Table of Contents
- Introduction
- Can Begonias Grow in Water?
- Choosing the Best Begonias for Water Growth
- How to Start Begonia Cuttings in Water
- Creating the Ideal Environment for Water Rooting
- Long-Term Care for Begonias in Water
- Transitioning Your Begonias from Water to Soil
- Troubleshooting Water-Grown Begonias
- Conclusion
- FAQ
Introduction
There is a special kind of magic in watching a new plant come to life right before your eyes. One of the most satisfying ways to experience this is by growing plants in water, where you can observe every tiny root as it emerges and grows. Begonias are particularly wonderful candidates for this simple method of gardening. At Longfield Gardens, we love how these versatile plants offer endless variety, from the shimmering patterns of Rex begonias to the prolific blooms of wax varieties, and you can browse our begonia collection to see what is available.
This guide is designed for any gardener who wants to expand their collection or simply enjoy the beauty of begonias in a clean, soil-free environment. We will cover which varieties work best, how to take the perfect cutting, and how to keep your water-grown begonias healthy for weeks or even months. Whether you are a beginner looking for an easy win or a seasoned gardener wanting to save a favorite plant from the frost, you will find that growing begonias in water is an achievable and rewarding project.
Begonias are naturally resilient and adapt surprisingly well to a life in water, making them a perfect choice for home propagation and decorative displays. For a broader overview of the family, see our All About Begonias guide.
Can Begonias Grow in Water?
The short answer is a resounding yes. Begonias are among the easiest plants to grow in water. This process is often referred to as water propagation, but for many begonias, it can also be a long-term way to display the plant. Because begonias have fleshy, succulent-like stems, they hold onto moisture well and are quick to develop "adventitious roots." These are roots that grow from non-root tissue, such as a stem or a leaf, when placed in the right environment.
Growing begonias in water is an excellent way to "clone" your favorite plants. Since begonias are often hybrids, growing them from seeds can be unpredictable. However, a cutting grown in water will be an exact genetic match to the parent plant. This allows you to keep the same leaf patterns and flower colors you fell in love with originally. It is also a very clean method of gardening, as it removes the need for heavy bags of potting soil and reduces the risk of soil-borne pests like fungus gnats.
While many people use water growing as a temporary step before moving a plant into a pot, some begonias can live in water for quite a long time. As long as the plant receives the right light and a few essential nutrients, it can serve as a beautiful, low-maintenance centerpiece on a windowsill or desk.
Key Takeaway: Begonias are biologically wired to root easily from cuttings, making water an ideal medium for starting new plants or creating soil-free displays.
Choosing the Best Begonias for Water Growth
While most begonias can grow in water, some varieties are more enthusiastic about it than others. Choosing the right type of begonia is the first step toward a successful water-growing experience. If you want to compare forms and foliage types, the Types of Begonias guide is a helpful place to start.
Cane-Like Begonias (Angel Wing)
Cane begonias, often called Angel Wing begonias because of their leaf shape, are perhaps the easiest to grow in water. They have sturdy, bamboo-like stems with distinct "nodes" (the bumps where leaves grow). These nodes are where the roots will form. These plants are tough and can stay in water for months, often producing new leaves and even flowers while submerged. For more detail on this group, see our begonia propagation guide.
Rex Begonias
Known for their spectacular, colorful foliage, Rex begonias are a favorite for indoor displays. They grow from a thick rhizome (a horizontal stem). You can grow Rex begonias in water using either a stem cutting or even a single leaf. Seeing the intricate silver, purple, and green patterns of the leaves reflected in a glass vase is particularly striking. If you want to try the leaf method, our begonia leaf propagation guide explains the process.
Wax Begonias (Fibrous Begonias)
Wax begonias are the classic bedding plants found in many summer gardens. If you have a favorite wax begonia in a garden bed, you can take a cutting before the first frost and bring it inside to grow in water. They are very reliable rooters and will often continue to produce their small, cheery flowers even while they are living in a simple jar of water. For another step-by-step option, see our begonia cutting guide.
Rhizomatous Begonias
Similar to Rex begonias, these types grow from a creeping stem. They are generally very hardy and respond well to water rooting. They tend to be a bit slower to produce roots than the cane types, but the result is a very stable and long-lasting plant.
How to Start Begonia Cuttings in Water
Starting your begonia in water is a straightforward process that requires only a few tools. Following these steps ensures your cutting has the best chance of developing a healthy root system. If you are shopping for plants first, you can always browse the begonia flower bulbs for sale before you begin.
