Introduction
There is a unique kind of joy that comes from sharing a favorite plant with a friend or neighbor. Some of the most beloved plants in our homes are "pass-along" varieties, handed down through generations because they are beautiful, resilient, and easy to multiply. The Begonia ‘Immense’ is a perfect example of this tradition. With its massive, star-shaped leaves and charmingly hairy stems, it makes a bold statement in any indoor space.
At Longfield Gardens, we believe that the most rewarding part of gardening is watching something small grow into something spectacular. Propagating your ‘Immense’ begonia is one of the easiest ways to experience this firsthand. Whether you want to gift a piece of your plant to a loved one or simply want to fill another corner of your home with greenery, the process is straightforward and achievable for gardeners of all skill levels. Explore the begonia collection for more inspiration.
This guide will walk you through the most effective ways to multiply your ‘Immense’ begonia using rhizome and leaf cuttings. We will also cover the best conditions to ensure your new plantlets thrive from the very beginning. Learning how to propagate this classic variety ensures that its beauty continues to grow in your home and beyond.
Understanding the Begonia 'Immense'
Before you start taking cuttings, it helps to understand how this plant grows. The ‘Immense’ begonia (scientifically known as Begonia × ricinifolia ‘Immense’) is a rhizomatous type. This means it grows from a thick, fleshy stem called a rhizome that typically creeps along the surface of the soil. These rhizomes act as energy storage for the plant and are the secret to successful propagation.
The leaves are the true star of the show. They can grow up to 12 inches wide, featuring a bright, grassy green color on top and a surprising splash of burgundy or red underneath. You will also notice soft, reddish "hairs" or trichomes along the stems and leaf edges. These give the plant a textured, vintage look that has made it a favorite for decades.
Because this plant grows so vigorously, it often eventually outgrows its container. When the thick rhizomes start to spill over the edge of the pot, it is the perfect time to think about propagation. Instead of seeing an overgrown plant as a problem, we view it as a source of many new baby plants.
The Best Time to Propagate
While you can propagate ‘Immense’ begonias at any time of the year indoors, you will see the fastest results in the spring and early summer. This is when the plant is naturally in its most active growth phase. The warmer temperatures and longer days give your cuttings the boost they need to establish roots quickly.
If you take cuttings in the winter, the process will simply take a bit longer. Keep the pots in a warm spot, away from cold drafts or chilly windowsills, to help them along. Consistency is the goal. Most begonias are tropical in nature and love temperatures between 70°F and 80°F. If your home stays warm, your cuttings will feel right at home.
Always check your parent plant’s health before you begin. A leaf or rhizome taken from a plant that is vibrant and well-hydrated will have a much higher success rate. We recommend watering your parent plant 24 hours before you plan to take your cuttings so the tissues are firm and full of moisture.
Essential Tools and Materials
Having the right supplies ready will make the propagation process much smoother. You do not need expensive equipment, but using clean, sharp tools is vital for preventing rot and ensuring quick healing.
Clean Cutting Tools
Use a sharp pair of garden snips, a craft knife, or a clean razor blade. It is a good idea to wipe your tools with rubbing alcohol before each cut. This prevents the spread of bacteria or fungi from one plant to another. A clean cut also heals much faster than a ragged, crushed edge.
The Right Growing Medium
Never use heavy garden soil for begonia propagation. It is too dense and stays wet for too long, which will cause the rhizome or leaf to rot before it can root. Instead, use a "soilless" seed-starting mix. We find that a blend of equal parts peat moss (or coconut coir) and perlite works best.
"Drainage" refers to how fast water leaves the soil, and a good propagation mix should drain very quickly while still holding onto a light amount of moisture. Perlite is the white, popcorn-like material in soil mixes that creates essential air pockets for new roots. For additional guidance, see Longfield Gardens’ begonia soil and drainage guide.
Containers and Covers
Small plastic pots or even recycled food containers with drainage holes are perfect. To keep humidity high, you will also want a clear plastic bag or a humidity dome. This traps moisture in the air so the cutting does not dry out before it has roots to drink with.
Key Takeaway: Success starts with clean tools and a light, airy soil mix. Avoiding heavy soil is the simplest way to prevent rot in your new cuttings.
Method 1: Rhizome Cuttings (The Fastest Way)
Propagating from the rhizome is the most reliable method for an 'Immense' begonia. Because the rhizome already contains the energy and structure needed for growth, these cuttings tend to establish themselves very quickly.
Step 1: Choosing Your Section
Look for a healthy, firm section of the rhizome that is about the thickness of a thumb. The best cuttings are usually found near the growing tips where the plant is most active. You want a piece that has at least one or two "nodes"—these are the small bumps or spots where leaves and roots emerge.
