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Growing Schedule for Hydroponics

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Cannabis Hydroponics System
November 05, 2020
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Marijuana plants have a life cycle. From seeds to seedlings until reaching full maturity, we get all of that. But when it comes to week by week growth stages, that is when the lack of experience kicks in – what can we expect and what the heck are we supposed to do? To answer that question, here is a sample growing schedule for Amnesia Haze Feminized in hydroponics. We hope this article serves as a guide for your future endeavors.

A Quick Look at Amnesia Haze

With roots tracing back to South Asian and Jamaican landraces, Amnesia Haze is one of the best Sativa hybrids in the world. It never fails to put a smile on the face as an intense euphoric buzz fills the head. Not only does it enhance the mood, but it also supplies the energy, fueling you to be productive physically. It can indeed inspire creative thoughts and ideas, making it perfect for brainstorming or creating content.

Amnesia Haze is also not purely for recreational use. Aided by a generous blend of terpenes, it also boasts potent medicinal properties. You can use it as a means to destress or mitigate symptoms of anxiety and depression. It can also be a source of near-instantaneous relief from neuropathic pains and muscle aches.

Key Facts:

  • THC: 22%
  • Flowering Time: 9-10 weeks
  • Yield: 600-650 gr/sqm
  • Effects: Energizing and psychedelic
  • Medical: Depression and fatigue

Growing this hybrid for personal consumption is also much more straightforward than decades ago. Homegrown Cannabis Co. ensures that you only receive premium-quality Amnesia Haze feminized seeds. They are quick to germinate, and that is to be expected of a reputable seed bank. More importantly, stringent quality control measures guarantee that each seed houses highly reliable genetics free of defects.

Amnesia Haze has a long growth cycle. Knowing its growing schedule is necessary if you live in places where the temperature turns cold during fall. Of course, that is not a concern if you were to grow the plants inside your house. For hydroponics, here is a peek at what happens week-by-week.

Hydroponics Growing Schedule

Since the plants are to be grown hydroponically, then it makes sense to germinate the seeds in rockwool for easy transplanting. In this growing schedule, we will use 4 feminized seeds of Amnesia Haze, 400-watt MH bulb, and 600-watt HPS bulb.

Marijuana plants, generally, thrive in a slightly acidic environment between 5.5-6.5 pH. Rockwool, however, is alkaline at 7.0-7.8 pH. Hence, before using these cubes, they have to be soaked in pH-adjusted water between 5.5-6.0 pH. Avoid using water below 5.0 pH as this damages the fibers of the rockwool cubes.

Secondly, use a TDS meter to test the water. An ideal reading should be around 600 ppm. If it is too high, then you will need to filter the water to bring it down. If it is too low, then add some fertilizer.

Once the taproot emerges, continue to provide care for the young plants. In 2 to 3 weeks, they should be ready for transplanting into your hydroponics system.

Vegetative Stage

During this stage, we use MH light, which emits the light spectrum needed by plants to grow roots, branches, stems, and leaves.

Week 1

  • Light: 400W MH at 50%, 40″ from the plants, 18 hours on
  • Temperature: 75°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 80% RH
  • Acidity: 5.8 pH
  • TDS: 650 ppm
  • EC: 1.3 mS/cm

Before transplanting the seedlings, you should have run your system for a full 24 hours to make sure everything is working. Take note of the environmental conditions – the light-on and light-off temperature of the grow room and the nutrient solution, humidity, and pH.

During this stage, you will be using nutrients that contain a higher level of nitrogen. When adding fertilizers to water, make sure that you keep it around 650 ppm.

Throughout the week and beyond, make it a habit to monitor temperature and humidity daily and make adjustments as necessary. As the plants absorb nutrients, the pH level goes up while the ppm drops. What you want to do is to add some nutrients and keep the pH level around 5.8. Some people do this every two days, while others do it daily.

Towards the end of the week, the length of the roots and the plant’s height should be roughly the same.

