Bonsai Tree Not Thriving? 7 Common Mistakes and How to Fix Them
Posted by Angel O. on Aug 20th 2025
Bonsai trees are not just plants, they're living art, and they require a little extra care and attention to keep them thriving. Whether you're a seasoned bonsai enthusiast or a beginner just starting your journey, it’s common to encounter some issues along the way. If your bonsai tree is looking less than its best, don't worry, many problems can be fixed with the right knowledge and a few adjustments.
In this comprehensive guide, we’ll dive into 7 common mistakes bonsai owners make and how you can avoid or fix them, helping your tree stay vibrant and healthy for years to come.
1. Overwatering: The Silent Killer
The Problem:
Overwatering is one of the most common mistakes bonsai owners make. Bonsai trees, though small, have specific water needs. Too much water can saturate the soil, depriving the roots of necessary oxygen and leading to root rot, mold, and other health issues.
How to Fix It:
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Check Soil Moisture: Before watering, always check the moisture level of the soil. Stick your finger about 1-2 inches deep. If it feels dry, it’s time to water. If it’s still moist, hold off.
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Water Properly: When you do water, ensure it is done thoroughly. Water the tree until the water starts to drain out of the pot. This helps prevent water from accumulating at the bottom of the pot, which can cause root rot.
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Proper Drainage: Ensure that your bonsai pot has adequate drainage holes to allow excess water to escape. At Hagabon.com, we offer a range of bonsai pots with proper drainage that support healthy root systems.
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2. Root Rot: A Deadly Disease
The Problem:
Root rot happens when your bonsai’s roots become overwhelmed with water and begin to decay. This is often caused by overwatering or poor drainage, but it can be a slow process, making it difficult to catch until the damage is done.
How to Fix It:
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Inspect the Roots: Gently remove the bonsai from its pot to check the root system. Healthy roots should be firm and white. If they appear brown, mushy, or emit a foul smell, root rot has set in.
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Trim Rotting Roots: Using clean, sharp scissors or concave cutters, trim away any damaged roots.
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Repot in Fresh Soil: Once you've removed any rot, repot the tree in fresh, well-draining soil to give the roots the space they need to heal. We recommend using a mixture of Akadama, Pumice, and Lava Rock to promote good drainage and prevent water retention.
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3. Wrong Pot Size: Too Small or Too Large?
The Problem:
A pot that’s either too small or too large can have a significant impact on your bonsai’s health. A pot that’s too small won’t give the roots enough room to grow, while one that’s too large can trap excess moisture and cause root rot.
How to Fix It:
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Choose the Right Size Pot: Bonsai pots should be just a little larger than the root ball. This allows enough room for the roots to grow without overwhelming the tree.
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Repot Periodically: Bonsai trees should be repotted every 1–2 years to refresh the soil and allow room for root expansion. Repotting also gives you the opportunity to inspect the health of the roots and make any necessary adjustments.
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4. Poor Soil Quality: The Foundation of a Healthy Tree
The Problem:
Bonsai trees require soil that drains well while still retaining enough moisture and nutrients for the roots. Regular garden soil is often too dense for bonsai and can lead to poor root development and a weak tree.
How to Fix It:
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Use the Right Soil Mix: It’s essential to use a high-quality bonsai soil mix designed for proper drainage. We recommend a combination of Akadama, Pumice, and Lava Rock for most bonsai species.
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Repot in Fresh Soil: If you notice your tree struggling, consider repotting with new, well-draining bonsai soil to give your roots the best environment to thrive.
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5. Lack of Light: The Essential Ingredient for Growth
The Problem:
Bonsai trees require the right amount of light to grow and thrive. Without sufficient light, your bonsai will become leggy, weak, and unable to produce the healthy new growth that makes it look vibrant.
How to Fix It:
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Provide Adequate Light: Most bonsai trees need at least 4–6 hours of indirect sunlight daily. If your bonsai is in an area with low light, consider moving it to a brighter spot or using a grow light to supplement natural sunlight.
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Adjust Light Based on Species: Some bonsai trees, like Ficus or Chinese Elm, tolerate low light better than others, while conifer species may require more direct light.
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6. Improper Pruning: Overdoing or Underdoing It
The Problem:
Pruning is one of the most important aspects of bonsai care, as it helps shape the tree and remove dead or damaged growth. However, improper pruning can cause harm. Over-pruning can stress the tree, while under-pruning can lead to excessive or unruly growth.
How to Fix It:
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Prune Regularly, But Gently: Trim away dead, damaged, or unhealthy branches. Focus on thinning out the tree to encourage airflow and light penetration. Don't remove too much at once—this can shock the tree.
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Use the Right Tools: Make sure you're using sharp pruning shears for clean cuts. A concave cutter is ideal for cutting branches without leaving unsightly scars.
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7. Not Fertilizing Regularly: Feed Your Tree Right
The Problem:
Bonsai trees, though small, still need nutrients to grow and stay healthy. If you neglect to fertilize your tree, it can become weak and stop growing.
How to Fix It:
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Fertilize During Growing Season: Feed your bonsai regularly during the growing season (typically Spring and Summer) with a balanced bonsai fertilizer. Avoid fertilizing in the Winter when the tree is dormant.
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Organic Options: Consider using organic fertilizers like fish emulsion or worm castings. These natural options can be easier on the roots and provide a steady supply of nutrients.
Conclusion: Patience and Consistency Are Key
Caring for a bonsai tree requires patience, attention, and consistency. If you’ve encountered any of the issues mentioned above, don’t worry, many of them are easily fixable. By avoiding these common mistakes and applying the correct care, your bonsai tree will thrive and continue to be a beautiful addition to your home.
At Hagabon.com, we’re dedicated to helping you succeed in your bonsai journey. From bonsai pots and tools to premium soil mixes , we offer everything you need to support your tree’s health and beauty. If you're unsure about anything or need expert advice, don’t hesitate to reach out to our customer support team.
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Explore our full selection of bonsai pots, tools, and soil mixes at Hagabon.com.