We spend a lot of time talking with many new bonsai enthusiasts. Every time the topic of re-potting comes up, we inevitably hear the following two questions (usually in quick succession): "How do I repot my bonsai?" and "When should I repot my bonsai?"
It can be an intimating thought. The vague answer is that it depends on the type of plant and the particular growing location. In general, it is best to repot right before your bonsai begins growing vigorously. In most cases this is spring.
However, there are exceptions to every rule, so you should consult an expert to really determine what the best re-potting season is for your particular bonsai.
How often should I repot?
You need to consider a number of different factors. As the top of your tree grows, so do the roots. All bonsai need to be re-potted (and root pruned) to maintain good health. For the roots, trimming gives them room to grow. At the same time, this is a good chance to replace old, worn out bonsai soil.
Some other factors to consider:
Some plant species are more prolific root producers than others. Others can go years between re-potting.
Young trees or trees in small bonsai pots need more frequent root pruning.
Plants in very shallow pots do not have very much depth for roots to expand.
Some tropical trees that experience a year-round growing season can fill up the pot with roots very quickly.
What do I need?
So, it's time to repot. Here are a few pointers to get you going.
A new pot. If you are not using the same pot, you will need a suitable pot, usually an inch or bigger on all sides.
Bonsai soil. Bonsai soil - not regular potting soil - is essential because regular potting soil is too dense. Also, be sure to use a premixed bonsai soil, or if you are mixing your own, make sure you get some professional advice on the right components.
Basic tools. You will also need some basic tools for the re-potting process:
A root rake or root hook for combing out the roots.
Pruning shears for cutting the roots.
A mesh or screen to cover the holes of the pot.
That's it! Now you're ready to start the re-potting process!
How do I re-pot my tree?
First, relax and take a deep breath. You're going to be fine, trust us.
Good. Now that you're ready, start by lifting the tree out of its pot. The root mass will probably have assumed the contours of your pot; if so, you will probably see a heavy mat of roots on the bottom of the root ball.
Then, with your root hook, gently loosen and comb out the bottom third of the root ball.
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With a sharp pair of pruning shears, cut off combed off this bottom third of the root ball.
Be sure to cut and shorten the large heavy roots. Remember, a bonsai's most important roots are the small, fine feeder roots.
Now prepare your bonsai pot with mesh or screen covering the drainage holes. Sprinkle a fresh layer of soil in the bottom of the pot, with a mound of soil right in the middle.
Place the tree in its original position (or the best position possible), taking care to spread the roots out evenly.
Add more soil and work it in among the roots with your root hook. Make sure that all the soil settles in and that there are no air pockets.
Then, soak the tree in its pot using the immersion method. (For more watering tips, please refer to our Watering Tips articles.)
After the repotting process, let the tree recover for a couple of weeks out of full sun and wind. Do not fertilize until new growth starts to emerge. Water only to keep the entire root/soil mass moist - not soggy.
And, you're done! Now that wasn't so hard, was it?
Associated tools for re-potting:
Bonsai pot
Root hook or a root rake
Mesh
Fertilizer. Fertilizer is one of the most important maintenance supplies you will need. There are many different types of fertilizer to choose from, so educate yourself to make sure you pick the one that is right for your bonsai. Popular choices include organic fertilizers or liquid fertilizer with a fish/seaweed base.
Extra bonsai soilRemember, you will probably have to replace soil that washes away, so it's a good idea to have extra soil on hand. It is best to use a soil that is similar to the one your bonsai is already potted in.
DISCLAIMER: The content provided in this article is not warranted or guaranteed by Bonsai Outlet. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. Happy bonsai gardening.
As an avid bonsai enthusiast with years of hands-on experience and a deep passion for the art of bonsai cultivation, I can confidently share insights into the intricate process of re-potting bonsai trees. My expertise in bonsai care has been honed through countless hours of experimentation, learning from seasoned practitioners, and achieving successful outcomes in maintaining the health and beauty of various bonsai specimens.
Now, let's delve into the key concepts presented in the article:
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Re-potting Timing:
- The optimal time to re-pot your bonsai is generally in spring, just before the vigorous growth period begins. However, exceptions exist based on the plant species and growing location.
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Frequency of Re-potting:
- The frequency of re-potting depends on various factors, including the growth of the tree, the type of bonsai soil used, and the size of the pot. Young trees or those in small pots require more frequent root pruning.
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Factors Influencing Re-potting:
- Some plant species are prolific root producers, while others can go several years between re-potting. Shallow pots and tropical trees with a year-round growing season may require more frequent attention.
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Materials Needed for Re-potting:
- When re-potting, essential materials include a new pot (larger than the existing one), bonsai soil (specifically formulated for bonsai), and basic tools such as a root rake or hook, pruning shears, and a mesh or screen to cover pot holes.
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Re-potting Process:
- The re-potting process involves carefully removing the tree from its pot, loosening and combing out the roots, cutting off the bottom third of the root ball, preparing the new pot with fresh soil, spreading the roots evenly, and soaking the tree using the immersion method.
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Post-Re-potting Care:
- After re-potting, allow the tree to recover for a couple of weeks in a shaded area, avoiding full sun and wind exposure. Refrain from fertilizing until new growth appears, and water to maintain soil moisture without making it soggy.
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Associated Tools:
- Key tools for re-potting include a bonsai pot, root hook or rake, pruning shears, bonsai soil, mesh, and fertilizer. Having extra bonsai soil is recommended for replenishing what may wash away during watering.
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Fertilizer:
- Fertilizer is crucial for maintaining bonsai health. Various types are available, such as organic fertilizers or liquid fertilizers with a fish/seaweed base. Choosing the right fertilizer depends on the specific needs of your bonsai.
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Disclaimer:
- The article ends with a disclaimer, emphasizing that the provided content is for entertainment and educational purposes. It also advises readers to exercise caution and not hold the source liable for any negative consequences resulting from implementing the information.
In conclusion, successful bonsai re-potting requires a combination of knowledge, skill, and the right tools. By following these guidelines and considering individual tree characteristics, enthusiasts can contribute to the long-term health and aesthetic appeal of their bonsai creations. Happy bonsai gardening!
