How to grow weed with Hydroponics?

Master the lighting. When growing outdoors, the sun is all these guys need. But since you're working under a roof, you'll need to recreate the power of that big ball of fire. When they're young, the plants need blue light; when they're older and budding, they need yellow, amber and red light. You have a few different options in building your system:
High Intensity Discharge (HID) lights such as High Pressure Sodium (HPS) and Metal Halide (MH) lights. These lights produce a lot of heat and are quite powerful, but they use more energy than other types.
Florescent lighting. This type is great for young plants and doesn't use very much electricity. However, once your plants get older, you'll need to get them more light somehow.
Compact Florescent Lights (CFLs). These are easy to find and also don't use much electricity -- because of that, you'll need to stock up. These may be better used as a supplement to a different type of lighting.
LED lights. As far as types go, LEDs use less electricity and produce less heat than their competitors. Though when you go about purchasing some, know that certain brands well outrank others in efficacy and durability of product.[8]
The technology behind LEDs is getting more refined and the new trend is in broad-spectrum LED grow lights. They cover the 420 to 730 growing range and use 82% less electricity than the narrow-spectrum devices. They generally keep cool, don't emit a lot of heat, and last for up to 60,000 hours.[9]
Set up your hydroponic system. There are number of methods to choose from and a plethora of devices that are out there just waiting to be bought. Do the research before you go about choosing anything. [10]
Wick system: This uses just one pump to keep the solution aerated and a grand total of zero to keep it moving -- super easy for beginners to maintain and use successfully. The plant actually takes in just the amount of solution (nutrients) it needs through the wick (a thick acrylic cord works well), giving it only what it needs.
Ebb and flow system: This system uses a timed pump and reservoir to give the plants their food about 4 times a day (at least to start). You simply place the plants in pots, then place those pots in a tray that holds about 6" (15 cm) of the nutrient solution you're using. If you're using Rockwoll, this system is ideal.
Top feed growth system: This system is one of the more complex, at least mechanically. Each plant is fed at its base and any run-off is drained back into the reservoir. If you do choose this method, a 15-minute feed 3 or 4 times a day is where you should start.

Get the right hydroponic nutrients. As mentioned before, when you go about purchasing plant food and/or solutions, look for the N-P-K format on the label. Generally, your two options will be 15-15-15 and 20-10-5.
If you are buying hydroponic nutrients, get the powder kind that mixes with water. It is much cheaper over the long run when you compare it with already mixed solutions.
Germinate your seeds. The standard thing to do is use a Rockwool cube to start the seed on and surround it with whatever growing media you use. Keep the Rockwool cube so that the bottom 70% or so is submerged when the water is at its maximum, but keep the top part above the water so that the seed is never submerged. [11]
You may also use Vermiculite, Perlite, or clay pellets (in addition to soil). Beginner growers are usually better off buying a medium from the store, whether that be brands like Pro-Mix or Sunshine. When you become more advanced you will want to save money by creating your own medium and generally they are created using the same bases such as sphagnum, peat moss or coco coir.[12]
That being said, the main advantages of soil are its natural buffering ability in keeping pH constant and it is very forgiving in the event of electrical or mechanical failure when feeding or watering.
After the seeds have germinated and the root is about a quarter of an inch long, place the seed, root down, on your grow cube or media in your hydroponic cups.
Watch for the first stage. The first phase of marijuana growth is called the vegetative phase. If you plan on using LED, MH or HPS right away, start with about 20 inches or more above the top of the plant (less for LEDs) and lower the light an inch or so daily until you think the height is right. Too close and the plants will dry and turn brown; too far and the plants grow too tall as they stretch to get closer to their light source.
Start high and lower the light an inch or two daily until you think the height is right and the light emitted is being caught well by the plants.
During the first stage of growth, keep the light on 18 to 24 hours a day minimum. The longer it is on, the faster the plants will grow (but the higher your electricity bill will be).

