Author Topic: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)  (Read 5265 times)

LarryAldrich

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Hello all,
I have been growing this Cryptomaria in potting soil for about eight years. It spent 2013in the ground but suffered a lot of sun damage.  I pulled it from the ground and put it back in potting soil spring 2014.I recently cut out all the dead and dried up inner foliage in the lower portions of the tree.

I am interested in developing it as a shohin sized tree. My plan for next year is to move it into bonsai soil in either a box or nursery pot and see how much new growth might develop. Im thinking box so I can spread out the roots. Does that seem to soon to repot?  Can I also do some trunk chops at that time?

I have found very little information about developing cryptomarias beyond rough generic stuff so I'm thinking there might be a lot of trial and error. 

I've included photos of overall tree root spread and healthy new growth.

Thanks in advance for any advice.
Larry Aldrich
Seattle WA
 

Owen Reich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #1 on: September 15, 2014, 04:27 PM »


Here's some information via an Episode Bjorn made on Cryptomeria.  You have to set the framework and have a healthy tree before these techniques can be applied regularly.  The pinching of tips even on younger Cryptomeria will increase ramification though.  Variegated and dwarf tsugi do grow slower, so if you are inclined to chop a bunch of branches off, you'll be waiting a while for a pleasing form.  May be better to get another one; especially considering most in the country are produced close to you.  Not saying your's is bad, just something to consider if you have a good idea of final desired form and that one is way off.

A shallow, wide grow-box with good drainage on bottom and somewhat higher moisture retention than the average conifer mix is best IMO.  They really do not like cold, drying wind.
« Last Edit: September 15, 2014, 04:30 PM by Owen Reich »
 

LarryAldrich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #2 on: September 16, 2014, 10:20 AM »
Thanks for the information Owen, I really appreciate your response. I think I'll move forward with this tree and keep my eyes open to see if can find a better specimen.
 

Owen Reich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #3 on: September 16, 2014, 01:08 PM »
that one has potential  :)
 

LarryAldrich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #4 on: September 17, 2014, 12:11 AM »
Oh, I guess I slightly misinterpreted your opinion of the tree then, thanks.
 

LarryAldrich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #5 on: September 17, 2014, 12:20 AM »
Owen, the standard mix I get from my local bonsai nursery is pumice, Lava and pine bark. I screen it rinse it and dry it prior to planting. What would you recommend to increase moisture retention? 
Again, thanks for the advice.
 

Owen Reich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #6 on: September 17, 2014, 02:09 AM »
That sounds ok if that works with your watering and timeframe for results.  Some use milled peat moss, granite grit, and Akadama.  But, that's in the southeast.  I don't use bark ever any more.  You can get away with a faster mix IMO but they hate to dry out fully.  Tough to say really.  I'd ask a seasoned local like David Degroot.
 

LarryAldrich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #7 on: September 17, 2014, 08:52 AM »
  You can get away with a faster mix IMO but they hate to dry out fully.

Owen, I'm not sure what you mean when you say a "faster mix"? 

 

Jason E

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #8 on: September 17, 2014, 08:55 AM »
up the ratio of akadama in your own mix of pumice, lava, akadama. Get away ffrom the bark.

J
 

LarryAldrich

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #9 on: September 17, 2014, 09:19 AM »
up the ratio of akadama in your own mix of pumice, lava, akadama. Get away ffrom the bark.

J

Jason, does that make the soil dry out faser, or the tree roots grow faster. I will start making my own mix once I'm through all the BNW mix with bark I have. 
 

Jason E

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Re: Cryptomeria japonica 'Knaptonensis' (White Tip Japanese Cedar)
« Reply #10 on: September 17, 2014, 06:26 PM »
up the ratio of akadama in your own mix of pumice, lava, akadama. Get away ffrom the bark.

J

Jason, does that make the soil dry out faser, or the tree roots grow faster. I will start making my own mix once I'm through all the BNW mix with bark I have. 

That sounds like a trick question :) Soil drying out depends on a bunch of stuff- foliage mass, size of container, growth, particle size, temp, top dressing, etc.... growth rate of the roots I imagine the same thing- a lot of factors

2:1:1 akadama pumice lava mix is what the mix we were using for Fir, Spruce, Hemlock, Cedar, etc..
And I have noticed it staying damp longer than the 1:1:1 mix I have most of my trees in.

this topic is huge, and you could read or debate for days. Above is just what I've learned and use.