Step 2: Taking the Cut
Using your sterilized tool, cut a section of the rhizome about 2 to 4 inches long. If the section has leaves attached, that is fine. However, you don't need many. One or two small leaves are plenty. If the leaves on the cutting are massive, you can trim the leaf itself back by half with scissors. This reduces the amount of energy the cutting spends on maintaining the foliage and lets it focus on roots.
Step 3: Planting the Rhizome
Lay the rhizome cutting horizontally on top of your moist potting mix. Do not bury it deep. In fact, burying a rhizome completely is a common reason for rot. Gently press it into the soil so that about half of the rhizome is submerged and the other half is exposed to the air.
Step 4: Securing the Cutting
You can use a small U-shaped wire or even a bent paperclip to pin the rhizome down. This ensures it stays in constant contact with the moist soil, which encourages roots to sprout from the underside.
What to do next:
- Identify a firm, healthy rhizome tip.
- Cut a 3-inch section with clean snips.
- Press it halfway into a moist peat-perlite mix.
- Keep the soil "wrung-out sponge" damp.
- Place it in bright, indirect light.
Method 2: Leaf Cuttings (The Fun Way)
If you do not want to cut the main "trunk" of your plant, or if a leaf accidentally snaps off, you can use leaf propagation. This method is fascinating to watch, though it does take a few weeks longer than rhizome cuttings. Longfield Gardens’ leaf propagation guide covers similar techniques in more detail.
The Petiole Method
The petiole is the small stem that connects the leaf to the main rhizome.
- Take a healthy, mature leaf and leave about 1 to 2 inches of the stem attached.
- Insert the stem into your light potting mix at a slight angle.
- The base of the leaf should just touch the soil surface.
- Within a few weeks, roots will form at the base of the stem. Eventually, a tiny new rhizome and "micro-leaves" will emerge from the point where the stem meets the soil.
The Leaf Vein Method (Leaf Layering)
This method allows you to get several new plants from a single leaf.
- Lay a large, healthy leaf flat on a clean surface.
- Use a sharp blade to make small, shallow nicks across the main veins on the underside of the leaf. You do not need to cut all the way through.
- Lay the leaf flat on top of moist soil, underside down.
- Pin the leaf down with wire or small pebbles to ensure the cuts are touching the soil.
- Cover with a plastic bag to keep the humidity high.
New plantlets will eventually sprout from each of the spots where you nicked the veins. It looks like a small miracle, but it is simply the plant's natural drive to grow.
Key Takeaway: Leaf cuttings require more patience than rhizome cuttings, but they are a fantastic way to produce multiple baby plants from just one leaf.
Creating the Ideal Environment for Success
No matter which method you choose, the environment plays a huge role in how fast your new begonias grow. We find that focusing on three main factors—light, moisture, and warmth—yields the best results.
Bright, Indirect Light
Young cuttings are sensitive to the sun. While a mature ‘Immense’ begonia can handle some soft morning sunlight, a new cutting can easily scorch. Place your propagation pots in a spot with bright, filtered light. A North or East-facing window is usually ideal. If the light is too low, the new stems will grow long, thin, and weak as they "stretch" to find the sun. See Longfield Gardens’ guide to begonia light requirements.
High Humidity
Humidity is the secret weapon for begonia propagation. Because the cuttings do not have roots yet, they cannot take up much water from the soil. Instead, they rely on the moisture in the air to stay hydrated. Using a humidity dome or a simple clear plastic bag over the pot creates a mini-greenhouse that prevents wilting. Just be sure to open the cover for a few minutes every few days to let fresh air circulate.
Water Correctly, Not Constantly
Watering is where many gardeners feel the most pressure, but it is simpler than you think. The goal for a new cutting is to keep the soil damp, not soaked. If you squeeze a handful of the soil, it should feel moist, but no water should drip out.
Once your cutting has established roots and starts growing new leaves, you can transition to a more standard watering routine. Many begonia enthusiasts prefer "bottom-watering." This involves sitting the pot in a tray of water for about 10 minutes and letting the soil soak up moisture through the drainage holes. This keeps the crown and the hairy stems dry, which reduces the risk of rot.
Potting Up Your New Plantlets
Once your cuttings have developed a strong root system and have produced three or four new leaves, they are ready for their own permanent homes. This transition usually happens about 8 to 12 weeks after you first start the propagation.
Choose a pot that is only slightly larger than the root mass. Begonias actually prefer to be a little bit "snug" in their containers. A pot that is too large holds too much extra soil, which stays wet for too long and can lead to root issues. For more container guidance, see this begonia container planting guide.
