Bonsai Study Group Forum

Species Specific => North American Juniper Bonsai Discussion => Topic started by: dre on September 21, 2012, 09:50 PM

Title: repotting a needle juniper
Post by: dre on September 21, 2012, 09:50 PM
any advice on repotting needle juniper as i have one that is going to need repotting this coming spring and i don't want to loose this tree. i've heard these trees are very sensitive to repotting please give some advise
Title: Re: repotting a needle juniper
Post by: John Kirby on September 22, 2012, 08:13 AM
Picture, size and how long since it has been repotted? just being nosey.
Title: Re: repotting a needle juniper
Post by: Yenling83 on September 26, 2012, 06:32 PM
You might want to check out Boon's repotting video.  Great info and it's easy to follow along with him to make sure you are repotting correctly.  Depending on the state the tree is in, repotting may be different with what type of soil and container you will use.  A picture would be good so more help can be given.   
Title: Re: repotting a needle juniper
Post by: dre on October 07, 2012, 08:08 PM
i know how to repot trees as i have done numerous repots but needle juniper is a sensitive tree to repot
Title: Re: repotting a needle juniper
Post by: Owen Reich on October 08, 2012, 08:11 AM
Juniperus rigida are always repotted almost last here.   The needle juniper is on the tail end of our repotting season (early Spring) as follows:

Pseudocydonia - Beech - Ume - most other deciduous (as buds pop) - Shimpaku and most other conifers - Chamaecyparis and Cryptomeria (after leaves green up) - Juniperus rigida (as first buds swell) - Gardenias and Camellias - Tropicals.

They do not like to have their roots disturbed when it's cold (that is true for us in Osaka).  Many needle junipers have died from repotting too early; maybe just feeble looking at first, but by mid-summer, toast. 

Sounds like I need to watch Boon's DVD's.....  It's good to have insight into the quirks of plants in your climate zone.  Nashville is anything but like San Francisco though  :-\.
Title: Re: repotting a needle juniper
Post by: dre on October 09, 2012, 05:07 AM
owen so what time do you repot your needle juniper and what are the step you do when repotting as much info you can give would be great 
Title: Re: repotting a needle juniper
Post by: Owen Reich on October 09, 2012, 11:51 PM
In Osaka, which is about on par with Nashville, Tennessee we repot Juniperus rigida based mainly on the given tree's behavior (as new buds start to swell).  This can be roughly between the last week of April and mid-May.  Other bonsai professionals repot between mid-February and early March.  They may have their tosho in a climate controlled or buffered environment like a poly tunnel / greenhouse.

As for any other details, we try not to cut off too many roots.  Hard to discuss on a forum.  Easier to show you in person as root system needs to be evaluated.  Most important thing is not hack up the roots and to give the tree good drainage and water frequently.  We add a pinch or two of charcoal on top of the drainage layer.
Title: Re: repotting a needle juniper
Post by: dre on October 10, 2012, 09:05 AM
wow owen i didn't realize who i was talking to i google your name and some of your youtube videos pop up i faithfully watch that series but any how im so nervous to repot this juniper cause i don't want it to die as i repotted a needle juniper i worked on with nick lenz and i dint know needle juniper isn't like other junipers and like you said it looked fine at first then wamo its gone. how you said it would be easier to show you in person if your serious about that as i would go to you cause i really want to learn the proper way to repot a needle juniper cause i just love these trees  
Title: Re: repotting a needle juniper
Post by: Mike T on October 12, 2012, 06:42 PM
Hi Dre,
I found this site recently and here goes my first post!  I acquired a needle juniper in the spring and in researching the tree I found these articles on Peter Tea's blog.  They don't really get into specifics on re potting needle junipers but they are informative nonetheless.  I have not re potted mine yet so I am interested in how it goes for you.  Thanks.

http://peterteabonsai.wordpress.com/2011/08/08/tosho-part-1/ (http://peterteabonsai.wordpress.com/2011/08/08/tosho-part-1/)
http://peterteabonsai.wordpress.com/2011/08/08/tosho-part-2/ (http://peterteabonsai.wordpress.com/2011/08/08/tosho-part-2/)

Mike T
Title: Re: repotting a needle juniper
Post by: dre on October 12, 2012, 07:53 PM
mike t it looks like im going to hire owen reich when he is back in the states from japan to show me to proper way to re pot the needle juniper. i've re potted all my other junipers and pine and yews and larches without problem but the needle juniper im nervous as i here they are sensitive to having there roots messed with
Title: Re: repotting a needle juniper
Post by: Mike T on October 13, 2012, 09:42 AM
Thats cool, please pass along any tips as I will be re potting mine in the spring.  Thanks.
Title: Re: repotting a needle juniper
Post by: John Kirby on October 13, 2012, 11:28 AM
I guess the keys need to be remembered- 1) repot them after it has warmed up and they have started to green up on the tips, 2) make sure that they are clean of all field soil or old potting medium/decomposed akadama; and put them in to a good moisture retentive yet rapidly draining soil mixture; 3) until the root system is completely fine roots, be careful to limit your pruning up into the root ball to strategically stimulate new fine root growth.