Step 1: Select a Healthy Stem
Choose a stem that looks vibrant and strong. Avoid any stems that are currently blooming heavily, as the plant is putting its energy into the flowers rather than root production. Look for a stem that has at least two or three leaves and is about 4 to 6 inches long.
Step 2: Make the Cut
Using a clean, sharp pair of scissors or a garden knife, cut the stem at a 45-degree angle. The most important detail is to make the cut just below a node. The node is the area where the leaf meets the stem; this is where the highest concentration of natural rooting hormones is located. A clean cut prevents crushing the delicate tissues, which helps the plant "drink" water more effectively.
Step 3: Prepare the Cutting
Remove any leaves from the bottom half of the cutting. You do not want any leaves to be submerged in the water, as they will eventually rot and foul the water. You should be left with a bare stem at the bottom and a few healthy leaves at the top to provide energy through photosynthesis.
Step 4: Place in Water
Fill a clean glass or vase with room-temperature water. Place the cutting inside, ensuring that at least one or two nodes are underwater while the leaves remain above the rim.
What to Do Next for Rooting Success
- Use a clear glass container so you can monitor root growth.
- Place the container in a spot with bright, indirect light.
- Change the water every 5 to 7 days to keep it fresh and oxygenated.
- Be patient; roots typically appear within 2 to 4 weeks depending on the variety.
Creating the Ideal Environment for Water Rooting
For begonias to thrive in water, they need more than just a jar and a cutting. The environment around the plant plays a huge role in how fast those roots develop and how healthy the plant remains.
The Importance of Light
Begonias in water need bright, indirect light. A windowsill that faces east or north is often perfect. You want enough light for the leaves to produce energy, but you must avoid direct, harsh afternoon sun. Direct sunlight can heat the water in the glass to high temperatures, which can stress the plant and encourage the growth of algae. If you notice the water turning green, your plant is likely getting too much direct sun. For a broader look at light needs, see Are Begonias a Sun or Shade Plant?
Temperature Consistency
Begonias are tropical plants at heart. They prefer temperatures between 65°F and 75°F. Avoid placing your water-grown begonias near drafty windows in the winter or directly in front of air conditioning vents in the summer. Sudden changes in temperature can cause the plant to drop its leaves.
Water Quality
While most begonias are fine with standard tap water, they can sometimes be sensitive to high levels of chlorine or fluoride found in some city water supplies. If you find that the edges of your leaves are turning brown, try using filtered water or rainwater. Alternatively, you can fill a pitcher with tap water and let it sit out overnight before using it; this allows some of the chlorine to evaporate.
Oxygen and Airflow
Roots need oxygen to grow. When water sits for too long, the oxygen levels drop. This is why we recommend changing the water weekly. When you pour in fresh water, do it with a bit of a splash; this helps incorporate more oxygen into the water, giving the roots a "breath" of fresh air.
Key Takeaway: Bright indirect light and fresh, room-temperature water are the two most important factors for keeping your water-grown begonias happy.
Long-Term Care for Begonias in Water
If you decide to keep your begonias in water indefinitely rather than moving them to soil, you will need to provide a little extra care. Water alone does not contain the minerals and nutrients that plants naturally find in the earth. If you want to keep exploring begonias for indoor growing, see How to Grow a Begonia Indoors.
Feeding Your Water-Grown Begonia
Plants grown in soil get nutrients from decomposing organic matter. In a vase, you must provide those nutrients yourself. Every few weeks, you can add a tiny amount of liquid fertilizer to the water. Use a balanced, water-soluble fertilizer and dilute it to about one-quarter of the strength recommended on the label. Too much fertilizer in a water environment can "burn" the delicate roots, so it is always better to use less rather than more.
Preventing Algae Growth
Algae is a common challenge when growing plants in clear water. While a little bit of green film isn't usually harmful to the plant, it can look untidy. To minimize algae, keep the water clean and the glass scrubbed. You can also use an opaque vase (like ceramic or colored glass) to block light from reaching the water, which stops algae from growing.
Pruning and Shaping
Even in water, begonias will continue to grow. Cane begonias can become quite tall and top-heavy. Don't be afraid to trim the top of your plant to encourage it to grow bushier. You can even take the piece you trimmed off and start a second water cutting!
What to Do Next for Long-Term Care
- Wipe the leaves with a damp cloth every few weeks to remove dust.
- Trim any roots that look brown or mushy to keep the system healthy.
- If the plant outgrows its container, move it to a larger vase to prevent the roots from becoming cramped.
- Add a drop of liquid fertilizer only after the plant has established a strong root system.
Transitioning Your Begonias from Water to Soil
Many gardeners use water as a "nursery" to get roots started before moving the plant into a permanent pot. This is a great way to ensure a cutting is viable before committing it to soil. However, the transition from water to soil can be a bit of a shock to the plant's system. If you want a quick reference before planting outdoors, check the hardiness zone map.
