Growing Hydroponic Marijuana – Quick Guide 1 & 2
HOW TO GROW HYDROPONIC MARIJUANA or WEED
Plant foods are measured in an N-P-K format.
N is Nitrogen
P is Phosphorus
K is Potassium
A 15-15-15 solution contains 15% Nitrogen; 15% Phosphorus; 15% Potassium. A 20-10-5 solution contains 20% Nitrogen; 10% Phosphorus; 5% Potassium. The percentage of the solution not used by N-P-K is trace elements and inert material.
If you are buying hydroponic nutrient, get the powder kind that mixes with water. It is much cheaper over the long run when you compare it with already mixed solutions.
An all purpose hydroponic nutrient solution with secondary elements like calcium, sulphur and magnesium and trace elements boron, copper, molybdenum, zinc, iron, and manganese will get you through all stages of growth. But depending on the stage of growth, you can adjust different nutrient levels needed at different times to optimize growth.
Higher amounts of N are needed when the temperature will be below 80 degrees in the grow room during vegetative growth. 20-20-20, or 23-19-17, or 12-6-6, or something similar, with trace elements should do it.
If temperatures are higher than 80 degrees in the grow room, you need not worry about more N in the formula during vegetative growth.
During flowering the plant needs lots of P, regardless of temperature. 15-30-15, or 5-20-10, or 2-4-3, or something similar, with trace elements should do it.
Do not over fertilize your plants. Too much fertilizer will kill your plants. If you under fertilize, plants will take longer to grow but will not die. Follow the mixing instructions on your hydroponic solution package, if you aren’t sure, use less rather than more.
As water evaporates it is absorbed by the plants, your water reservoir level will drop. Add tap water that has been aged 3 days or longer to the reservoir. I don’t add nutrient solution when I top up the tank, some people do.
Change the nutrient solution every 2 weeks. That is, discard the old solution and clean out the reservoir, pumps, and other equipment that is used with HOT WATER. After cleaning, add tap water that has been aged 3 days or longer to the reservoir then add nutrient solution. You only need to clean the cups and tubing the plants are in before you start a new crop.
The old solution that you are discarding can be used to water house or garden plants. This will at least double the growth rate if you usually water your plants with regular tap water. More detail on nutrients.
Marijuana nutrient cycle
The timer that starts to pump the nutrient solution should turn on and the solution should submerge the plants roots every twenty minutes. As soon as the roots are submerged, the pump can shut down.
If it takes longer than 20 minutes for the roots to get water, the roots will usually grow long, and they can grow very long looking for the nutrient solution source.
In fact they can grow so long and thick that they prevent the solution from reaching all the way up your grow cups. This will also raise the chance of root material being ripped out and clogging the system. Once the flow is clogged by root or other material inside, you will have to take the garden apart and clean it.
Check the root length every few weeks. If it is hard to remove the cups the plants are in because the roots are anchored to the internal channel, the roots are too long. The root should be short enough to not touch the narrow point where the solution enters the cup holder. If they are too long, trim them down with scissors. Make sure they are not going too far, but don’t cut unnecessarily. More detail on nutrients.
Harvesting and curing
Follow the harvesting directions located here and follow the curing directions click here.
Growing (and smoking) marijuana will produce odors. Sometimes they can be strong enough to attract attention. If you would like to eliminate the smell from growing and/or smoking marijuana the best thing to do is build an ozone generator. More detail on odour control.
If your weed is going to be stored for more than a year it should be wrapped in an air tight container and be stored somewhere that is dark and cool. A freezer is best, but a fridge, basement, closet, or something similar will do. Dry it first if you grow your own, or if the stuff you have is very moist. And remember that light, air and heat are the things to avoid.