We suggest using a high-quality indoor potting mix. From here, you can treat your new ‘Immense’ begonia like a mature plant. Give it plenty of room to spread its leaves, as this variety truly lives up to its name!
Signs your cutting is ready for a pot:
- You see active new leaf growth.
- The cutting feels "anchored" in the soil when gently nudged.
- Roots are visible near the drainage holes.
- The original "mother" leaf is beginning to wither (this is natural).
Troubleshooting Common Issues
Gardening involves a bit of observation and adjustment. If your propagation project isn't moving as fast as you expected, lead with these simple solutions.
The Cutting is Rotting
If a rhizome or leaf stem turns soft, black, or mushy, it is likely too wet. This can happen if the soil is too heavy or if the humidity dome is never opened for fresh air. If you see rot starting, use a clean knife to cut away the mushy part until you reach firm, green tissue. Let the cutting dry out on the counter for a few hours to "callous" before placing it in fresh, drier soil.
No New Growth After Several Weeks
Patience is part of the process. Depending on the temperature, it can take four to eight weeks just to see the first roots. If the cutting still looks green and firm, it is likely busy growing roots under the soil where you can't see them. If the room is cool, try moving the pot to a warmer spot, such as the top of a refrigerator.
Leaves are Turning Brown at the Edges
This usually means the air is too dry or the plant is getting too much direct sun. If the cutting isn't under a dome, try moving it a few feet away from the window. Avoid misting the leaves directly, as the "hairs" on the stems can trap water and cause fungal spots. Instead, mist the air around the plant or use a pebble tray. Longfield Gardens’ begonia humidity and airflow advice offers additional help.
Maintaining a Healthy Parent Plant
After you have taken your cuttings, your original Begonia 'Immense' will need a little bit of care to bounce back. Cutting off a piece of the rhizome is actually a form of pruning that can help rejuvenate an older, leggy plant.
Keep the parent plant in its usual spot and maintain its regular watering schedule. You may see new growth sprouting from the rhizome exactly where you made the cut. Within a month or two, the plant will likely look fuller and more vibrant than it did before.
Taking regular cuttings ensures you always have a "backup" plant and plenty of "babies" to share. This cycle of growth and sharing is what makes the ‘Immense’ variety a staple in so many homes. Our team at Longfield Gardens finds that these vigorous growers are the most rewarding plants to have in a collection because they give back so much.
Conclusion
Propagating the 'Immense' begonia is a rewarding way to connect with the traditions of indoor gardening. By taking a simple rhizome or leaf cutting, you are continuing the legacy of a plant that has been a favorite for generations. It is a process that rewards a little bit of patience with a lifetime of beautiful, bold foliage.
At Longfield Gardens, we want to help you feel confident in every step of your gardening journey. Growing new plants from the ones you already love is a great way to expand your collection and share the beauty of nature with those around you. With just a few basic tools and a warm, bright corner, you can turn one plant into a whole family of begonias. For additional indoor-care guidance, see how to care for begonias indoors.
Key Takeaway: Start with a healthy rhizome, provide plenty of bright indirect light, and keep the air humid. Before long, you will have a collection of "immense" begonias to enjoy and share.
Your next step is simple: take a look at your begonia and see if there is a rhizome creeping toward the edge of the pot. Grab your snips, follow the steps above, and start your next growing project today.
FAQ
Can I propagate Begonia 'Immense' in a glass of water?
While some begonias root well in water, the 'Immense' variety is a rhizomatous type and is prone to rotting if the thick stems are submerged. It is much more successful to root your cuttings directly in a moist, soilless potting mix. If you do try water, only use a leaf petiole (stem) and keep the leaf itself dry.
How long does it take for a leaf cutting to grow a new plant?
Leaf propagation is a slower process than rhizome propagation. You can usually expect to see roots within 3 to 4 weeks, but the actual "baby" plantlets may not appear for 8 to 12 weeks. Keeping the cutting in a warm, humid spot is the best way to speed this up. For another step-by-step reference, see how to propagate a begonia leaf.
Does my new cutting need fertilizer?
No, you should avoid fertilizing your cuttings until they have established a strong root system and are growing several new leaves. The cuttings rely on the energy stored in the rhizome or leaf. Once the plant is established in its permanent pot, you can use a balanced liquid fertilizer at half-strength during the spring and summer.
Is Begonia 'Immense' safe for homes with pets?
Begonias contain calcium oxalates, which can be irritating or toxic to cats and dogs if chewed or swallowed. The rhizomes contain the highest concentration of these compounds. It is best to keep your propagation trays and mature plants on high shelves or in areas where your pets cannot reach them.
