How to Grow Hydro /
Hydroponic Feeding Tips

How to grow hydro is really about how to maintain your nutrient reservoir. After all, there is nothing you can do to MAKE your plants grow. You can only provide all the best conditions, sit back, and let plant growth happen. Assume your plants are getting enough light and air, and are kept at a good temperature. Plant growth will happen (often quickly) as long as you provide the best conditions in your nutrient solution (and in the rest of the grow room) everyday!

Beginning Water Quality

A tool for measuring the nutrient strength in your hydroponic system is required (in my opinion) to have good results

Learning how to grow hydro starts with your beginning water quality. Check your tap water with a TDS meter. Anything over 200 ppm and you should probably use a reverse osmosis filter, or else use bottled spring water. While not necessary, it's not a bad idea to treat your water using hydrogen peroxide.

If you really want to complicate things, you can get a complete water test. In this case, you can use tap water with up to 300 ppm as long as no more than 150 ppm of the total is from Calcium, Calcium Carbonate, and Sodium compounds.


How to Grow Hydro with
Additives and Supplements

General Hydroponic nutrients were developed in part by NASA, and for many years were the gold standard of hydroponic nutrients

Through the water, the plants will receive all of their food. This water needs to contain primary nutrients (N-P-K), secondary nutrients (Calcium, Magnesium, Iron, Sulfur), and all trace nutrients. I strongly recommend using a professional hydroponic nutrient product for this.

A quality seaweed supplement will provide a full compliment of trace nutrients plus a big bonus missing from most hydroponic nutrient regimens - PLANT HORMONES!

In addition to regular food, there are a few additives that make a huge difference in the healthy development of your plants. These are vitamins (like Thrive Alive B1), trace nutrient supplements (like Maxicrop liquid seaweed), and plant hormones (in both seaweed and Thrive Alive red). Another useful additive is Silica, which is used to boost the immune system of plants.

Vitamin B1 is not a nutrient salt, yet it drives cell division (plant growth). Use it in every drop of water start to finish!

Many expert gardening articles I have read by people who know how to grow hydro recommend adding Thrive Alive B1 and Maxicrop to every drop of water you give your plants. Use 10 ml (2 tsp) per gallon of each. If you are using a seaweed based fertilizer, it is not necessary to add additional liquid seaweed. For more information on feeding and maintaining your nutrient solution, check out the hydroponic nutrients page.

Nutrient Solution pH

If you want to learn how to grow hydro well, you must know about the pH (potential Hydrogen) scale. Hydroponic nutrients are only usable to your plants when the pH is right. The maximum amount of nutrients are available to your plants in a range of 5.5 pH to 7.0 pH. In hydroponics, the nutrients are often kept around 5.5 because the plants absorb nutrients slightly more quickly at this pH.

Maximum nutrient availability only occurs within a small range of pH, making pH control of your nutrient solution very important

Also, the natural tendency of the nutrient solution is for the pH to creep up slowly over time, so it is a good idea to adjust the pH down to the low end of the acceptable range whenever you make a pH adjustment.


Nutrient Solution Strength

One of the MOST essential pieces of equipment for the indoor garden. Use it and always know the strength of your nutrient solution

People that know how to grow hydro use a total dissolved salts (TDS) meter or an electrical conductivity (EC) meter to tell how strong or how weak the nutrient solution is. The ideal strength of your nutrient solution depends on what type of plants you are growing, and also what stage of the plant life cycle they are in. Your plants will tend to require stronger and stronger nutrient solutions as they grow more mature, and especially when they go into flowering. Check out the plant life cycle pages for more specific advice on what strength to keep your nutrient solution.


Maintaining your Nutrient Solution

A very cheap but effective way to keep track of your nutrient solution pH. If you are starting up on a budget, I recommend this instead of a pH meter

With a ten gallon reservoir feeding 10 medium size plants, you will need to check the strength (TDS or EC) and the pH of your solution at least once per day. People that know how to grow hydro usually use a larger reservoir. With a larger reservoir, the changes in the nutrient solution take a little more time. The larger reservoir acts as more of a buffer. A good general guideline to follow would be to use at least 3/4 gallon to one gallon of nutrient solution per plant. No matter what size reservoir you have, I would still recommend you check your nutrient solution at least once a day!


