Some plants will thrive in water instead of soil and you have the added enjoyment of seeing the roots develop as your plant grows. This is a guide about growing plants in water.
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You don't need to have a green thumb to grow houseplants in water. Even if you've killed every houseplant growing in soil that you have ever had, your success is almost guaranteed when growing them in water. Other than sticking the cut end of a stem into a jar of water and setting the jar on your window sill, there's very little else to do except to sit back and watch it grow!
When choosing houseplants to grow in water, it's important to select species that are known to perform reliably without soil. Surprisingly, this includes many herbs and even some flowering plants. In general, plants with strong, woody stems make the best candidates. Some will last for many years, while others last only a few (or even one). The following list of plants that grow well in water is by no means complete, so have some fun experimenting:
Whether clear or colored, as long as it's translucent (see-through), anything you have laying around that is glass or plastic and holds water is a potential vessel for your houseplants. Dollar stores and craft stores are great places to find inexpensive bottles and vases, but old-fashioned canning jars or even drinking glasses work great, too. Providing your houseplants are healthy (and not dying or rotting in water), algae growth will seldom become a problem - even if plants are placed in direct sunlight.
Rooting your plants in water is just like rooting them in soil. All you need to do is clip off a small, actively growing segment from the existing plant (right below the leaf), and insert it into a jar or vase filled with water. Once you have the cutting in the water, Mother Nature takes care of the rest. Roots will soon appear along the submerged stems, followed shortly by sets of new leaves.
Another beauty of growing houseplants in water is that the after-care is nearly as simple as the initial steps.
Sunshine: Some plants flourish best in a clear jar on a sunny window shelf; others seem happier in a ceramic vase on the living room table. Don't be afraid to move your cuttings around until you find the combination that's compatible. In general, a plant growing in water will have the same light requirements as it would if it were growing in the soil.
Water: Most tap water is either chlorinated or the nutrients have been filtered out, and soft water is too salty. Bottled spring water or well water will yield the best results. Plan to change the water about once a month. In the meantime, you can keep adding a small amount of water as it evaporates from the vase.
Feeding: Add just a few tiny grains of soluble plant food or a couple of drops of a liquid fertilizer to the water after each change. Be very careful here - a little goes a very long way. Unlike adding fertilizer to soil, fertilizer added to water is immediately available to the plant's roots so it's very easy to overdo it and injure your plants.
Controlling growth: If excessive root growth becomes a problem, simply cut back some of the roots or pot the plants in soil. Take care when transitioning plants to soil. Water-grown roots are different than soil-grown roots and tend to be brittle. They may snap off if handled roughly. Start by moving your water plants to a pot filled with porous potting soil. Keep the potting medium evenly moist for several weeks until the plants have time to make the transition, then move them to a heavier soil.
By Ellen Brown
I began growing plants in water when I was trying to root a plant cutting that I had. I loved being able to see the roots as they grew so I decided to leave the cutting in water instead of planting it. I found an old Erlenmeyer flask at Goodwill and transferred it to the flask. I also found a neat vase that I put my bamboo into. There is a lot of neat glassware at second hand stores that would be great for growing plants in!
By Laurel from Port Orchard, WA
Who needs dirt? Not your houseplants, at least not all of them. Many can be cultivated using a technique called Hydroculture, where soil is replaced with water and a liquid fertilizer, and a clay aggregate is used to support the plant's roots. For people who travel a lot, or for those of us who tend to over or under water our houseplants, Hydroculture may be a good solution.
Plants are grown in containers filled with water and liquid fertilizer. The plants take in nutrients from a water solution through their "water" roots. After continuously being submerged in water, they have adapted by developing a greater capacity to store oxygen. Once the hydroculture system has been set up, a float in the reservoir indicates when it's time to add more solution.
Reduces pests and disease. No soil means no more soil born pests, including those creepy little potting soil gnats. You can also say goodbye to mold spores and mildew-a boon for those who suffer from allergies.
Lower maintenance. Hydroculture is cleaner and easier to maintain. By eliminating dirt, you eliminate must odors and messy spills. You'll need to water less often, transplant less often, and worry less about leaving your plants unattended while on vacation.
By Ellen Brown
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Here are questions related to Growing Plants in Water.
Can I grow indoor plants in water only? What do I do with indoor plants in water when the water begins to smell bad? Other than replacing all the water.
Hardiness Zone: 6a
By marianjn from Provo, UT
By Cyinda  09/02/2009
You can also add food coloring to the crystals:
Back in the mid 70s there was a company that offered their house plants through home parties. The plants were grown in some kind of lava looking pebbles and did not use soil at all. You watered with their plant food solution each time you watered. The plants grew beautifully! Does anyone know what happened to the company or know what type of pebbles and solutions were used?
Hardiness Zone: 7a
By Daisy from Franklinton, NC
By Lois Johnston 06/25/2010
I was a dealer in Iowa, I sold plants like crazy but the company I worked for went bankrupt. Hydroponics is what you are looking for, and yes it was lava rocks. However, weak miracle grow and a air pump from an old fish tank works great to grow soil-less plants.
I remember my mom growing sweet potato vines (as house plants) in a mason jar. How do you do it? I'd love to know. Can they remain in the water with some marbles in the bottom, or do they need to be planted? What type of light do they need? If I need to plant them, what do I keep the moisture level at for the soil?
I can't remember which end of the sweet potatoe to place in water to root it?
jenny from KY
By (Guest Post) 12/30/2008
I think success/failure depends a lot on how long the potato was in cold storage before you bought it. So try again, after you ask your friendly produce manager!
I would like to have a vase on my desk with a plant in water. Which plants will grow this way?
By RL from Basking Ridge, NJ
Spider Plants are attractive and will grow in water alone for up to a year plus, just add a little plant food once every few months and you are all set.
I'm doing a science fair project on how different liquids effect how plants grow. I'm growing radishes, pole bean and peas in orange juice, diet ginger ale, milk, water and diluted vinegar. I need some research on how each liquid can effect my plants. Can you help?
By Tally from Ontario, Canada
By Barbara Petty  02/14/2010
In our area, we have a County Extension Agent who is very knowledgeable about the soil, plants, and so on in our particular area.
The County Extension Office offers a multitude offers of help. They will mail leaflets and brochures to you. Our extension agent will test the soil for you. And advise what should be added to your soil for the particular plants you'd like to grow. They also have a "test" garden here, which shows the plants that grow well here. They offer workshops for pruning grapevines and fruit trees. There is just a multitude of things available thru this office. I imagine they would be very helpful to you and your Science projects.
I've had my indoor ivy plant, which I have grown in water, for a couple of years now without a problem. I trim the roots when they get too long and clean off any algae that may arise from the sunlight.
A couple of days ago I did the same and noticed this thick black "scab" all over the stems. Now my leaves are all turning yellow. Anyone, any ideas on how to solve this issue?
By Jess  11/04/2013
I think that is a philodendron or a pothos, not an ivy. Usually, they go yellow when they are not getting enough of something: water, light, nutrients. Since you have been growing them in water for so long, have you been adding any plant food to the water? I don't know anything about the black scab but maybe someone else will have some other ideas. Good luck.