This is Part 2 in The 3-Legged Stool of Successful Grow Operations series. Click here to read Part 1 and stay tuned for Part 3 coming next week.
Aeroponic and hydroponic systems use zero-soil, so water is effectively our media and our transport mechanism for nutrition. Ideally, you start with clean, fresh water with “nothing” in it. Nothing in this case means no heavy metals, pesticides, bacteria or pathogens. There are some scary words in there so let’s talk through the best ways to get to “nothing.”
The first place to start is by testing your source water, whether it is surface, well or municipal water. This will give you an initial idea of how “empty” your water is. Water supplies shift over time, so it is also a very important input to monitor over time with annual or bi-annual testing. Clean water is the essence of success for aeroponics and a great way to lower your cost of production. With proper design and management, you can recycle and reuse 95%+ of the water you draw into your facility.
Reverse Osmosis (RO)
Mothers to clones: Happy clones, it’s all about the water
RO is the most common way to clear your incoming water. The process uses pressure filtration by forcing your water through a series of filters or meshes that block or extract large particles, organics and metals. Normally this is 98%-99% efficient. These systems do require attention and maintenance as they do have filters that are required to be changed regularly depending on the clarity of your original water source and the type of material filtered. This accomplishes a lot of your water clearing process to empty the balloon, but it does not clear the pesky biologicals or pathogens. RO is covered in detail in our “You are what you drink” webinar so look that over for a deeper explanation. There are a wide range of relatively low-cost suppliers based on capacity and filtration efficiency. From an operations standpoint, the key is to understand the filter replacement cycle and cost of replacement.
Ultraviolet Light (UV)
UV light can be used to clear organics and pathogens from water. The primary use is to clear origin water but it is also especially important for recovered water that you save from the humidity in your grow rooms. More on this below. One has to be cautious about the use of UV light. It will cause sunburn and eye damage with exposure so handle this resource with care. After RO & UV treatment, input water should be an empty balloon ready for the addition of your perfect nutrient salt recipe. There are a wide range of low-cost UV lighting solution suppliers from which to choose and they are easy to find.
Dehumidification & Recovery (DEHU)
Early root follicles: Reaching for first nutrients
The number one way to conserve water in an accelerated growth aeroponic grow room is to recapture the humidity that is transpired into the air as the plants grow. While DEHU water is effectively distilled water (or clear of particulates), it can be full of healthy little bacteria or pathogens than may be transported through air or residing in the equipment filters. Clearing these with UV light normally makes this water directly reusable in your fertigation systems. Not all dehumidifiers are perfect. Some metals used in their construction can leach into the recovered water, so this is worth a deeper look as you create your complete water system. Air treatment suppliers are covered in Part 1 of this series.
Used Fertigation Water, or “Flush”
At the start of the flower cycle, take your clean water (the empty balloon) and add your perfect nutrient salt flower recipe and deliver it to your plants. Over the grow cycle from flower to harvest, your plants will use portions of your nutrients and your balloon contents will drift from your target recipe you’re your desired cycle, clear or flush your reservoirs and reset your recipe by refilling your balloon to your exact targets. The exiting nutrient-rich “flush” water can also be recycled into your source water feed since the salts and metals present can be cleared from the mixture through the same RO process that your source water goes through. The end result is perfectly good recycled water savings.
Oxygen Reduction Potential (ORP)
Healthy roots reach for water: Early veg when plants get rolling
ORP is a measurement of an oxidizing agent. Oxidizing solutions are a common and inexpensive method of disinfecting water before and during use in hydroponic systems. Oxidizers can be used to monitor and deal with the “cleanliness” of a nutrient water solution while it is in use. Several oxidizing agents exist with the most common being: hydrogen peroxide, chlorine, ozone and chlorine dioxide. The characteristics of each of these agents and how they interact with the organic matter in solutions is different. The ideal concentrations to use in each situation to kill or control pathogens is unique and one of the topics covered by our “Letters from the AEssenseGrows plant science team” on our website. That deep dive is the subject of another paper.
