Bonsai Tonight

Feed me!

Posted in Bonsai Development by Jonas Dupuich on March 13, 2015

What’s wrong with this picture?

Cork bark black pine

Cork bark black pine

The tree is growing, but there is no sign of fertilizer.

Cork bark black pine

With tea bags filled with cottonseed meal

That’s better. The sooner I can start fertilizing, the stronger I can make the tree by decandling time.

I enjoy seeing the male flowers on pine, despite the mess. Here is the tree from the back and sides.

Cork bark black pine

Left side

Cork bark black pine

Back

Cork bark black pine

Right side

I usually start with 1-2 units of fertilizer for small sized trees and 3-4 units for larger trees. I treat young and middle-aged trees the same.

Black pine

11 year-old black pine

Black pine

21 year-old black pine

While it’s more common to hold off on fertilizing deciduous varieties to avoid long internodes and large leaves, I make some exceptions.

Japanese plum

Japanese plum

My plum is the first tree to show signs of growth each year, and if I don’t start feeding quickly, the leaves turn yellow.

Why mention fertilizer so early in the season? Because the sooner fertilizing begins, the more vigor can be produced in a given year. While this can be important for all varieties, it’s especially important for pines that are to be decandled as there’s only so much time between repotting and decandling.

I usually wait three weeks after repotting to begin fertilizing. My standard fertilizers are fish emulsion and cottonseed meal, but this year I’m planning to use a greater variety of fertilizers to ensure the trees get a broader variety of nutrients.

Is it time to start fertilizing in your garden?

Time for a smaller pot

Posted in Bonsai Development by Jonas Dupuich on March 10, 2015

First develop the trunk, then work on the branches. That’s how I think about bonsai development. If the trunk has yet to reach its final size, I use large pots and encourage vigorous growth. When I’m happy with the trunk, I move trees to smaller pots and focus on refinement.

A number of my black pines turn 11 this year. A few have reached the desired trunk size. I’ve been slowly removing large escape branches and am now ready to move the trees to smaller pots.

In general, if the soil is good, it’s easy to use a smaller pot as the root ball will have fine roots throughout. If not, the tree will have to stay in an intermediate-sized pot until enough fine roots develop to support the tree in a smaller space.

Here are two of the 11 year-old pines I repotted this winter – both were container grown.

Black pine

Exposed root black pine – 11 years old

Black pine

After repotting

Black pine

11 year-old black pine

Black pine

 

After repotting – note how the trunk looks larger in a smaller pot

Yes, Northern California is in the middle of a mild winter and most of my pines are already growing. As I repotted these trees about a month ago, I can start fertilizing now to make sure they’re strong enough to be decandled come spring.

Ever wondered what it’s like to be a bonsai apprentice in Japan? For those who haven’t done so already, feel free to submit questions to Juan Andrade, the Costa Rican bonsai artist studying at Aichi-en in Nagoya, Japan with Junichiro Tanaka, via AMA scheduled for later today (Wednesday Japan time) at Ask Bonsai Tonight.

Tagged with: , , , ,

Too much of a good thing

Posted in Bonsai Development by Jonas Dupuich on March 6, 2015

As I worked my way through the repotting of many pines this winter, I found a young specimen that’s beginning to take shape. Nice, I thought, it even has a good root base. Then I looked closer.

Black pine

Black pine – 11 years from seed

Up close, I found that the roots were actually a bit much for the tree.

Root base

Surface roots

Is this really a problem? Not necessarily. If the idea is to let the tree grow for another 10 years to thicken the trunk, it would be possible to change the relationship between the trunk and the root base over time. If the idea is to make a shohin bonsai, it would be tricky to find a pot for the tree. I’m not sure where the tree is headed at this point, but for my taste, I prefer the roots to enter the soil closer to the base of the trunk.

Root base

Chopsticks highlight the ratio of trunk to root base

From the side, the ratio of trunk to root spread looked even more out of balance.

Root base

Root base from the side

Root base

Chopsticks indicate the root spread

What to do? One thought is to let the trunk thicken. Another is to slowly reduce the root base. For now, I’ll pursue both options – minor surface root reduction and increased trunk size. That means several more years of vigorous growth for the trunk, and attention to detail during repotting to take what opportunities I can to reduce the root spread a bit.

Would it be ok to to nothing and continue to develop the tree as is? Yes. It could be that the wide root spread could become an interesting feature that makes for a unique tree. After this year’s repotting, I’ll have a few years to think about it.

Black pine

Front – chopsticks indicate root spread

Black pine

Side

The same topic came up during my visit to Mr. Iwakiri’s garden in Japan last year – see “A seedling-cutting with too many roots” for details.

Tagged with: , ,

Repotting young cork bark black pines

Posted in Bonsai Development by Jonas Dupuich on March 3, 2015

Repotting recently grafted young pines is just like repotting non-grafted pines, only additional care is taken to avoid damaging the union.

Repotting corkbark black pine

Grafted cork bark black pine

Repotting corkbark black pine

After removing the pot

Note the white spot – there are signs of root adelgid infestation. For those curious to see how mycorrhiza differs in appearance from adelgid infestation, see below.

Mycorrhiza

Mycorrhiza – and lots of it

Simply coming out the roots cleared away most of the affected area so I didn’t spray pesticides to address the adelgids.

Repotting corkbark black pine

After combing out the roots

I planted the pine in a colander.

Repotting corkbark black pine

Nestling the tree onto a mound of soil.

Once the tree was in place, I tied it in and added more soil. Using chopsticks, I worked the new soil in between the roots.

Repotting corkbark black pine

Before chopstick work

Repotting corkbark black pine

After chopstick work – notice the level of the soil has dropped

I then added soil to fill the pot and tamped it into place.

Repotting corkbark black pine

Repotting complete

 

Follow

Get every new post delivered to your Inbox.

Join 5,089 other followers