Enjoying Outside, Inside - Hydroponic Gardens

Kristie Ehrhardt • March 7, 2024

Photo by HGTV.com

If you would like to grow your own salad bowl but don’t have space or want to deal with soil, an indoor hydroponic garden system might be exactly what you’re looking for. Hydroponic gardens are grown in water without soil. Plants are suspended over a tank of water while their roots hang down into the water and absorb nutrients. Plants grown hydroponically grow faster and often yield a larger bounty of in and off season produce than those grown in a typical outdoor garden. They use much less water and space and it doesn’t matter what the weather or outdoor temperature is. Another benefit is that you can have weed and pest-free produce without using insecticides or pesticides. To grow hydroponically you’ll need a largish container with a lid, suitable plants, water, nutrients and a light source.

Although you can purchase a premade hydroponic gardening system, making your own isn’t complicated or expensive. The easiest style to make is call a “deep water culture” and uses either a five-gallon bucket or a plastic storage tub to hold the water and nutrients, just do ensure that the container is food safe. You should choose a container that is roughly the size that the mature plant’s canopy will be. If you’re growing several leafy plants, a larger container will be needed. You’ll need a support or shelf to hold the plants in their pots above the water. If you’re using a bucket or storage container, just drill holes in the lid so the pots can dangle through the lid. The hole should be large enough for most of the pot to fit through but not fall completely through the hole.

As far as pots go, net pot, pots with slits along the sides of them work well and allow space for the roots to expand and reach the water below. There are several substrate options for inside the pots including rockwool, coconut coir, perlite, pumace and gravel. Some of them can be reused while some of them are more or less expensive.

If you’re growing inside the house, you’ll likely need an artificial light source and this might be the most complicated part of hydroponic gardening. LED and fluorescent lights are the easiest to set up. LED lights are very long lasting and energy efficient but they are more expensive. Fluorescent lights are cheaper but they have a shorter life and some of them do not emit the full spectrum. Some fluorescent bulbs emit mainly blue light which works if you’re only growing leafy greens. The red end of the spectrum helps plants to develop sturdier stems to support flowers and fruit. If your garden is easily to relocate, you can put it outside in the summer but that doesn’t really count as enjoying outside, inside!

The roots will need to have access to the air. If you’re using a smaller set up like the bucket or storage tub, make sure that a portion of the pot is above the water level to allow the roots to access to air. Once the roots have developed, only allow about 1/3 to 1/2 half of the root length to be submerged by lowering the water level of the container. If you’re growing several types of plants with different root lengths, an aquarium air stone connected to a pump will push oxygen into the water. If you have a very large set up with multiple containers, you may need to consider a system using tubing which circulates and aerates the water as it passes from the containers to a reservoir.

You’ll also need to check the condition of your water, specifically looking at the acidity (PH) and the alkalinity. The ideal PH range is 5.4 to 7 and anything higher or lower than this range will affect how the plants utilize the nutrients from the water. You can test the PH of the water with testing paper and then add the appropriate fertilizer to balance it out. Keep in mind that ammonium or urea-based fertilizer will make the water more acid (lower PH) and nitrate-based fertilizers make it more basic (higher PH). The water should be tested every few weeks. Alkalinity is the presence of bicarbonate in the water; hard water is usually more alkaline. Nitrate-based fertilizers will increase this. Using acid-based fertilizers that will lower the PH will help reduce the alkalinity of the water. You can also add citric, phosphoric, or sulfuric acid or vinegar to the water to help lower the PH. You can also use bottled reverse osmosis filtered water if your tap water is alkaline.

Plants require nutrients to develop and only carbon, hydrogen and oxygen are present in a hydroponic system. Large amounts of nitrogen, phosphorus and potassium are needed as well as smaller amounts of calcium, magnesium, sulfur, manganese, iron, molybdenum, copper, zinc, boron, chlorine and nickel must also be added. There are lots of premixed liquid and dry fertilizers tailored to different vegetables to choose from with label directions for precise measuring. If you add or completely change the water, be sure to test it for PH and alkalinity and then add the appropriate amount of fertilizer for the amount of fresh water added or replaced.

Some plants that are great for novice hydroponic gardeners include leafy greens like lettuce, spinach, swiss chard, kale, chives, basil and mustards and if you have space, you can grow lots of different fruits such as strawberries, cucumbers, peppers, tomatoes and many more. Because these plants (and many others) are self-pollinating, they can produce fruit while being grown indoors without the presence of pollinators. In fact, some commercial growers are producing these fruits hydroponically for market.  And, if you’re really invested and want to branch out into a bigger and more complex system, you can grow root vegetables like carrots and beets as well as broccoli and cauliflower.

-Kristie Ehrhardt ( kehrhardt@tuleyome.org )

Tuleyome Land Conservation Program Manager

Looking for more articles like this? Click the hashtag below!