Watch for flowering. This is when the THC, CBN, and CBD are produced -- the ingredients needed to reach a high. It's only produced on the females and the process is fairly evident; the growing process will slow as the plants devote more energy to creating the buds.
When the plants are at least 6" (15 cm) high and have 4 sets of leaves, you're in the clear to start the flowering process. For most hydroponic plants, this takes 2-4 weeks, so be patient. When you think your greens are ready to flower, cut the light back to 12 hours a day.
If your plant has reached that 6" mark and you start flowering anyway, it'll keep growing for up to a month. It should then stop, putting all its energy into producing flowers. If you wait for it to mature a bit more, the process should only take around 10 days.
Consider limiting the height of your plants. Though your first thought should be to mess with the area, not your actual plant. The easiest thing to do is to adjust the height of the light. You can experiment with growing stunted plants, but each method takes a lot of skill and expertise and therefore won't be outlined here.
Be patient. If you did go the hydroponic route, it'll take about 3 to 4 months for your plants to flower. However, there are two methods that speed up the process, though they're quite difficult and should only be left to the pros. But if you're curious:
Sea of Green, or SOG, is a way of growing cannabis that forces the plants into the flowering stage when young and small. By starting the flowering phase of your marijuana plants after about two weeks of vegetative growth you can harvest many weeks earlier than you would if you grew your plants to full size.[14]
Screen of Green, or SCROG, is one of the most productive systems for growing weed that there is. Cannabis plants are trained through a horizontal screen placed above them, spreading the tops of the plants along a horizontal plane and encouraging bud formation along the normally neglected branch stems

Make it dark. You want to get as close to simulating a patch in the woods as possible. During flowering, everything should be dark, dark, and darker still. That means no room light, sunlight, or any other light for half the day (that's 12 hours). The only light that's even remotely acceptable would be equivalent to that of the moon.
Light that is any stronger could delay flowering. Your plant could become stunted and stay in the vegetative phase, never flowering at all.
When you start seeing light white hairs near the buds, your plants have started to flower. This should happen just short of or up to 2 weeks into the flowering light cycle. When your plants hit this stage, remove the male plants. Unless you have all female clones, that is. Once alone, the pistils will become the red or white hairs that turn into beautiful buds
Flush the plants with clean, nutrient-free water. Do this once during the flowering phase and again after 6 weeks and then again just before harvesting. This will help remove any build up of fertilizers within the plants or growing medium, making for a cleaner smoke
Harvest your plant. It's absolutely imperative, once again, that you are patient. No one can tell you the exact time to harvest your plant -- it varies plant to plant and strain to strain. Normally, the process takes around 2 to 3 months. Once you've been to the rodeo a few times, you'll know.
As the female flowers grow they form heavy "kolas" or cones. You will notice each ovary swell and tiny crystals will be visible around the flowers. The flowers will become sticky to the touch and the aroma will become pungent. As the flowers swell the white pistils begin to darken, growing from white to a reddish brown. Most growers wish to harvest marijuana plants when THC production has reached its maximum. A rough guide is to wait until around 60% of the white pistils have darkened.[16]
During this time, you may notice some of the larger leaves yellowing and wilting. This is not cause for alarm and is perfectly natural. Remove these, if you'd like, to allow more light to the rest of the plant.

Dry your marijuana. Leave only the buds when you're ready to dry your weed. Attach them to a wire or string and hang them upside down in a cool, dark room. Get the fan circulating or turn on the air as plenty of air movement is necessary for adequate drying. However, know that buds that are forced to dry too quickly get a nasty "green" taste (this is due to the retained chlorophyll).
Allow your plants around 4 – 7 days to dry completely. Squeeze the buds between your forefinger and thumb -- is it dry? When they are, you should seal them in an airtight jar or bag. For the next few days let them breathe for 15 minutes, twice a day. This cures the buds, ensuring all water is removed and makes them better to smoke -- they get a smooth, sweet taste and have an even burn

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