When you take all of these subjects together and they are done right, you should be able to recycle 95% of your source water with a professional water treatment & recycling system.
Here, I would like highlight the ultimate water hero: Ashley Hubbard, director of cultivation at RAIR Cannabis. For a quick tour of her water treatment and recovery room, see here. No one that I know manages water better than RAIR Cannabis and Ashley leads the team there.
Having a well-built grow room with adequate lighting, the ability to properly control the environment, proper nutrient feedings, a good pest management plan, well trained employees and an experienced cultivation manager are very important to the overall output of cannabis plants. However, even if you have all those measures in place, there’s no guarantee of success. One factor that is often overlooked is how many harvests you can get per year, as clearly the more harvests you can get in a given time period, the more likely your chances of success are in this competitive industry. This is why having a good cultivation plan in place, with proper foresight and planning, is so essential to success.
Increasing yield or production output in a cannabis cultivation facility can often be as simple as having the right cultivation plan in place to ensure that you are harvesting the maximum number of times per year. All it requires is a well thought out plan, and best of all, that does not cost any money if you have someone with enough cultivation experience assisting you and will earn back more than the cost of paying a consultant to get such a plan in place.
In this article I will explain why changing nutrients, grow media or even a cultivation manager may not necessarily increase yield, quality or your chance of success. What you should be focusing on is your cultivation plan and the scheduling of your cultivation cycles.
Why changing nutrient companies may not necessarily increase your yield
Nutrient dosers are used to inject fertilizer directly into irrigation lines
For the most part, nutrient companies use the same ingredients in their product lines and often buy them from the same source, but they combine them in different forms and ratios to create their “unique” product. You can go to a grow store, pick five different nutrient products, read the labels and compare the different nutrients in each one. You will find for the most part that they are very similar. Generally speaking, you could pick any one of those five nutrient companies and have great results. Mixing nutrients into a nutrient tank needs to be done precisely and if your employees are not doing it properly this can lead to plant health issues. In larger cultivation facilities, often nutrient dosers are used to inject fertilizer into the irrigation lines without having to mix nutrients. However, if the dosers are not set to the proper ratios, this can also lead to plant health issues.
There are a few companies that I really like that have a different approach to plant nutrition, which saves time and can prevent human error associated with mixing and applying liquid nutrients. Soilscape solutions, Organics Alive and Beanstock Agriculture all have nutrient lines that are intended to be used with soil or soilless media that can be amended into the soil which provide a slow steady release of nutrients that the plants can uptake as needed. This avoids the risk of human error in repeatedly applying liquid nutrients to the plants.
Why changing grow medium and nutrients will not necessarily improve your yield but may increase yourquality
Whether it is rock wool, coco fiber, a soilless mix or living soil, everything has a limit. Giving your plants the proper amount of water and the frequency at which you water, along with having sufficient room for the roots to grow are key factors to ensuring plant health. If your plants aren’t getting watered properly, no matter what media you are growing in, you will be having problems. Changing things like grow media won’t result in instant success, as there will always be a learning curve when making changes to your cultivation. If you cannot adapt quickly enough, you can quickly create major problems.
Changing things like grow media won’t result in instant success, as there will always be a learning curve when making changes to your cultivation.
You would be better off to master the grow media you are currently working; you will have more chance of success making slight alterations to your current media than you will if you switch your grow media altogether. There are so many different nutrient lines, soil companies, coco coir companies and the truth is any of them can lead to success.
Changing grow media and nutrients do play a large role in quality though. With cannabis being legalized in many states, the overall quality of cultivation inputs have increased, especially nutrients. However, in general, with some exceptions, the quality of cannabis has not necessarily increased along with the increase in quality of nutrients. One exception: I would argue that switching from salt nutrients and rock wool, to organic living soil will result in an improvement to the flavor, quality and terpenes of the cannabis.
