Why Do I Repot a Big Ficus From a Ceramic Pot into a Wooden Box?

This Ficus microcarpa was potted into a 24″ round ceramic pot in 2015. By 2018, it needed repotting again but I procrastinated and did not do it in 2019 either. I finally repotted it a few days ago, but into a wooden box.  I jokingly said it was because I needed to reduce the overall weight. That is true but there are more important horticultural reasons repotting it into a wooden box, like rejuvenating the roots, regaining the tree’s health, and working on the overgrown aerial roots and nebari.

Potted into a 24″ round ceramic pot, May 2015.

July, 2018. Ready for a repot but did not do it.

Why Use a Wooden Box?

To restore a bonsai’s health, it is a good idea to repot the tree into a slightly larger container, preferably in a terra cotta pot, a wooden box or a Styrofoam box.  A slightly larger container provides more soil volume and extra rooms for the roots to rejuvenate, increased surface areas between soil aggregates also allow the roots to breath better and grow more fibrous roots.  A cedar picket fence wooden box is an obvious choice since I cannot find a larger terra cotta pot or a big Styrofoam box. Although the latter can protect the roots from over heating during our intense summer heat, it is too glaring and stands out too much among the other trees, unless I could paint it.

As for weight, the 24″ ceramic pot weighed 32 lb., a comparable wooden box weighed about 5 lb.  I made a rough calculation, this round pot with tapered wall has a volume of about 1,100 cubic inches (about 18 L.), a square box holds almost twice the amount of soil.  Your tree will thank you for the extra room while in recovery.

Reworking Overgrown or Thickened roots

Aerial roots are great for improving the tree’s nebari, but they can become too big, crisscrossed or grew in unintended direction if one is not diligent in controlling and incorporating them to the intended design.

These two photos show how the skinny grafted aerial roots grew in 4 years without repotting in between:

Grafted aerial roots A, B and C in 2015 and 2019. Branch D was removed as it was sticking too much towards the front.

These grafted roots needed repositioning and incorporating into the nebari:

Repositioning thicker roots using aluminum wires and tourniquet.

Crossed roots repositioned, once fused, the top sections will be cut off.

Exposing More of the Nebari

Every time I repotted, I raised and exposed the nebari by about 1/2”. This time I raised it by about an inch. Exposing it gave the tree a larger nebari in each repot.

Root base raised by about an inch, shown by differences in tree bark colors.

Another advantage of using a wooden box is I could easily put in a few screws on the box to attach guy wires to bring down branches.

E.J.H Corner, a Ficus Authority and “My Father in His Suitcase”

I was searching online for ficus information, came across “FigWeb” and saw this reference:

Berg, C.C. & Corner, E.J.H. 2005. Moraceae – Ficus. Flora Malesiana Series I (Seed Plants) Volume 17/Part 2. National Herbarium of the Netherlands, Leiden.

Holy Moly! Was Corner still alive in 2005?  No, he passed in 1996.  The monograph was published posthumously.

As a ficus bonsai enthusiast, I think there are two botanists whose names are worth knowing beside Carolus Linnaeus the Younger who first described our ubiquitous Ficus microcarpa. These two botanists are:

C.C. Berg: He was the one who clarified the scientific name of Willow Leaf aka Narrow Leaf Ficus, described it in a paper with a very interesting title: “A New Species of Ficus (Moraceae) of Uncertain Provenance”. His description was based on container plants (bonsai, pre-bonsai??) from Florida, which became the type specimens. So Willow Leaf Ficus’ scientific name is officially Ficus salicaria; and salicaria means willow-like in Latin, a round about way of calling it a willow-like ficus. Many people still use the names F. nerifolia, F. salicifolia, but they are different species, not the one we grow in bonsai.

Cornelius (Kees) Christiaan Berg 1934-2012

My Ficus salicaria CC Berg shohin bonsai.

Two “Root-On-Wall” Ficus Penjing – How I Create This New Style

This article was written by Mr. Xuenian Han (韩学年), a well-known Lingnan penjing master. It was published in Mr. Shaohong Liu’s (刘少红) “The World of Penjing” (盆景世界), the most widely read online penjing magazine in China with over 135,000 subscribed readers. Both Mr. Han and Mr. Liu gave me permissions to translate this article and share it with English readers on how this new style was developed.

“The Fittest”, a “root-on-wall” ficus created by Mr. Xuenian Han. 韩学年作品《适者》（附壁榕）

Ficus microcarpa is a native tree species in the Lingnan region. As a fast growing tree and an ability to grow in a broad range of habitats, it is widely cultivated in urban and rural areas. In the Pearl River Delta, especially in villages and towns along the river, banyan trees with broad canopies provide shades and are popular with villagers, where they could gather and cool themselves during the hot summer days.

Ficus has large, powerful tree trunk and wide spreading, old gnarly roots. Since Lingnan penjing practitioners often model their trees based on close-range observations of how trees grow in nature, thus, the Banyan style was born. Ficus is a popular species for Lingnan penjing, whether the material is field grown or collected, key banyan features are artistically recreated and portrayed in a grow pot. There are many excellent examples of banyan style penjing.

Ficus growing on the old Nanfeng kiln wall in Foshan city, Guangdong. 佛山市“南风古灶”古榕

Ficus have aerial roots, when these roots touch and anchor themselves onto the ground the tree would continue to grow outwards, creating a forest-like image even though it is just a single tree; and this is the familiar banyan image.  Since ficus is a strong survivor and adapts to myriads of environments, there is another tree form from which these two “root-on-wall” penjing were based upon, and I will discuss how I created them.

An old ficus growing along a river in Shunde, Guandong. 本地（顺德）一河边古榕