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Growing Food the Kratky Hydroponics Way

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Growing Food the Kratky Hydroponics Way

Growing food is becoming a priority for more and more people. Homegrown food tastes better, is healthier, and is a lot more affordable. However, you might not be so lucky to own land or the land you own is frozen half of the year. Growing food the Kratky Hydroponics Way is one of many ways to grow food without land. If you are interested in hydroponics but are not ready to invest in a complex setup just yet, then the Kratky method might be the one you want to explore.

What is the Kratky hydroponic method?

B. A. Kratky from the University of Hawaii discovered this non-circulating hydroponic growing method that does not require any pump or air stones and no electricity at all.

A plant needs light, water, nutrients, and oxygen to grow. The Kratky method provides all this in a very simple way. You add water with all the mineral solution needed into a container with a net pot and some rock wool (or any growing medium of your choice), plant your seed, and let it grow. See how to plant a hydroponics garden here.

Growing Food the Kratky Hydroponics Way

As the plant grows, it will “drink” the water. The gap will be filled with moist air, providing the roots with oxygen.

Growing Food the Kratky Hydroponics Way

By the time the plant used up all the water, it is ready to be harvested. For plants that need longer to mature, just keep the container filled about half full. We will talk about an example later.

What will you need to grow food the Kratky hydroponics way?

Additional light for an indoor edible window garden

-A container to grow in. Any watertight container will do. It is good to choose a container that does not let light through to prevent algae from growing (see picture above, the water is green because of algae).

The container can be of any size for as many plants as you want to grow, meaning if you want to grow a small plant and just one you choose a small container, if you want to grow a dozen plants you obviously will need a bigger container. Also, for the Kratky method, all the plants in one container have to be of the same variety and at the same stage of growth.

For example, one lettuce needs, give or take 1 gallon of water with a nutrient solution in its lifespan. A milk jug would work for it. If you want to grow 3 lettuce plants, set and forget till they are done, you will need a 3-gallon container. Or, as I explain below, you can also use a smaller container and refill it.

Bigger plans will need more nutrient solution, a pail, a rubber box, or whatever you have on hand can be turned into a growing container. It is just like container gardening, except these containers need to be able to hold liquid. I also like to use a nice potting pot, add a lid and grow in there, looks decorative too.

An opening in the plastic lid can easily be cut out to fit the net pot. Alternatively, a lid can be cut out of styrofoam and the bucket wrapped in black material to prevent light to come through (See picture below).

This is the first post of many to come about indoor edible window gardening. Grow food year-round at any weather following these simple and proven techniques.

-A Mesh Net Pot. We like the two-inch in diameter, but you can get them in different sizes.

-Growing medium, we use Rockwool.

-A hydroponic solution, we like the General Hydroponics MaxiGro. It is simple to use and works for all kinds of green plants. Read more about it below.

–Ph Control Kit, to ensure the proper balance of nutrient solution.

-Seeds. Read more below on what to grow in the Kratky method.

Hydroponic Fertilizer

You can use whatever nutrients brand you want or is available at your local supplier. We prefer dry concentrated nutrients. General Hydroponics MaxiGro is a simple product to start and what we use. The green is for green plants like lettuce and also to start fruit-bearing plants like cucumbers.

General Hydroponics Flora Grow, Bloom, Micro Combo Fertilizer set is a liquid solution for all stages of growth.

General Hydroponics Ph Control Kit helps you to keep the PH at 5.5-6.5.

What to grow the Kratky hydroponics way

The simplest and most effective plant for the Kratky hydroponics method is lettuce. You need one gallon of the solution and can plant and forget it till harvesting time. But lettuce is not the only plant that can be grown. Any above-ground plant can technically be grown the Kratky hydroponics way.

Depending on the size of the container, it might not be all that set and forget. Bigger plants need to be refilled, making sure that the container stays about half full, allowing the roots to have lots of oxygen.

In our experience, the Kratky method works well for fast-growing plants. It works great for cucumbers, they grow fast, produce and die back, now you can start new once. Also if you want to grow tomatoes, choose a determinate, early variety.

Here a Kratky hydroponics cabbage plant in our laundry room window. It was more fun than food, to be honest, but sometimes an experiment is worth it.

Kratky Cabbage - Winter Garden Update 2016

Here Kratky method basil in our kitchen window. We started the basil from a cutting, and it grows in a recycled glass jar, that stays in an ornamental hanging pot. Kratky hydroponic can be nice, too ;).

Growing Food the Kratky Hydroponics Way - Basil

Here a tomato trial. So far we are impressed. However, growing tomatoes might be better in aeroponic than in a non-circulating hydroponic. Still, if that is all you can afford, go for it. In 12 weeks the plant shows remarkable growth and has set fruit, too.

Growing Food the Kratky Hydroponics Way - Tomato

For fruit-bearing plants like tomatoes, you can start with a smaller container and fill it with a solution using the green fertilizer.