Revigorating the roots is key to keeping them in tune with the top of the tree. Needle junipers (Tosho) like hot, humid climates, if we keep them in cooler places we nee to be really sure that we manage our activities around more suitable timing and/or moving into heated greenhouses/structures prior to and after repotting.

I think hiring a professional is a very good idea if you have concerns, but you will need to be sure to get your timing right so that you don't place the professional in a difficult situation due to the climate.
Title: Re: repotting a needle juniper
Post by: dre on October 13, 2012, 09:32 PM
ya john me and owen where talking timing is key and its ruffly april may
Title: Re: repotting a needle juniper
Post by: boon on December 31, 2012, 12:54 PM
Tosho is different from other juniper.  refined trees are repotted after first pruning of the new foliage that year.  which will be in late spring early summer.  when i studied in Japan, we repot them around the end of may to mid june.  we leave them under 30% shade cloth or leave out in full sun.
we do repot also in winter if we put the tree in the winter show.
Title: Re: repotting a needle juniper
Post by: dre on December 31, 2012, 01:15 PM
so boon are you saying that the date me and owen have of april 13ish is not a good time. cause that is what owen said is what they do in osaka.
Title: Re: repotting a needle juniper
Post by: boon on December 31, 2012, 01:42 PM
tosho like heat and water.  we used clay king while i was there.  and yes we repot at the end of May till mid June.  Tosho is the only thing we repot at that time.  Daisaku, my senior, is comine here soon.  i can ask him and let you know later.
Title: Re: repotting a needle juniper
Post by: Owen Reich on December 31, 2012, 06:44 PM
In our message exchanges off-forum, we discussed repotting as new buds swell.  If the tree isn't active at the time, then it is not ideal.  Hard to predict weather in your area.  As Boon said, tosho love heat and water. 

Title: Re: repotting a needle juniper
Post by: dre on December 31, 2012, 08:57 PM
owen thats why i said april 13ish
Title: Re: repotting a needle juniper
Post by: John Kirby on January 01, 2013, 11:36 AM
If you are going to engage a professional, you need to do everything possible to get the material ready to work. You may want to move your Tosho into heated space (greenhouse) for 4-6 weeks before the professional arrives, repot the tree and then return to heated space until the weather stabilizes. A number of nurseries in the area could provide for fee boarding to accomplish this. John
(Yes Owen I am referring to you as a professional. Good luck.)
Title: Re: repotting a needle juniper
Post by: dre on January 01, 2013, 06:12 PM
john one of the reasons owen is coming is to help me with the repotting of the tosho cause i know they are sensitive to repotting ive repotted juniper larch pine yews with no problem before. i just dont want to loose this tree cause it a very nice tree and i have seen one like it in the stated before
Title: Re: repotting a needle juniper
Post by: dre on January 02, 2013, 09:51 AM
why john are you saying it is bad to have a professional come to help and guide you threw the process of repotting a species that you haven't repotted before and you know is sensitive to repotting.
Title: Re: repotting a needle juniper
Post by: John Kirby on January 02, 2013, 10:39 AM
Read what I wrote, I am saying don't schedule a professional and not have the material ready. That means have the material ready. In this case, you want to repot a tosho. Make sure the tosho is ready, put it in a warm humid environment to get it growing, before the rofessional comes to work, let them work on it, then put it back into the warm and humid environment to keep it growing after it is worked on. Period. Then the difficult NE environment will play no role in your activities.

I am very fortunate to get help with some of my repotting, and personally believe that you can learn a great deal by working with a professional.

Title: Re: repotting a needle juniper
Post by: dre on January 02, 2013, 11:07 AM
oh ok ya cause me and owen set the date and would be moved if needed but now with what your saying i could control when the tree starts growing i really didnt think of that as i really like to stay away from doing things like that mainly cause i remember a couple years back when i went to the mid atlantic some people that were showing larches did that so they would be green for the show and i will tell you they didn't look good they all looked weak
Title: Re: repotting a needle juniper
Post by: John Kirby on January 02, 2013, 01:22 PM
Um, you know when Tosho in cold climates are shown in the winter (Kokufu-ten) they are placed in warm conditions to green up?

Antway,  Ive saidenough.
Title: Re: repotting a needle juniper
Post by: dre on March 10, 2013, 11:19 PM
just got the pot for this juniper that was commissioned. this is my first ron lang pot and i could tell you i'm so impressed by the craftsmanship of this pot