Develop great nebari #2

Here’s one way of starting a good lateral root system. It works particularly well with trident maples but I have also used it on Japanese maples successfully and it should work well with any species that layers easily.

I tried it once with 5 Japanese Black pines. Only 2 of them survived so I have not used it again with pines but maybe it could be modified to work better.

Start with a piece of sheet metal. I’ve tried stainless steel which is very hard to drill holes in. Now I’m using aluminium sheet – easy to cut and easy to drill but also strong and durable. I’ve used these same pieces over and over for more than 10 years now. As you can see from the pics mine have been cut from old roadsigns I got from the scrap metal yard.

Cut pieces around 7-10cm square. Circles would be even better but are harder to cut.

Drill holes in each piece. Size of the holes is not critical but they do need to be big enough to thread your starter plants through. Holes in my sheets are 6mm diameter.

Thread a seedling through the hole. This is obviously far easier in winter when the seedling is dormant.

Plant your tree with its new metal collar just under the surface. As the trunk thickens the metal will constrict the flow of nutrients causing new roots to form just above the plate. These new roots will be forced to grow horizontally over the metal plate until they reach the edges giving a horizontal root system.

Don’t bury your plate too deep. Tridents have a very strong tendency to put out new roots right at the surface and if you give them the opportunity you will end up with more roots above your new nebari. Those higher roots can quickly produce inverse taper and ruin your good work.

I usually keep my new threaded seedlings in pots in the nursery for the first summer. There is a critical period, usually in mid summer, when the trunk is constricted so water flow is reduced but the new roots are still growing out across the plate and do not have access to deeper, damp soil. At this stage your plant needs to have regular water to keep the surface soil moist where those new roots are developing. The trident maples shown here after just 1 year in a poly box in the nursery and have more than doubled in thickness. Roots should be growing out across the plates that each one is threaded through.

The following winter the plants should be bare rooted to check on progress and adjust as required. At this stage I prune all new lateral roots back to the edge of the plate to force them to further ramify. If you have a few stronger roots cut those even shorter to encourage the weaker ones. I also prune the trunks short at this time. Pruning results in several new leaders which gives the best chances for developing good taper and changes of direction in your developing trunk.

At this stage I usually plant the starters into the ground grow beds where they will grow faster for another year but if you don’t have access to ground growing area use a large pot. Again, be careful not to plant too deep. Roots should be around 1 cm below the surface for best results.

These trees have been in the grow beds for one year.

You may have noted that I try to plant the seedlings through the plates at an angle. Unless you are aiming for a formal upright or broom style bonsai, vertical trunks are not very interesting so try to give your starters a bit of trunk movement right from the roots.

 

No method is 100% successful. Occasionally one or 2 roots grow very strong and suppress the others. Good pruning at year 1 can minimise this.

 

This technique can also be used to develop multi trunk style bonsai. Just drill any number of holes in your metal sheet and thread a seedling through each hole. Not only will roots grow as the seedlings thicken but they will also fuse together into a single multi trunked tree.

 

Twin trunks.

 

 

 

 

 

or many trunks.

As the trees develop you may need to wire some of the trunks to get a unified arrangement or even remove some completely to leave a better shaped tree.

 

Trident nebari

Spreading basal roots, known by the Japanese term ‘nebari’ is considered very important for maple bonsai. Surface roots are prominent features of old maples, pines and elms so these features are also valued in bonsai of these species.

Nebari should, ideally, spread evenly all around the base of the tree, showing enough to give the tree the air of age and stability. Continue reading

Chojubai – Dwarf Japanese Quince

The autumn colours are gone and winter is usually pretty drab in the bonsai garden unless you have flowering Japanese Quince. Also known as Chaenomeles, most of the garden varieties flower later in winter, before the leaves sprout but this variety, called ‘Chojubai’ has occasional flowers all year round and a more concentrated display right through winter.

Chojubai flowers

The brilliant orange flowers are small which is an advantage for bonsai.

 

 

 

 

 

Continue reading

Start a bonsai forest

The trident maples in the garden at Shibui Bonsai produce huge quantities of seed each year. This results in lots of seedlings growing in the garden beds. We usually leave a few hundred to grow on for use as bonsai.

You can germinate your own seedlings under controlled conditions but I find it far easier to let nature do that for me and I just harvest the seedlings I need from our garden beds.

Today I used some to put a trident group together. It will take a few year for this group to develop into show quality bonsai but groups are one of the quickest ways to get good results from immature material. Continue reading

Bonsai Week

I was fortunate to get a place with Tony Tickel at this year’s Bonsai week workshops. Thanks to the National Bonsai and Penjing Collection of Australia for making these bonsai activities possible. I think everyone who attended took home a lot of new information and ideas.

I finally decided to take an old black pine. I’ve had a couple of these trees since they were small seedlings but because I did not understand pine maintenance techniques properly they both gradually grew long, bare branches with foliage only at the tips. The trunks are thick and have mature bark which is highly desirable in pines. This one also has a large, spreading root mass so I thought it was worth taking some time and effort to try to resurrect it for bonsai.

I have spent the last 7 years forcing the foliage closer to the trunk to make the trees more compact. Pruning stimulated a few back buds on bare wood which were then nurtured until strong enough to remove the longer branches. I also resorted to grafting and inarching to get growth on other branches that had refused to bud.

Here is the tree before the workshop.

Black pine before

You can see that there was plenty of branches and foliage to choose from. The tree was well fed and healthy to cope with a major restyle.

black pine nebari

 

 

 

 

After checking several options we decided to try to keep the current front because the nebari on this side is far better than the other side.

 

 

 

 

After

There were several options for trunk lines and we have used a fairly standard informal upright trunk line with some jin and shari.

 

The first branch had a really nice shape but was far too heavy for the remainder of the tree so it was removed leaving a short jin.

The apex of the tree leaned too far forward and was an awkward shape so it was also jinned. Because the old main trunk was so strong it had thickened the trunk in that area giving a slight reverse taper to the new trunk so a small area of shari surrounds the jin to reduce the visual weight and maintain better visual taper.

 

After the worshop

Spring should see this pine grow strongly. I’ll begin my pine maintenance schedule with this one now to try to maintain density and promote inner buds – Early summer candle pruning and needle plucking followed by autumn thinning and more needle plucking should produce more even energy distribution and promote shorter growth and smaller needles.

 

shibuibonsai.com.au has moved

We recently moved shibuibonsai.com.au to a new server. It appears that not all the images I have used in the posts have survived the move. It will take me some time to replace the missing files. In the meanwhile you will just have to use your imaginations to fill out the visual details of some of the posts. Please let me know if you have found a post that is vital to you and desperately needs the images to make sense and I’ll see if I can fast track replacing those files.

Apologies for the inconvenience and thanks for your patience.

Neil