Bonsai Tonight

Repotting a shore pine

Posted in Bonsai Development by Jonas Dupuich on January 3, 2014

The shore pine is kin to the lodgepole pine. Both are native to California and parts north, but the exact relationship is open to some debate (see Pinus contorta for details). Shore pine bark is great, if slow to develop, and the needles are relatively short. Not strong enough to withstand decandling, it can be trained like white pine varieties. In fall I remove strong shoots from the strong areas and leave the weaker areas alone. At some point before spring, I remove old needles from the strongest shoots.

I’ve been working on the specimen below for the past two years. As it hadn’t been repotted in some time, I changed the pot after removing the old needles.

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Shore pine

Current and last year’s needles

After removing (with scissors) last year’s needles

As I packed up my things the morning of the workshop, I grabbed a pot that seemed to be the right size without looking too closely at it. After working on the tree’s roots, I took the pot outside to clean it and noticed that I’d grabbed a fairly old Chinese container. A bit much for a growing pot? Possibly, but then what’s the fun of saving old pots for exhibits? As the size was right and I’d brought no alternatives, I went ahead and used the old pot.

After repotting

The old pot

I’ve been happy with the selection since bringing the tree back home, and as it’s a bit larger than the previous pot, the new roots will have plenty of room to grow.

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Tamping the soil into place

Posted in Bonsai Development by Jonas Dupuich on October 25, 2013

After wiring a bonsai into the pot and filling the pot with soil, I’ll usually give the whole a few gentle taps to make sure I did a good job with the chopsticks. A few gentle taps can quickly reveal faulty chopstick work as the soil will quickly settle in neglected areas. I usually tap at least two sides of the pot while securing the base of the tree with my other hand.

Settling the soil


Tap a little bit too hard and the soil can pop out of place leaving the tree loosely secured and requiring starting the process all over again.

For the last step, I tamp the soil into place with my hand. Many wonderful and miniature trowels are made for the purpose, but hands can work well too.

Settling the soil

Tamping the soil

Is this last bit necessary? Good question. I’ve noticed that when I water after repotting, the soil tends not to move around as much after tamping the soil like this, and for this reason alone I continue to do it.

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Wiring a tree into the pot

Posted in Bonsai Development by Jonas Dupuich on October 22, 2013

Some of the final steps when repotting bonsai are among the most important – especially when it comes to wiring trees into the pot. I typically wire trees into the pot after setting the tree, but when repotting partially or completely bare-rooted trees, I first work some soil into the exposed roots. If no soil is around to hold these roots in place, tightening wires can scrunch roots together, collapsing the rootball and making it difficult to secure the tree firmly in the pot. As I bare-rooted about a third of the roots of the tsukumo cypress below, I filled in the areas between the open roots and around the rootball before starting with the wire.

Wiring the tree into the pot

After adding enough soil to facilitate wiring the tree into the pot

There are several approaches to wiring bonsai into pots, each with their good points depending upon the application. For this tree, I used my default approach for posts with four holes. Taking hold of the front left wire, I brought it to the point where the front right wire emerged from the soil.

Wiring the tree into the pot

Bringing the wire across the front of the rootball

Where the wires meet I twist them together by hand. If I want to make sure the wire is particularly snug at this point, I use pliers.

Wiring the tree into the pot

Grabbing the wire with pliers

If there is a single take-away from this post, let it be this: pull, then twist. If you have ever repotted bonsai with Boon Manakitivipart, you’ve doubtless heard this phrase. The idea is that when tightening wires, first pull the wires tight, then slightly release the tension while twisting. Simply twisting soft wire like aluminum is an easy way to break it. The alternative: pull, then twist.

Wiring the tree into the pot

1. Pull wires away from rootball

Wiring the tree into the pot

2. Lower pliers while twisting

The pull, then twist, approach may be repeated until the wire is snug. After securing the first three wires, you may notice you have nowhere to attach the final wire.

Wiring the tree into the pot

Where does this one go?

Sometimes I plan ahead by preparing a short section of wire with a loop that I can fit around the first wire.

Wiring the tree into the pot

Short wire with loop

As I didn’t prepare this bit ahead of time, I can do it after the fact with a short, hooked section of wire.

Wiring the tree into the pot


I hook this wire under the base of the first wire and then twist it back onto itself.

Wiring the tree into the pot

Hooking the base of the first wire

Wiring the tree into the pot

After securing the wire with a twist

Adding this tail let’s me connect the first wire with the final wire. For this final connection, I always use pliers to ensure the tree is well-secured to the pot.

Wiring the tree into the pot

The last connection

Tightening this last connection ensures the wire is tight across the entire rootball. Once the wire is snug, I remove any excess strands and fill the rest of the pot with soil.

Wiring the tree into the pot

After adding the soil

Two more quick steps – more on that Friday – and then it’s time to water.

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Setting the tree

Posted in Bonsai Development by Jonas Dupuich on October 18, 2013

When repotting bonsai, I try to keep roots exposed to air for as little time as possible. When I know what pot a tree will be planted in ahead of time, I’ll add wire and screen to the pot before I begin the rootwork. I knew I’d plant my sawara cypress into a terra cotta pot ahead of time so I began the process by adding screen and wire (2mm aluminum) to the pot.

Pot prepared

Pot prepared

When I was finished with the rootwork, I started adding soil to the pot. I began with a drainage layer of pure pumice.

Drainage layer

Pumice drainage layer

I then added some bonsai soil, creating a small mound on which I placed the rootball.

Bonsai soil

Bonsai soil in the bottom of the pot

Next comes the tricky process of setting the tree. Mound up too much soil and the surface roots will be exposed to the air. Mound up too little and the base of the trunk gets buried. Once the soil level is correct, I nestle the tree into place with a gentle twisting action. After the twisting, the tree should come to rest at the idea height, centered equidistant from all edges of the pot, and set at the proper planting angle.

This often requires more than one pass. If, after nestling the tree into the soil, the base of the trunk is too low, I remove the tree, add more soil, and repeat the process until I get the level right. I never mind taking my time with this stage as it’s far easier to correct mistakes here than it is once the tree is planted.

Setting the tree

Boon gently twisting a dwarf sawara cypress into the pot

Setting the tree

Checking the planted angle

Setting the tree

Making further adjustments

Setting the tree

Once again checking the level

When planted at the appropriate level, I can fill the pot with enough soil to just cover the surface roots without filling the pot to the rim.

Tree set at proper level

Tree set at the proper level

Tree set at proper level

After adding bonsai soil

What about wiring the tree into the pot? Details next week.


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