Autumn Work - Soji!

Share your success stories about defoliation, bare rooting and anything else relating to maintaining healthy bonsai.
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Scott Roxburgh
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Autumn Work - Soji!

Post by Scott Roxburgh »

Recently, a good friend of mine has given me the opportunity to work on a mature pine that she has had in her collection for quite some time.

Over the last few weeks I have noticed that when watering, the water often pools on the surface and runs off the edge of the pot rather than penetrating deep into the pot, and wetting the entire rootball.

In light of this, today I decided it was time to perform Autumn Soji on the tree. 'Soji' is 'to clean' in Japanese. I use the term in reference to the top 2-3cm of the soil in the pot.

Before Soji:
Before soji.jpg
Before soji back.jpg
First thing we do is get out the bent nose tweezers and rake the top of the root ball outwards. That it from the centre of the pot to the rim. (I just realised i didn't capture pictures of this :palm: the reason that we rake outwards, is that it only damages the crossing and unattractive roots. It should also be note that if there are any small roots crossing or growing upward etc this is a great opportunity to cut them off. Large roots are cut at repotting.

Post Soji:
Post soji.jpg
Post soji back.jpg
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Last edited by Scott Roxburgh on April 20th, 2011, 7:29 pm, edited 1 time in total.
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

To help the water penetrate the rootball more thoroughly I 'cored' the rootball:
coring the rootball.jpg
coring the rootball 2.jpg
Next, I added a layer of Osmocote:
Osmocote layer.jpg
Then sieved the new 'top soil' (Akadama/Diatomite/Zeolite with a little charcoal and granite added, it would be 50:50 Akadama/Pumice but I have run out and need to get back to Sydney to pick up some more):
new soil.jpg
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Scott Roxburgh
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

Next up, adding the new soil:
replacing soil.jpg
replacing soil 2.jpg
After Soji:
after soji.jpg
After soji back.jpg
Fertilizer replaced:
Fertiliser replaced.jpg
Watered thoroughly:
Post watering.jpg
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Re: Autumn Work - Soji!

Post by Joel »

Interesting technique. Was the stuff you removed from your previous mix used throughout the rootball or did you have two mixes present in the pot at once? Where do you purchase pumice in Sydney?

Thanks,
Joel
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

Hi Joel,

The 'old' top layer of soil was a mix of brickdust as a dressing, potting mix/gravel/Zeolite/brickdust. This is not the mix that I use, but what the pine was in (still is in except the top 2-3cms)

I use Akadama/Pumice/Charcoal/Granite, a larger size for pines, smaller for Deciduous, and smaller still for the top soil (this work).

I get Pumice from:
http://www.australianperlite.com/pumice ... ulture.htm

This year I will be getting a much larger amount than last year.

A link to a student of Boon, performing soji in Summer:
http://bonsaitonight.com/2010/08/27/summer-soji/
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Re: Autumn Work - Soji!

Post by kcpoole »

H3ey Joel you beat me to it :-)
I was going to ask where to get pumice as I have never been able to find it :-)

Thanks Scott

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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

Group buy...it is a lot cheaper if we buy a large bag and distribute it out, Im happy to buy a lot!
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Re: Autumn Work - Soji!

Post by Jester »

Hey scott, what are those 3 white chunks on top of the soil that look like turkish delight ???
Last edited by Jester on April 21st, 2011, 9:46 pm, edited 1 time in total.
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Re: Autumn Work - Soji!

Post by kcpoole »

Scott Roxburgh wrote:Group buy...it is a lot cheaper if we buy a large bag and distribute it out, Im happy to buy a lot!
How Much is it? They did not have prices on the website
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

Jester wrote:Hey scott, what are those 3 white chunks on top of the soil that look like turkish delight ???
Fertiliser - Tea bags filled with soybean meal and blood and bone.
kcpoole wrote:
Scott Roxburgh wrote:Group buy...it is a lot cheaper if we buy a large bag and distribute it out, Im happy to buy a lot!
How Much is it? They did not have prices on the website
I cant remember prices but I'll call them to check.
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Re: Autumn Work - Soji!

Post by GavinG »

Scott, could you possibly bring a sample of the pumice to the May meeting? It looks very interesting....

Many thanks,

Gavin
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Re: Autumn Work - Soji!

Post by Scott Martin »

Scott,

Now you've done this, will you still plan to repot in Spring or will this extend the time until the next repot?

Cheers
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

nitram72 wrote:Scott,

Now you've done this, will you still plan to repot in Spring or will this extend the time until the next repot?

Cheers
Repotting can still be done in spring.

This work is generally done to remove the build up of organic fertiliser waste on the soil surface, but I have used it in this case to increase the drainage of the tree.

I may remove a small section of the existing soil this year and slowly replace the entire rootball over the next few years...
GavinG wrote:Scott, could you possibly bring a sample of the pumice to the May meeting? It looks very interesting....

Many thanks,

Gavin
What you see above isn't pumice...I haven't got any left.

I'll try and sift some out of one of my pots and bring it along...it may be a small amount though.
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Re: Autumn Work - Soji!

Post by Scott Roxburgh »

kcpoole wrote:
Scott Roxburgh wrote:Group buy...it is a lot cheaper if we buy a large bag and distribute it out, Im happy to buy a lot!
How Much is it? They did not have prices on the website
$19 per 20kg bag or $14.85/bag if you buy a pallet of 50 bags.
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