Week 2

  • Light: 400W MH at 100%, 20″ from the plants, 18 hours on
  • Temperature: 75°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 80% RH
  • Acidity: 5.8 pH
  • TDS: 750 ppm
  • EC: 1.5 mS/cm

The plants should look healthy and ready to grow even more. A couple of changes that you make to start the second week is going 100% with the MH bulb and lowering the height, 20″ above the plants.

With the significant changes in lighting, there are two things you need to observe. One is ensuring that the temperature in the grow room does not exceed 85°F. Otherwise, it may result in a light burn. Second is watching out for signs of burning on the leaves.

Topping is an excellent way of increasing yields. You could cut off the top part of the plant to halt its upward growth. Consequently, the plant’s growth hormones are diverted to new offshoots and stalks in the lower areas. New branches grow, and the plant gets bushier. You will be pleased with the plants having more bud sites and a more even canopy. Come harvest time, not only is the yield higher, but the overall quality of the buds will be excellent too.

When do you begin topping?

This week is a good time. And up until the second week of the flowering stage, you could top new branches.

One problem that may come up is excessive nutrients. If that should occur, you will notice some of the leaves turning brown. You could lower the ppm a little bit by adding some water.

As you watch the plants grow more branches and get bigger, there is another thing that you should do. Add a small oscillating fan in the grow room. It should not blow directly on the plants. Instead, direct the fan towards the wall. Your goal is to cast a slight breeze, just enough to cause little movements. Think of it as the plants exercising and thus grow sturdier stems. Adequate circulation of air also helps prevent the build-up of moisture in the lower areas.

As the week comes to an end, you may notice that the leaf tips of the plants are touching each other. If so, congratulations. Your plants are ready for the next milestone – transitioning to the flowering stage.

Flowering Stage

By this time, the anticipation must be building up inside you. The moment has come for your ladies to fulfill their destiny. If they are at least 6″ tall and have four sets of leaves, then go ahead, flip the switch. It is time to go on a 12/12 light cycle. Cutting down the light-on time tricks the plants into thinking that autumn is around the corner, and they better start producing flowers to reproduce or else.

Week 1

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 70% RH
  • Acidity: 5.8 pH
  • TDS: 850 ppm
  • EC: 1.7 mS/cm

It will take some time before you start noticing massive physical changes. During this week, and into the second and to the third week, you should still provide nitrogen-rich nutrients.

Since you are now using the more powerful HPS at 600 watts, be sure to observe for signs of light burns on the leaves. You could also direct the fan to blow the wind between the upper canopy and the bulb. Doing so helps eliminate heat being concentrated in a central spot beneath the lamp itself.

In preparation for changing nutrient mixture, you could also take the time to make sure that your bucket and water is clean. Watch out, too, for signs of pests and diseases. Notice also, that the humidity level should be adjusted to 70% RH.

Week 2

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 70% RH
  • Acidity: 5.8 pH
  • TDS: 950 ppm
  • EC: 1.9 mS/cm

You should now stop topping the plants. Pruning, on the other hand, is okay. So, you could continue removing the small side shoots that are not needed. Doing so frees up energy and resources, putting them to better use in developing buds.

Also, you can expect the plant to start stretching. As the foliage becomes denser, make sure that there is still adequate air circulation beneath the canopy, not only above. It is also quite possible that the distance between the HPS lamp and the plants becomes shorter. If that is the case, then adjust the height to maintain a distance of 20″.

As a beginner grower, you may want to skip super cropping – the most aggressive form of high-stress training. If you feel confident enough, or have the experience, then, by all means, do it if the plants are getting too tall.

Week 3

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 60%
  • Acidity: 5.8 pH
  • TDS: 1050 ppm
  • EC: 2.1 mS/cm

It is the third week since you flipped the switch. By now, you should see preflowers. If so, then you should use a magnifying glass or, even better, a jeweler’s loupe to inspect and identify the gender. Although the Amnesia Haze plants were grown from feminized seeds, it is still a good practice to confirm that the plants are, indeed, females.

