I found a store which had small colanders in stock, so I ended up purchasing twelve of them in preparation for repotting this Spring. Now is the time to put these colanders into good use. I had some Japanese Quince cuttings growing in a pot along with a few Shimpaku Junipers cuttings for two years now. Since they’ve survived two winters, I’m pretty sure they have some roots and are viable. Transferring them to colanders will help them further develop finer roots to support more vigorous growth.
When I pulled the plants from the pot, there was a big mass of Japanese Quince roots. It is to be expected that deciduous trees tend to put out roots more readily than conifers. The challenge was to separate out the Shimpaku cuttings from the root mass without damaging the Shimpaku roots. After an extended period of teasing and combing out roots, I was able to separate the six Quinces from the Shimpakus. I cut back the Quince roots heavily to promote more fine roots growth. I largely left the Shimpaku roots intact, with the exception of cutting short a few running roots, to try to balance the thickness of the roots (or else the running roots will significantly thicken in the expense of the other roots). All the Shimpakus fit comfortably into a single colander. Since Shimpakus roots tend to grow slowly, I’m not too concerned that they’ll be too intermingled.
I also had another Japanese Quince which seemed too over-potted into a big colander. Also, it was potted in the crappy potting medium I had last Spring which tend to breakdown quickly and saturate the pot. So I decided to repot it as well, it now looks more inline with the size of the colander.
The two years old Japanese black pine (JBP) seedlings have also started moving as their candles extend. I figured I’ll pick a few to repot into the colanders to see how they respond in comparison to the other JBPs which remained in their nursery pots. The most vigorous JBP looks to be a year or two ahead of its cohort, so I started with it first. Indeed, it had a very healthy root system, but the roots are somewhat tangled, it’s timely that I decided to repot them now, or else the roots would have gotten too thick to reshape. With some wetting of the roots, and some persuading, I was able to rearrange the roots into a radial form around the trunk. Hopefully, in a few years time, they would develop into a nice radial nebari. I saw some books that suggests tying the roots down to a rock would force the roots to grown sideways rather than down. So I decided to tie the roots to a ceramic dish, but I quickly found out that strings are really difficult to maneuver, especially around a round dish. So, I decided to use wire instead. Just one piece of wire is sufficient to hold the tree down against the dish. I just need to ensure that I cut the wires as the trunk thickens.
All in all, I repotted three JBPs. As I go from the most vigorous to the least, I began to noticed that there are substantially less roots as well. The other remaining JBPs will have to wait till next year before they’re ready to be repotted into colanders. For the second JBP onwards, I didn’t even bother with the string, and just went directly with using the wire to secure the tree to the dish. After securing the tree into the dish, then it’s just a matter of tying down the combo into the pot the old fashion way, using the cork screw method to secure it all down. I purposely left the wire ends longer, such that they can help hold down the dangling roots. These JBPs will be resting under shade for a week, before they’re reintroduced to the sun.