A good nebari (exposed roots just above the soil surface) and a large trunk base are perhaps the two most desirable features we all wanted for our bonsai. However, they take a long time to develop. Many of us buy pre-bonsai. At the nursery, we may dig below the soil level, hold the tree up, turn it around and tilt it at various angles to choose the best possible material but it is rare to find one with both a good nebari and a large trunk.
In this post, I want to share my experience building a good nebari, at least to my eyes, and a large tapered trunk for a Ficus microcarpa pre-bonsai. I bought this ficus about 9 years ago from a gift shop of a local Chinese restaurant. As in all mass-produced pre-bonsai, they usually have messy or unattractive roots and a typical S-shape trunk. What attracted me to this tree was the large trunk base, however, it has a nagging thick root, about 2″ diameter, growing on the convex side of the trunk’s first curve, and plunging down into the soil like a large inverted J-hook. Nevertheless it was a good starting material.
When we begin to train our tree with a faulty root such as this one, uneven trunk movement or branch placement, it is imperative that we correct them as early as possible. If not, they will stay with the tree and may beome more troublesome to correct at a later date. We have to decide how we want our bonsai to look like in 5, 10 or more years down the line. There is no short cut unless you want to spend big bucks buying a “specimen” tree from bonsai professionals.
This is how this ficus looked in July this year after defoliation and wiring. The root spread is about 10″ at the soil level and the trunk diameter is about 4½” above the root base.