A lot of people use rock wool with salts because it’s easier to scale up than if you are growing in soil, but some quality is also sacrificed. Soil is heavy and messy and most people throw their soil away which takes a lot of money and labor to do. Reusing your soil is one of the best ways to save time, money and increase quality. I had a friend that grew the same variety, same lights, same ventilation but grew hydroponically with salt-based nutrients and he would always say the cannabis I grew, organically, tasted better. The same was true when we grew the same variety outdoors. He used salt-based fertilizer, I used amended soil with water. There wasn’t really a comparison in flavor and the yield was not compromised either! This was his opinion not mine.
I think the vast majority of consumers have not seen the type of quality that someone in Northern California who has been smoking and growing for 20 plus years has seen. Quality is relative to what you have been able to acquire. Most people especially nowadays will never see the quality that used to be common when we didn’t treat the sacred herb like a commodity. When you do it for the love of the plant it shows. Remember, quality is relative to your experience and if salty weed is all you know, you are probably missing out.
Why changing your Cultivation manager may not necessarily increase your yield
Every cultivation facility should have an experienced cultivation manager who is knowledgeable in the areas of nutrient requirements, pest management, environmental requirements, managing employees and overall facilities operations. If a grow room cannot sustain the proper environmental set points, blaming the problems and issues that arise on the cultivation manager is not fair. It is a common problem in the cannabis industry – the owners of a company are not seeing the results that they want and think that by replacing the cultivation manager it will solve all their problems. In reality, often the problem results from upper management or owners of the company not providing the cultivation manager the tools necessary to perform their job at the highest level. Another common problem is when owners fire the cultivation manager and replace them with lower-level employees to manage the facility. The problem with this is those employees do not have enough experience nor the attention to detail to successfully run a cultivation facility. The result is that yield and quality suffer tremendously.
You should be harvesting every 60-70 days
If you are cultivating strains that finish flowering in 60 to 70 days you should be getting five harvests per year.
The reality is there is no one specific thing you can try or buy that will result in success. It is everything combined, the HVAC system, lights, genetics being grown, water quality, air quality, root zone temperature, ability to control environment, having a clean facility, disease free plants, knowledgeable cultivation manager etc. that are required to operate a successful cultivation.
But all of that is less important to yield than a good cultivation plan. Cultivation methods directly tie into the overall production of a facility. But, regardless of whether you’re growing in soil, hydroponics, using LED or HPS, have low or high plant counts, if you don’t have the ability to harvest a grow room, clean and replant within a very short amount of time (ideally one or two days) then you’re going to be losing out on profit.
If you’re cultivating strains that finish flowering in under 60 days you should be getting six harvests per year. If you are cultivating strains that finish flowering in 60 to 70 days you should be getting five harvests per year. To do this, you will need to have the appropriate amount of plants that are ready to be flowered to refill your grow room or greenhouse ready to flower. With a little bit of planning and foresight you will be able to do this, and you will be on your way to producing your highest yield potential.
If you are struggling to have enough plants that are ready to flower once you are done harvesting and cleaning your grow room, having trouble planning your cultivation schedule to maximize production, or struggling to maintain a mother and clone room to supply your own plants or planning for the appropriate amount of labor, contact Floresco Consulting and talk with one of our cultivation advisors to get you back on track. We can guide you to ensure you are harvesting, cleaning and replanting every 60 days. Contact us today to get your facility producing at its maximum potential.
Before you begin any large-scale cultivation project, you must necessarily consider the four factors highlighted below, among many others, to ensure your cultivation is successful. Failure to do so will cost you greatly in both time and money, and ultimately could lead to failure. While the four areas highlighted below may be the most important considerations to address, you should hire a cultivation advisor to determine the numerous other considerations you must deal with before you begin.
1. Genetics
Genetics will play a huge role in your cultivation plan, as they can ultimately make or break the success of your business. Access to quality, verified genetics will greatly affect your profits. All cannabis genetics grow differently and may require different conditions and nutrients. Further, consumers in today’s regulated market have greater awareness; they are much more knowledgeable about genetics and able to discern between quality cannabis versus commercially produced cannabis.