As they stretch more, you can expect the plants to consume more water and nutrients. It is also time to make a nutrient mix. In the vegetative stage, you used nutrients high in nitrogen. During the flowering stage, your plants need higher levels of phosphorus and potassium. Remember to flush the plants first by using plain water before adding the new nutrient mix.

One more thing, you also want to bring down RH to 60% during this week.

Week 4

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.5-5.8 pH
  • TDS: 1150 ppm
  • EC: 2.3 mS/cm

You should now see more bud sites. If you have not done so, then it is time to switch to bloom nutrients. The plants do not need as much nitrogen as it did since its focus should now be on developing flowers. The high levels of phosphorus and potassium make that possible and also plays a crucial role in producing trichomes. Also, adjust the pH down to 5.5 to maximize the absorption of these minerals.

This is also the last time you can super crop the plants.

Week 5

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.5-5.8 pH
  • TDS: 1200 ppm
  • EC: 2.4 mS/cm

One of the things you can do to enhance potency is to provide as much light as possible. You could tweak the distance, moving the HPS lamp closer to the plants. Alternatively, you could delay increasing the range as the upper canopy of the plants stretch closer. Either way, more light results in higher potency and yield.

Be extremely mindful, though, that the closer the buds are to the HPS lamp, the hotter it gets and may result in bleaching, heat stress, and burn. So, watch out for the signs such as yellowing or burnt leaf tips. Generally, if you place your hand just above the bud sites and feel uncomfortable, then you can expect your plant to feel the same way too.

Week 6

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.8 pH
  • TDS: 1250 ppm
  • EC: 2.5 mS/cm

Up until this point, notice that you provide more nutrients each week. That is to be expected as your plants are developing fatter buds. Do you know what else you can do to increase the size and density of the buds?

Carbon dioxide

Your plants not only consume more water and nutrients. They also need more carbon dioxide to manufacture food it needs to sustain the vigorous growth. If you choose to provide CO2, do it only during the light-on cycle.

Week 7

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.5-5.8 pH
  • TDS: 1300 ppm
  • EC: 2.4 mS/cm

By this seventh week, you notice that the flowers are getting more massive than ever. Aside from the bloom mix that you are using, you may also want to give it a little bit more potassium using a booster.

Your plants should have produced a healthy amount of pistils and trichomes. For sure, they look stunning.

Week 8

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.5-5.8 pH
  • TDS: 750 ppm
  • EC: 1.5 mS/cm

At this point, the increase in bud size slows down, but they continue to grow denser. More importantly, the resin glands keep secreting THC and other cannabinoids, terpenes, and flavonoids.

As this is the final two weeks of the flowering period before harvesting, it is also time to reduce the nutrient level. From 1300 ppm, bring it down to 750 ppm. The reason for that is so that your plants could use as much of the nutrients it had absorbed. It is normal to see discoloration, but that is no longer an issue.

Do watch out for any signs of molds. If even a tiny bit appears, cut the affected part and discard – carefully.

Week 9

  • Light: 600W HPS at 100%, 20″ from the plants, 12 hours on
  • Temperature: 75-80°F daytime, 65°F nighttime, 70°F nutrient solution
  • Humidity: 50%
  • Acidity: 5.5 pH
  • TDS: 0-500 ppm
  • EC: 0-1.0 mS/cm

The final week, or it could take a few days more. Regardless, harvest time is around the corner. What you want to happen is to wean the nutrients off the plants. You can do so by providing plain water with 5.5 pH.

The idea is so you could harvest the buds with as little nutrient leftovers. That makes the drying and curing process more efficient. As a result, you could expect cleaner, better tasting marijuana.

Keep monitoring the plants at this late stage of the game. Make sure that there are no pests or moisture-related diseases. Observe the trichomes and estimate the percentage of discoloration. Once you see that around 60% to 70% of the previously translucent trichomes have turned milky white, then harvest. It is at this point when the THC concentration is at its peak.

It is important to always maintain the best environment for a hydroponic grow before you create your schedule, the foundation is important and from there you can start following this schedule to obtain the best results!

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