm distance

- 18-24 hours daily

- Not too intense at first

- Gradually increase

**Transplantation after germination:**

*Rockwool transplantation:*

- Directly into larger Rockwool blocks

- Or place in other substrates

- Completely bury cubes

- Minimise root shock

- Gradual transition