Market trends will dictate whether or not you’ll ultimately be able to sell your harvest at market rate. You need to project out at least one year in advance the genetics you will be growing. But often it is impossible to predict what consumers will be purchasing a year in advance so this part of your cultivation plan should be well thought out. Further compounding this difficulty is the fact that it may take six months to ramp up production of any given variety.
Genetics that are popular now may still be popular next year, but that also means there will be more competition for shelf space, as more competitors will also likely be growing these same genetics. Therefore, don’t rely on only one trendy variety as the bulk of your selection for the year, no matter how popular it is at the moment. Producing a single variety as the bulk of your crop is always risky, unless you have a contract with a sales outlet, in advance, for a set quantity of that one particular variety. Diversity in your genetics is beneficial, when chosen correctly.
Making proprietary genetics from your own seed collection can give you a big advantage in today’s competitive market. Having a variety with a distinct, unique and desirable smell, taste, effect or cannabinoid profile will allow you to distinguish your brand amongst others. Entire brands have been built off of a single variety: Cookies and Lemontree are two examples of companies that have done this. All it takes is one really good variety to attract a lot of attention to your brand. Having your own breeding project on site will allow you to look for and identify varieties that work for you and your business model, and ultimately will help to distinguish your brand apart from others.
Only buy seeds from reputable breeders! Any new varieties that you are going to be cultivating should be tested out at least three times, on a small scale, before being moved into a full production model. If you are growing from seed there is always the potential for your crop to get pollinated by male plants or hermaphrodites that went unnoticed, and therefore, they could be a potential risk to your entire harvest. Treat them accordingly, i.e. by cultivating them on a small scale in a separate, enclosed area.
Buying clones from a commercial nursery can be risky. Genetics are passed from one grower to another haphazardly, and names are changed far too easily. This can create a lot of confusion as to what variety you are actually purchasing and whether you are getting the best version of the genetics. Just because a clone is called “sour diesel” doesn’t mean you’re actually getting the real, authentic sour diesel. And to further complicate things, the same clone grown in different environments can produce a noticeable difference in flavor, smell and effect depending on your cultivation method. Always try your best to verify the authenticity of the genetics you purchase. Ask about the history and origin of the particular genetics you are purchasing. Better yet, ask for pictures, physical samples, and most importantly, certificates of analysis from a laboratory, indicating the potency. In many states anything under 20% THC is going to be hard to sell, while anything over 30% will easily sell and command the highest price. It’s a good idea to have a laboratory test the terpene profile in order to verify a variety is actually what the seller purports it to be.
Knowing the source of your genetics is imperative. It will help ensure that you actually have the variety that you were intending to grow, and therefore, allow you to achieve your intended results. Knowing what varieties you are going to cultivate, before you grow them, will also give you a better idea of the ideal growing conditions for that specific variety, as well as what nutrients will be required to achieve optimum output.
2. Automated Watering Systems
Installing an automated watering system, during build out, will by far be the most cost-effective use of your money, and will save you the most amount of time in labor. An automated watering system, commonly referred to as a “drip system” or “drip irrigation,” is necessary regardless of whether you are cultivating indoors or outdoors; it will allow you to water multiple different areas at once, or only water a few specific areas of the garden at one time. Hand watering a 22,000 square-foot cultivation site will take one person eight hours every single day, on average, to maintain. However, a properly designed drip system can water an entire large-scale garden in a couple of hours, without any employees, record all the relevant data and notify you if there is a problem. This enables you more time to spend closely inspecting the plants to ensure there are no bugs or other problems present, and that your plants are healthy and thriving. This attention to detail is necessary if you want to have consistent success.
Larger scale cultivation requires bigger and more expensive equipment.
Automated watering systems not only save a great deal of time but also eliminate the possibility of human error, like over watering, which can kill an entire crop quickly. There aresoil moisture sensors that can be placed in the soil to regulate the supply of water to the plants in a precise manner. Without an extremely skilled, experienced work force, damage to plants due to over watering is very common. A drip system will reduce the threat of human error by ensuring delivery of precisely the correct amount of water and nutrients to each plant every single time they are watered.