You should have a desired water level marked out somehow on your reservoir, and as your plants feed they will drop the level of the nutrient solution in the reservoir. Always begin by topping your nutrient reservoir up with plain water. It is a good idea to let any water that you use sit out overnight in an uncovered container. This lets the water de-Chlorinate, and also lets the water come to room temperature. Adding cold water can shock the roots, causing root damage below as well as damage and leaf drop above.


When checking your nutrient solution, it is a good idea to check the nutrient solution strength first (as opposed to checking the pH first), because the addition of nutrients and supplements to the nutrient solution will usually change the pH of the nutrient solution a little. If the nutrient strength is low, add a little more of your base hydroponic nutrients. If the nutrient strength is a little high, add plain water.


pH up and pH down allow you to control the pH level of your hydroponic nutrient solution. This kit also includes the pH indicator drops

Once the strength of your nutrient solution has been tested and adjusted, it is time to test the pH. The cheapest way to do this is with a small bottle of pH indicator drops....you just scoop up a sample of your water, add a few drops of indicator, and shake! Just check the results against the color chart on the bottle for your pH.

If you test your nutrient solution and the pH is up, then slowly add a little pH DOWN. If your pH is too low, then slowly add some pH UP.


Start Fresh Every Two Weeks

After two weeks of using the same nutrient solution, it is time for a nutrient change. The plants may have been using some nutrients faster than others, and now you might be heading for a nutrient imbalance. Keep an extra nutrient reservoir full of plain water waiting for your next nutrient solution change. This ensures you will have de-Chlorinated, room temperature water that will not damage your plants' roots.

Enzymes constantly decompose dead plant cells in the system, and also keep nutrients chemically available, preventing nutrient buildup during a grow!

It is a good idea to run a tank full of plain water (or 1/4 strength nutrient solution) through the hydroponic system for a few hours in between nutrient changes. This helps to flush out any nutrient buildup. Some experienced gardeners do this every four weeks, or every other nutrient change. The addition of enzymes, such as Hygrozyme, will help with the flushing process, and can actually be used DURING the growing process to prevent nutrient buildup in the grow media. Whenever you find your hydroponic system and plant containers empty, consider using hydrogen peroxide to keep things clean and healthy.


The Final Tweak

Once you have a simple feeding plan that is working well, you can try to maximize your results. The best advice here is to make small changes, one at a time, and to let each change show its effects before making another change. Sometimes this will mean waiting two weeks, other times it may mean waiting a whole crop cycle for the results. This is where keeping a journal for the garden can really pay off!

My experience has shown that a simple plan with high quality results is what your goal should be. Many times, experimenting only leads to bad results. Over complicating things. To make matters worse, if you changed two or more things, you have no idea what is causing the problem now. Anyone interested in a final tweak to push their plants the extra mile should learn more about these fertilizer and soil additives.


The Final Flush

Products like Flora-Kleen and Final Flush are chelators...in the presence of these substances (like Fulvic Acid) nutrients become chemically available, and easier to flush

Pros that know how to grow hydro usually do a final flush just before harvest. This can be done by replacing the nutrient solution with plain water for the last 7 to 10 days. It will help if you change the water each day with fresh, plain water for these last few days. An alternative is to use a product specifically made to help flush out these nutrients, such as Final Flush or Flora-Kleen.


One of my favorite additives. Using it to feed the resin profile during the flushing process yields flowers that taste like they were grown organically in soil!

A common mistake is to give plants just plain water during the flushing process. It IS desirable to flush nutrient salt compounds from the plant tissue, which is exactly why you do NOT want to include fertilizer during the flushing process. However, many plants continue to add plant weight and continue to develop tasty plant esters, amino acids, alcohols, terpenes, and resins right to the end.


Sweet and Liquid Karma are very comparable products. I prefer the unflavored versions of the products, which let the natural flavors of the plants shine loud and clear

Say, for example, a plant puts on the last 10% of these compounds in the last 10 days of flowering. If you are giving your plants only plain water for the last 10-14 days, you may be preventing your plants from coming to their full potential. I recommend the addition of B1 to continue driving cell division, as well as an additive that will provide esters and plant alcohol precursors, humic acids, amino acids, some carbohydrates....such as Liquid Karma (the original is my personal favorite) or Sweet. 10 ml per gallon of each is an effective rate of application, and is the rate that I use.