Transfer it into a bigger container when the plant outgrows the small one, and start adding the fruit fertilizer. Remember the plant need oxygen, so if you want to keep growing without any electricity just the Kratky way, make sure the roots are half in the air, meaning the container is not filled to the top with the solution water blend.

Kratky Tomato

Keep refilling the container with water or nutrient solution as needed always making sure there is air, and water solution available.

Start growing food the Kratky hydroponics way today! It is a simple and fun container gardening method suited for off-the-grid and water-saving growing. As all growing, it starts with planting, read also Planting a Hydroponic Garden.

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Grow an indoor edible garden

Kratky hydroponic is a great way to grow food indoors in any weather. Read more about growing food indoors:

Starting Seeds Indoors

Starting Seeds Indoors

Trouble-shooting in an Indoor Edible Window Garden

Troubleshooting in an Indoor Edible Garden

Start growing food the the Kratky hydroponics way today! It is a simple and fun container gardening method suited for off-the-grid and water saving growing.

Growing Food the Kratky Hydroponics Way

Temperature and humidity for an indoor edible window garden is important. You want to adjust what you grow to how warm or cool your room is.

Temperature for an indoor edible garden

Additional light for an indoor edible window garden

Additional light for an indoor edible window garden

What to Grow in an Indoor Edible Window Garden. Over the years we have grown a whole lot of plants indoors at a window: Microgreens, herbs, Aloe Vera, strawberries, lettuce, winter greens like kale, root vegetables like carrots, winter vegetables like broccoli, summer vegetables like tomatoes and even water melons.

What to Grow in an Indoor Edible Garden

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

N.F.T. Downspout Hydroponics Setup

Growing an indoor edible garden in soil

Growing an indoor edible garden in soil

Planting a Hydroponic Garden

Planting a Hydroponic Garden

Preventing birds from flying into windows

Preventing birds from flying into windows

Fresh and dry basil in the winter

Growing and Preserving Basil

Growing Lemon in cold climate

Lemon tree in the indoor garden on Video

Why we heat the indoor garden with electricity

Why we heat the indoor garden with electricity

Indoor garden update fall/winter 2019. See our newly renovated indoor garden at the back of our old garage. It's a four-season growing room.

Indoor Garden Update Fall/Winter 2019

NFT downspout Hydroponics system upgrade

NFT downspout Hydroponics system upgrade

High Pressure Aeroponics

High Pressure Aeroponics Guide

Growing Microgreens and Baby Salad Greens

Growing Microgreens and Baby Salad Greens

Garden Update - Winter 2019 on video

GARDEN UPDATE – Winter 2019 ON VIDEO

An Alternative to a Passive Solar Greenhouse - Indoor Window Garden

An Alternative to a Passive Solar Greenhouse – Indoor Window Garden

Controlling aphids with No-Pest strips

Controlling aphids with No-Pest strips

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Filed Under: Gardening, Growing, Hydroponic Gardening, Indoor Garden Tagged With: Container Gardening, Gardening

Reader Interactions

Comments

  1. Alli says

    at

    I always learn so much about gardening when I read your posts. I like the idea of growing salad the hydroponics way and forgetting it until time to harvest. I agree, food is so much better when you grow it yourself. I’m going to try this.

    Reply
    • Anna says

      at

      I am glad to hear you do :). Hope the salad grows well for you!

      Reply
  2. Jennifer A says

    at

    I didn’t know it could be so simple! My husband and family are building an aquaponics farm, and that is not so simple, but fun to experience. Thanks for sharing on the Homestead Blog Hop!

    Reply
    • Anna says

      at

      Oh, good for you to start an aquaponics farm! And yes, hydroponic can be very simple.

      Reply
  3. Amanda says

    at

    This is so cool! Learning to grow with hydroponics is on to do list. And I’m going to turn to your blog for directions when I’m ready.

    Reply
    • Anna says

      at

      I love your beautiful, big garden Amanda. It will keep you busy for a while. And whenever you are ready, we are here.

      Reply
  4. Kristen from The Road to Domestication says

    at

    I haven’t heard of this particular method of hydroponics, but it looks like the results speak for themselves!

    Reply
    • Anna says

      at

      They do, and it is so easy to do.

      Reply
  5. Zan says

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    Had no idea you could grow plants this way – have never heard of it. The tomato plant is amazing. Maybe I should try this in this “up-and won- don’t know when to plant” type weather we have here.

    Reply
    • Anna says

      at

      That kind of weather is the main reason we grow hydroponically, too ;).

      Reply
  6. Cedric Fisher says

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    Do you do this outside in the summer too?

    Reply
    • Anna says

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      We don’t, however there is no reason you could not. Just make sure your water does not overheat. Also the lighting outside is more intense, you would need to protect the bucket from light so algae does not overtake.

      Reply
  7. Diane S Lynch says

    at

    Love what you said about this type of gardening. We will be and we hope to be successful this Spring!

    Reply

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