The Science Behind the EarthBox® Gardening System
The EarthBox® gardening system is a unique, sub-irrigated planter that allows the average home gardener—anyone from 4 years old to 94 years old—to grow a multitude of vegetables, herbs, and fruit without having a traditional, in-ground garden. It’s no secret that growing in the EarthBox® leads to a bountiful harvest; but have you ever wondered just what exactly makes the system work so well?
All About Gardening Basics: What’s in the EarthBox® Gardening System
It starts with four main components—the EarthBox® container, aeration screen, water fill tube, and mulch cover—proudly made in the USA from food-safe plastic; which is UV-stabilized to prevent fading and wear-and-tear, even with long-term sun exposure.
EarthBox® Container
The container itself comes in a variety of colors and is UV-stabilized, BPA-free (#5 plastic); and boasts integrated caster sockets, a wide-mouth overflow drain, angled fill tube support, aeration screen supports, 3-gallon water reservoir, and two wicking chambers—these features set the foundation for a properly-working growing system
Aeration Screen
The aeration screen is the divider between the water reservoir and the growing media. Aligning with the wicking chambers, the screen rests in the supports around the inside perimeter of the container, and provides an air space between the water and underside of the screen. Small holes in the screen allow the roots of plants to obtain oxygen, which helps prevent root rot.
Water Fill Tube
Plants are always watered through the water fill tube, which leads directly into the reservoir. The integrated overflow drain in the container prevents over-watering. Once the reservoir is full, any excess water will flow out. The two wicking chambers in the corners of the container are packed with growing media and meet the water reservoir to promote natural wicking. Wicking occurs and the roots draw water from below to nourish the plants.
Mulch Cover
The mulch cover is a black and white reversible cover made from durable agricultural film. It is one of the most important elements of the EarthBox® gardening system that serves several critical functions to control and protect the system’s environment:
- Keeps rain out of the growing media to prevent crucial nutrients from being washed away.
- Prevents evaporation and conserves water.
- Stops weeds from transplanting in the system; which would otherwise compete for space, water, and nutrients against your plants.
- Helps deter insects and other pests from burrowing or digging in the growing media.
- Depending on the climate and which color is face up, the mulch cover helps to attract or reflect sunlight. This assists in controlling the temperature of the growing media. Use the white side up in hot, dry climates to prevent young seedlings from dying; or in contrast, help warm the soil to stimulate growth by using the black side up in cooler climates.
Two mulch covers are included with each EarthBox® gardening system and Replant Kit: one to grow, one for snow. Properly winterizing your system at the end of the growing season will make it easier to replant in the Spring.
The Perfect Growing Recipe: Required Nutrients to Grow Healthy Plants
Just like people, plants need proper nutrition to grow big and healthy. The ideal blend of nutrients for plants to grow consists of three essential ingredients: growing media, dolomite, and fertilizer.
Growing Media
Plants require a healthy substrate to grow in, with just the right pH level. While the EarthBox® gardening system employs a similar technique to farming, traditional topsoil just won’t cut it in the system. By purchasing and using a sterile commercial growing medium, you are guaranteeing a safe environment for your plants to grow in, free from soil-borne diseases and pests. A Sphagnum Peat-based potting medium is recommended since peat acts as a sponge, absorbing water to deliver to thirsty plants. Commercial mixes typically have vermiculite (shiny flake mineral) and/or perlite (small white mineral) mixed in to allow for proper aeration and drainage so the mix does not become overly saturated. The right type of substrate for growing vegetables in containers does not contain rock, clay, sand, or topsoil.
Dolomite
Dolomite is limestone that is mined from the earth. This mineral is comprised of calcium and magnesium—and, when added to your growing medium—helps raise the pH level of naturally acidic peat. Calcium and magnesium are both required elements for growing healthy fruit, and help prevent the development of Blossom End Rot (BER) on the fruit of tomato and pepper plants.
Fertilizer
Fertilizer is food that helps the plant grow. Commercial fertilizers in the United States are required to be tested and provide a guaranteed analysis. The analysis lets the gardener know the N-P-K concentration; which stands for nitrogen, phosphorus, and potassium.
- Nitrogen: Responsible for the growth of foliage. Using a high-nitrogen fertilizer will result in a lot of green growth; which is great for growing lettuces, herbs, field greens, etc.
- Phosphorus: Responsible for flowers and fruit development, as well as root growth. Using a high-phosphorus fertilizer will help the plant develop strong roots, develop flowers, and set fruit; which is excellent for growing tomatoes, peppers, eggplant, etc.
- Potassium: Responsible for the general health of the plant. Using a high-potassium fertilizer will help the plant’s overall functions.
Using a dry, granular fertilizer with N-P-K between 5-15 is ideal for use in the EarthBox® gardening system. Some commercial growing media already contain fertilizer, but—due to the low concentration—additional plant food should be added during planting per the EarthBox® instructions.
Let's Get Growing!
Once all these elements are put together in the system, the plants are able to take water and nutrients—which help them grow and produce. While the EarthBox® gardening system can grow many varieties of plants, we recommend only growing one type of plant per EarthBox® system, and sticking to the EarthBox® Plant Placement Chart. Due to the nutritional requirements and maturation size of different plant types, adding too many plants will result in a decreased yield, due to competition for resources. Less is more.
