Author Topic: Field growing vs large pots?  (Read 8632 times)


  • Hero Forum Member
  • *****
  • Posts: 897
Re: Field growing vs large pots?
« Reply #15 on: August 29, 2012, 10:35 AM »
Interesting thread, and Thanks Owen for the pics and explanations.  May I ask the time of the year that the root pruning takes I place as well as when to do the selective pruning?  And what do you mean by "undercutting" the roots when the trees are planted above ground (to me it looks like about 6")?  I have sev JMs, Tridents, Ch Elms, and shimpaku's that I put in the ground this spring. They have all exploded with new growth exc. the shimps, they have only grown a bit (John, incl. that one I stapled the roots to plywood if you recall lol)  I need to relocate some as I didn't think it the planting spots very putting the JMs in the front of the Shimpaku's, which blocks othe sun to the Shimpakus. Live and learn lol

Alain Bertrand

  • Jr. Forum Member
  • **
  • Posts: 67
  • Thanked: 1 times
Re: Field growing vs large pots?
« Reply #16 on: August 29, 2012, 05:34 PM »
They are  :).  Guessing you've been here before? 
You're right ;) I go there from time to time, I was there 2 weeks ago but hadn't the time to go to Koukaen.

Owen Reich

  • Hero Forum Member
  • *****
  • Posts: 888
  • Thanked: 7 times
Re: Field growing vs large pots?
« Reply #17 on: August 29, 2012, 11:53 PM »
Not sure on the timing of the root pruning.  I'd imagine Fall before the last big flush of root growth before winter.  Or, Spring a little before buds swell on deciduous trees.  I'll try and find out.  Under-cutting refers to cutting of the roots a little below or even level with the channels between beds.  Those channels can be flood irrigated or soaker hoses run on top of the mounds depending on water needs and maturity of stock.  Pruning of large branches is another timing issue I'm unfamiliar with as I'm not in the niwaki biz   :'(.

The Japanese field growers I've observed put a really small rootball on their trees.  Saves on freight and most niwaki are compact anyway.  This periodic root pruning while in production aids in creating a smaller rootball; hence me mentioning it for use in bonsai. 

Beds for larger trees are really tall.  Those shown are for young material.  Closer to finished and finished niwaki are often relocated to a separate bed where a crane can access them from the road.