RECENT ARTICLES

By Ellen Jenkins July 2, 2026
From left to right, Horticulture Interns Ellen Jenkins, Rithika Warrier, and Diego Barraza Hernandez, with Education Associate Geoff Benn, who coordinates the internship program. From September to June, I worked as a Horticultural Intern at Tuleyome. Each week at the Woodland Regional Park Preserve, I would meet with my mentor Teri Barry. Over the course of the year, we worked together identifying, documenting, and analyzing the preserve's growth. Through this opportunity, I gained experience in hands-on restoration efforts, familiarity with plant taxonomy and classification, and community outreach.
By Kristie Ehrhardt July 2, 2026
I’m sure you already know that the Bald Eagle is used as a symbol of our Nation’s freedom, strength, perseverance and independence. It is said that our founding fathers chose the Bald Eagle to adorn our Great Seal because it is indigenous to North America and if you look closely at it, you’ll see that it is holding 13 arrows and an olive branch simultaneously symbolizing the power of war and the power of peace. But, what about our national mammal? Er, maybe you didn’t even realize that we had a national mammal… President Barack Obama designated the American Bison as our national mammal in May of 2016. It too is endemic to North America and in prehistoric times, millions of them roamed through roughly two-thirds of the United States. Their range was known as the “great bison belt” - a stretch of habitat that encompassed the forests of Alaska, the grasslands of the North American plains and stretched from the Great Basin east to the eastern Appalachian Mountains. Side note - I’m just gonna come clean right now and tell you that the historic range of the American bison, American Buffalo or just plain bison or buffalo does NOT include the Berryessa Snow Mountain National Monument (Monument). I’m supposed to be writing about the Monument region and I picked a topic that is clearly not there but it’s important and they are impressive so please don’t tattle. Another side note - the American Bison and the American Buffalo are one in the same and both names can be used interchangeably. Its scientific name (genus and species) is actually Bison bison so I guess calling them bison is probably more scientifically accurate but either works. Bison are North America’s largest land animal; an adult male averages about 2,000 pounds - that’s a ton (thanks Schoolhouse Rock, I will never forget this one!), are about 12 feet long from nose to rump and about six feet tall. Females max out at around 1,000 pounds and are a little over nine feet long. In the wild bison can live ten to twenty years. Both females and males have massive forequarters and sport what looks like a shaggy, long-sleeved sweater. Both sexes have short, curved horns that are an integral part of their status in the herd and defensive strategy. During the snowy winters, bison display a dark brown winter coat and in the summer they show off their lighter brown summer-bods. Calves typically arrive from March through May depending on weather conditions. When they’re first born calves are an orangey-red color which earned them the nickname “red dogs”. Within a few months they become darker brown like their parents and their little horns start to poke through. Around this time they also begin to develop their iconic shoulder hump. The hump is made of solid muscle buttressed by elongated vertebrae. This dense network of muscles act as a powerhouse that allows the animal to swing its massive head from side to side and plow through icy snow to access buried forage enabling them to survive even the harshest winters. Although they are not known for keen eyesight, bison have superb senses of hearing and smell. As monumental (get it?) as these animals are, they are shockingly quick and agile. Bison have been clocked at running 35 miles per hour (!), they can spin and turn on a dime, leap over high fences and are incredibly adept swimmers. All these mad skills on a strictly vegetarian diet - that’s ruminant efficiency. For thousands of years, before the European settlers arrived, Native Americans of all tribes and regions revered the bison. They were the cultural, spiritual and resource backbone of indigenous societies across the United States. Every part of the animal was used; the meat was consumed, the hide was used for clothing, shoes and shelters, and the bones and hooves were used for tools and weapons. Even the sinew was used for sewing and bow strings. Everything was copacetic then came the Europeans with their domestic cattle diseases and thoughtless greed. Bison were hunted to near extinction within roughly just 100 years. Their numbers went from an estimated 60 million (!) to less than 550 individual animals by 1889. They were hunted mercilessly and their habitat destroyed, some say as a way to control the Native Americans by removing their primary resource. One of the buffalo’s biggest fans was President Teddy Roosevelt. In the early 1880’s he traveled to what is now North Dakota (shout out to my people!) to hunt. After recognizing the bison’s diminishing population numbers he co-founded the American Bison Society in 1905 to help conserve and protect this American emblem. For many years the few buffalo that remained were only found in national parks and preserves but primarily on Native American reservations. Had it not been for the willingness of tribes across the country to work with interested individuals and state and federal governments, the American Bison would be gone today. Much like the Bald Eagle, the bison is an authentic symbol of American character and as it turns out, another one of the greatest conservation success stories in U.S. history. The bison within the Yellowstone National Park boundaries are direct descendants of the original animals that roamed our country’s grasslands and are the only herd that still occupy their original prehistoric location. This free-ranging herd numbers approximately 5,500 animals and is the largest herd on public land. Recovery efforts paid off and today bison can be found in all 50 states including private and tribal lands, national parks and wildlife refuges.