When is it Time to Pot?
The best time to move a begonia cutting into soil is when the roots are about 1 to 2 inches long. You don't want to wait until the roots are extremely long and tangled, as "water roots" are structurally different from "soil roots." The longer a plant stays in water, the harder it has to work to adapt to the denser environment of soil.
The Potting Process
When you are ready to move your plant, choose a small pot with excellent drainage. We recommend using a high-quality, lightweight potting mix. Make a hole in the center of the soil, gently place the roots inside, and fill in around them. Do not pack the soil down too hard; begonia roots need air to breathe.
Post-Potting Care
For the first week or two after moving your begonia to soil, keep the soil slightly moister than usual. Since the plant is used to being submerged, it needs a transition period to adjust to the drier medium. Place it in the same light conditions it enjoyed while in the water to minimize stress. Once you see new leaf growth, you can begin a regular watering schedule, allowing the top inch of soil to dry out between waterings.
Key Takeaway: To successfully move a begonia from water to soil, do it when roots are about two inches long and keep the soil damp for the first fortnight.
Troubleshooting Water-Grown Begonias
While growing begonias in water is generally very successful, you might run into a few common hurdles. Most of these are easy to fix by making one small change at a time.
Why Are the Stems Rotting?
If the bottom of your stem becomes mushy or turns black, it is likely rotting. This usually happens if the water hasn't been changed frequently enough or if the cutting was taken from an unhealthy part of the parent plant. The Fix: Take the cutting out, trim off the mushy part back to healthy, firm tissue, and thoroughly clean the vase. Refill with fresh water and try again. Ensure no leaves are touching the water.
Why Aren't Any Roots Forming?
If it has been a month and you see no roots, the plant might not be getting enough light or warmth. The Fix: Move the jar to a slightly warmer spot or a brighter window. Make sure you included a node in the water, as roots will rarely grow from the middle of a smooth stem section. For more on starting plants indoors, see How to Start Tuberous Begonias Indoors.
Why Are the Leaves Dropping?
Begonias may drop leaves if they are stressed. This could be due to a sudden temperature change, a draft, or moving the plant too frequently. The Fix: Find a permanent, stable spot for your plant and leave it there. Avoid placing it near heaters or air conditioners.
Why Is the Water Cloudy?
Cloudy water is a sign of bacterial growth. The Fix: Change the water immediately and rinse the stems and the roots under a gentle stream of room-temperature water. Scrub the container with soap and water before replacing the plant.
Conclusion
Growing begonias in water is a delightful way to bring the beauty of the garden indoors. It simplifies the process of making new plants and allows you to enjoy the unique textures and colors of begonias in a modern, clean way. At Longfield Gardens, we believe that gardening should be a source of joy, and there is nothing quite as rewarding as the simple success of a rooting cutting. Whether you keep your begonias in a decorative glass on your kitchen table or eventually move them into beautiful pots, you are participating in one of the most fundamental and enjoyable parts of plant care.
- Select healthy, non-blooming stems with at least two nodes.
- Use clear glass and change the water weekly to maintain oxygen.
- Provide bright, indirect light and keep the environment warm.
- Be patient and enjoy the fascinating process of root development.
Growing a begonia in water reminds us that with just a little light and fresh water, nature is always ready to grow and thrive.
FAQ
Can I grow begonias in water forever?
While begonias can survive in water for many months, they eventually need nutrients that water alone cannot provide. If you wish to keep them in water long-term, you must use a diluted liquid fertilizer every few weeks. Over time, the plant may lose some of its vigor compared to a soil-grown plant, but it can still remain a beautiful decorative piece for a significant amount of time.
Which part of the begonia do I put in the water?
You should submerge the lower part of a stem cutting, specifically ensuring that at least one or two "nodes" are underwater. The node is the bump on the stem where leaves emerge, and it is the only place where roots will reliably grow. Never submerge the leaves themselves, as they will rot and cause the water to become unhealthy for the plant.
How long does it take for begonias to root in water?
Most begonias will begin to show tiny white root nubs within two weeks. A substantial root system that is ready for soil typically takes four to six weeks. The exact timing depends on the variety of the begonia, the amount of light it receives, and the temperature of the room.
Do I need to use rooting hormone for water propagation?
No, you do not need rooting hormone to grow begonias in water. Begonias are naturally high in auxins, which are the plant hormones responsible for root growth. While you can use a rooting hormone if you wish, most gardeners find that begonias root just as successfully and quickly in plain, clean water.