Cannabis

  • Hemp (Hydroponics)

    Hemp / Cannabis

     Recommendation
     Planting distance  75cm
     Root length  80cm
     Plant height  60 - 200cm
     Sun  full sun
     lighting  12 - 16 hours
     Soil type (for soil cultivation)  any, preferably black earth
     Nutrient requirements total  very high
     Nutrient dosage (NPK)  20-20-40
     pH range  6.0 - 7.0  suitable plants
     Ec - area  0.8 - 2.0 
     Climate zone (USDA)  12a ~ > 8°C
     Growth in frost  no
     Temperature damage  < 5°C
     Frost resistance  no
     Days until germination  7 - 12
     Days until harvest  90 - 120
     growing season  1 year
     
    Varieties commonly used in cultivation:
    • Cannabis sativa
    • Cannabis Indica

     Illustration Amaranthus retroflexus0 small

    Cannabis sativa  L., from  Köhler's medicinal plants

    Cannabis: Early substitute for cotton or linen (clothing, ropes, etc.) and
    also used as medicine.
       

     

     Cultivation
     Preferred systems  NFT

     

     

    Nutrient Starting phase Yield phase
    Dose - + - +
    NO3​   10.0     
    K   5.0    1.0
    Approx   1.0 0.8  
    B   20.0    
    Fe       10.0
    All information in  mmol 
    See also: deficiency symptoms
     

    Cannabis is an annual plant; the entire life cycle lasts one year, although the plant often ends its life cycle after just four to ten months. Depending on the growth phase, the appearance of the plant and its needs change. This requires different amounts of light, water and nutrients.

     

    Here are the four (main) phases:

     
    1st germination phase (1 to 2 weeks)
    • Cultivation: paper towel/moist, Jiffys, coconut mat, etc.
    • Duration: between 24 hours and 7 days. Cannabis strains with a high indica content germinate faster than sativas.

    2. Seedling phase (2 to 4 weeks)
    • Susceptible to disease and mold.
    • As much light as possible.
    • The duration of the seedling phase depends on the variety and environmental factors
    • When the plant produces the full number of fingers on a new leaf, the seedling phase is complete.
     
     
    3. Growth phase / vegetation phase (2 to 8 weeks)
    • Growth up to 5 cm per day.
    • Duration / rough estimate: Autoflowering cannabis strains enter the flowering phase after 2 to 3 weeks. Regular or feminized strains only start flowering when the days get shorter. In the northern hemisphere this is the summer solstice on June 21st. of the year (outdoor). Indoors, lighting time is reduced to 12 hours or less.
     
     
    4. Flowering phase (4 to 12 weeks)
    • Beginning of reproduction.
    • Only now can the gender be determined with certainty. 
    • Special fertilizer can be used here to stimulate flower formation.
    • Much water.
    • Possibly support the plant so that it can support the weight of the flowers.
    • In view of hormone production, it should be cut back to a maximum of the second week of the flowering phase.
    • Duration of the flowering phase: Variety dependent. Autoflowering cannabis can be ready to harvest in as little as a month, while indica takes around 6 to 8 weeks.
    • Some sativa strains can take over 3 months. 

    Context: 

    ID: 575

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