Thirsty plants receive water as it moves up through the dry growing media by the principle of capillary action. Capillary action involves two important properties of water—adhesion and cohesion. Adhesion is the force that holds individual molecules of water together, and cohesion is the force that makes water molecules stick to other surfaces. Water begins adhering to small particles of the growing media and slowly works into small spaces between the growing media particles. As water adheres to the particles, cohesion allows for continuous drawing of water from the reservoir. Eventually, all the growing media becomes moistened and the plants can use as much water as they need. As the plant absorbs the water, more is pulled from the reservoir as transpiration takes place. Keeping the reservoir full ensures the plant will always have the right amount of water; never too little, or too much.
Fertilizer and dolomite provide plants with nutrients that are necessary for plant health and function. Just as water is drawn up, nutrients are pulled down. Water and fertilizer molecules diffuse or move from areas of high concentration to areas of low concentration. The fertilizer is concentrated, so it is good for the entire growing season, providing adequate nutrition to the plants.
Accessorizing Your Garden
Depending on your needs and your plants’ needs, your growing system may require additional accessories for support or watering. Different accessory items, such as casters, Garden Stands, Staking Systems, and the Automatic Watering System (AWS) make the growing experience more maintenance-free.
Caster Kit
Casters are optional, but are recommended for gardeners wishing to extend their growing season by bringing the system in and out of their home or garage during cooler nights; or for anyone with a shaded yard who may wish to “chase the sun.” The EarthBox® Caster Kit provides a set of four casters, two of which have a built-in lock to help secure your garden in place. The casters may be placed directly in the sockets on the bottom of the system, in the legs of the EarthBox® Garden Stand, or in the outrigger feet of the EarthBox® Staking System (two additional non-locking casters are provided with this product).
Staking System
Help your garden reach new heights with the EarthBox® Staking System. This provides a supportive trellis for tall and vining crops such as tomatoes, cucumbers, melons, winter squash and more. By allowing plants to grow vertically—not only are you saving space—plants can get more airflow and stay off the ground away from pests. Casters can be used on this item, so mobility is maintained
Garden Stand
Recommended for elderly gardeners, or those with chronic back pain, the EarthBox® Garden Stand elevates your gardening system to a comfortable height. Low-growing crops, such as lettuces and herbs, can also be raised off the ground away from hungry critters with the Garden Stand. Casters can be used on this item, so mobility is maintained.
Automatic Watering System (AWS)
Thirsty plants, such as tomatoes, require a lot of water when growing. It is not uncommon for two mature tomato plants to drink 6-10 gallons of water per day! The EarthBox® Automatic Watering System (AWS) delivers a constant supply of water to your plants without wasting a drop of water. A sensor placed in the water fill tube regulates the amount of water in the reservoir so you don’t have to.
Simply put: the technology of the EarthBox® gardening system allows plants to take water and nutrients when they are needed—with minimal maintenance by the gardener. By providing the plants with everything they need up front, and protecting their growing environment; they can grow rapidly and healthy—resulting in larger plants and increased crop yield.
For the last few years I have been trying to purchase new mulch covers for my Earth Boxes and have been un-successful. Every time I try to order new mulch covers from the website, they are out of stock. I have been using black plastic bags and binder clips on my Earth Box instead. When will you have more mulch covers available.
Hello Cindy, We are sorry for the inconvenience you have experienced. We have had mulch covers in stock for quite some time now, available for purchase here: https://earthbox.com/earthbox-accessories/earthbox-mulch-cover
You can also call us 24/7 at 1-800-4GARDEN and someone will be available to take your order over the phone. Happy Gardening!
I have used Earthboxes for many years. The problem I am having is my soil mixture keeps falling through the holes into my water reservoir. Eventually the reservoir is filled with soil and water will not go through the fill tube. Help??
Hi Sandra, This is not a common problem we come across. In order to help you further, we need some more information. We are more than happy to troubleshoot with you, so you don't experience this problem in the future. Please call us at 800-442-7336 between 8:30 AM - 4:30 PM ET and we'll be able to help you out. Thanks!
How can I keep the dog from ripping up the plastic cover? She has done it twice.
I have always changed or mixed new potting soil into my earthboxes (3). This year I decided to remove all the soil. To my amazement the soil completely filled the bottom below the aerator panel. And one still had water with sludgy mix. I believe it was because I used a potting soil, not a potting mix. Also the sides of the box "puffed out" and made it easier for the soil to fill the tank. And there were roots growing on the bottom of the aerator panel. The soil was a Sunshine mix probably blended with Black Gold organic. I have had mediocre luck with my tomatoes. This time I am using Miracle Gro organic and if I can get the old mix out of the boxes I'll see how I do. I live in the southwest where I get about 10" of rain annually. I was shocked to still have water in the box after winter. The top was covered with a mulch cover.
what is the price of replacement covers for the earth box? Thanks
Hello John, 1 black & white reversible mulch cover is $2. We also still have some red mulch covers available on clearance for the EarthBox Junior for $1/piece.
Black & White Reversible - https://earthbox.com/earthbox-accessories/earthbox-mulch-cover
Red Cover for Junior - https://earthbox.com/clearance-sale/earthbox-junior-mulch-cover-red
Am I able to use the staking system with the earthbox stand? I prefer raising the earthbox because it is easier on my back and keeps it more protected from critters.
Unfortunately, we do not recommend using the staking system with the garden stand. If you grow a vining crop with the system in the garden stand, the entire unit may become top heavy and topple over. Thank you so much for the question as we are constantly looking for ways to make our systems easier to use!
Wow! I have an original earth box. (No wheel frame, etc.) I was so EXCITED to come here and learn I could order an new and IMPROVED box! But I also see the comment that replacement plastic mulch covers are not available. I was going to order a couple for spring, but now I don’t know. - Doug in VA
Replacement mulch covers are available for purchase here: https://earthbox.com/earthbox-accessories/earthbox-mulch-cover