Not all drip systems are created equally. There are different types of automated watering systems. Designing the right drip system for your cultivation site(s) can be complicated. Make sure you do your research, or better yet, work with a cultivation advisor who has experience with automated irrigation systems in conjunction with a licensed plumber, to ensure you are installing the best system for your particular set up.
Adding a fertilizer injector to your drip system can further increase the efficiency of your operation and save you money on nutrients by using only what you need and ensuring correct application. Again, automating this process will save you time and money, and reduce the threat of human error.
3. Nutrients
The types of nutrients you use and the amount of nutrients you use, are going to directly affect the quality of your cannabis flower. Conventional agriculture and Dutch hydroponic cannabis cultivation have always used salt-based fertilizers. However, they can be toxic for the plant in high amounts. While cheap and easy to use, salt- based nutrients are made in big factories using chemical processes to manufacture. They are not good for the environment, and overall, they produce an inferior product. The highest quality cannabis, is grown with organic living soil. Although seemingly contrary to popular knowledge, when done properly, cultivating in organic living soil is more cost effective than using powdered or liquid salt-based fertilizers.
Yield and quality depend on the skills of the cultivator, more than the method they are using. Having healthy plants from the start, will always yield better results, no matter what way they were grown. In my 20 years of experience I have seen plants grown in balanced living soil yield just as much as plants grown with synthetic nutrients. Further, the quality is not comparable.
Controlling your clone supply can ensure they are healthy
Always remember, it is the quality of your flower that will determine the price it is sold for, not the yield. Even if you produce more overall weight of chemically grown cannabis, if nobody wants to purchase that product, then you are going to yield far less profit than another company growing in the same amount of space using organic practices that yield a higher quality product.
The difference in quality between plants grown in balanced living soil versus any other method of cultivation is undeniable. It is really easy to post a pretty picture of a flower on Instagram but that picture doesn’t tell you anything about what went into producing it. When flower is produced using chemical nutrients, it is likely going to be harsh and not enjoyable to smoke. Lesson learned: don’t judge a bud by an Instagram photo! There is a stark difference between cannabis grown using synthetic nutrients versus cannabis grown in living soil. Once you’ve experienced the difference you will never want to consume cannabis that is grown any other way.
4. Plant Propagation
Having the ability to propagate your own clones, from mother plants that you have cultivated, can save you a staggering amount of money. In some states, having a cultivation license allows you to produce your own clones for your cultivation, while having a nursery permit will allow you to sell clones for commercial sales to other companies. The average price of a wholesale clone is around eight dollars. If you require 5000 plants for every harvest, that’s a $40,000 expense you must bear, every grow cycle. This can obviously add up quickly. And as previously mentioned there’s the risk of purchasing inferior genetics or unhealthy plants, both of which greatly affect your profit margins.
On the other hand, the cost of materials and labor to produce a healthy clone can be as low as one dollar when using advanced cloning techniques. Controlling your clone supply can ensure they are healthy and allow you to know exactly what you are growing each time. Further, it doesn’t take a lot of space to propagate your own cuttings. In a 400 square-foot space one could produce between 5,000 to 10,000 clones per month, all of which could be maintained by one person depending on your situation.
And last but definitely not least, the most important thing you can do to ensure the success of your cultivation, is hire an experienced knowledgeable grower who is passionate about cannabis. The success of your company depends on it. You need someone with the knowledge, experience, and skills to make your cultivation dreams a reality. You need someone who can plan your build-out and cultivation to ensure success from the start. And you need someone with the skills to handle the multitude of inevitable problems that will arise in a cost effective and efficient way.
These are just some of the many considerations you must account for when planning a large scale grow in the regulated market. An experienced cultivation advisor can help you with these, and many other considerations you will need to contend with before you begin your grow. Creating a well thought out plan at the outset can end up saving you thousands, if not hundreds of thousands of dollars down the road.
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