Flushing the crop helps remove any fertilizers in the plant tissue. Flushing properly will improve the flavor, aroma, and potency of the finished produce coming out of your garden.

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Go to the Homemade Hydro Page


Check out the Hydroponics Growing Systems page


Learn about Indoor Garden Lighting



AffordableGarden Design&Setup

(10 week update below)


Find out the cheapest and easiest ways to garden productively in this article.

Hi everyone, Jason from Jason's Indoor Guide here. When I got started with hydroponic gardening more than 24 years ago, my first garden used rockwool cubes and B.C. Nutrients....and I remember thinking to myself yeah, sure, there may be a lot of advantages to gardening with hydroponics, for example there are very few pest problems, therefore very little pest control, no weeding, no plowing or tilling the soil, no soil testing or having to add things into the garden soil, no watering the garden....but for someone who just wants to grow their own vegetables and have more control over their food supply and the quality of the food that they eat, the cost of constantly having to buy grow media and hydroponic nutrients makes this an expensive hobby for most people...


Epic Nutrient Change



I suppose when you take into consideration how much money you save NOT having to buy food at the grocery store, it is surely cheaper to grow your own food hydroponically even with the cost of high quality nutrients. Nevertheless, I didn't have a whole lot of money to work with and I needed to make my efforts as affordable and effective as possible....and in the last 24 years I HAVE learned a thing or two!

As you browse through Jason's Indoor Guide, you will notice all of the systems that I use personally are homemade systems. As I got 3 or 4 years of experience under my belt, I quickly adopted a preference to standing water systems and systems that use expanded clay pellets or lava rock, because the media is re-usable and it eliminates a huge operating expense. So once a hydroponic system is built, garden maintenance is minimal- check and adjust the nutrient solution daily, and to change it completely every 2 weeks....and the biggest operating cost is the hydroponic nutrients. (and the electric bill, lol)...


Homemade Cloner



And, regarding the cost of the nutrients....I experimented for about 3 years with making different compost teas and nutrient teas, but there is still a lot of expense $$$ associated with making high quality nutrient teas....like kelp meal, liquid seaweed, rock dust, bat guano, un-Sulfured molasses, worm castings. You can eliminate a lot of this expense by becoming an expert at making high-quality colloidal humus compost, and use your properly made compost as the basis of your hydroponic nutrient solution.

Unfortunately, I have been gardening for over 24 years and I have only just recently mastered this difficult skill....and even then, only because I happened to find a very easy to follow, high quality technique and decided to follow the instructions to the letter. I produced more high quality compost in just one week than I was able to use in a whole year! If you can master the technique, I highly recommend it. It is one of the top 3 things you can do to increase the productivity of your food production efforts, while at the same time decreasing the amount of effort required to grow all of your own food, and decreasing the total cost of operating your food production system.

And when I say decrease operating costs, I mean decrease them to almost ZERO, especially if you are producing your own nutrients...



High Efficiency
Hydroponics

The ultimate solution to eliminate the cost of your hydroponic nutrients: Imagine a hydroponic system that does not require you to buy any nutrients, does not require you to make your own compost, and does not require you to brew your own nutrient tea. Seriously! No cost and no effort as far as providing nutrients to your plants! Plus, at the end of the gardening cycle you harvest all of your garden vegetables, PLUS YOU HARVEST FISH from the system--->

Aquaponics

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This solution is aquaponics. If you are serious about producing all of your own food and being self-sufficient, this is the ultimate solution for reducing expenses (as much as possible), reducing the total amount of work required, and maximizing the productivity of your gardening efforts. I have been gardening for over 24 years, and it is the perfect food production solution in my opinion.


Produce garnden vegetables AND fish together. Eliminate fertilizer costs!

Besides mastering how to make high quality compost, learning aquaponics is one of the top 3 things you can do to increase your garden productivity, reduce your total costs, and reduce your total work. The product that I learned from is called Aquaponics4you. With all of my hydroponic gardening experience, the first time I came across the Aquaponics4you product I knew immediately that it was something very special! Place an aquaponics system outdoors and use the sun instead of grow lights, and you have reduced every garden expense to nearly ZERO!



The Same System/ 10 Weeks Later!




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