This article from NBF officer and board member Ross Campbell first appeared in the March 2025 edition of Snippets, the Brookside Bonsai Society’s newsletter.
We were foiled by unusually cold temperatures in February and thus discouraged from starting our repotting checklist. But now the weather has warmed into the 60s, and our trees are beginning to respond. The forecasts look promising for the next week or so, meaning that it should be safe to repot. Keep in mind that newly repotted trees still need to be protected from a sudden freeze.
At the National Bonsai and Penjing Museum, many of the trees are wintered in the Chinese Pavilion. The Pavilion is somewhat warmer than ambient temperatures because of the glass panels in the roof and the walls and doors. As a result, trees begin to break dormancy in the Pavilion a little earlier than they would otherwise. A recent stroll past the benches found several trees with buds that are starting to swell.
Parsley Hawthorn (Crataegus marshallii)
The buds on this Parsley Hawthorn are gratifying to see. Proof that Spring is close at hand. This native of the Southeastern U.S. was named in honor of botanist Humphry Marshall (1722-1801), an American botanist. (Not after Elvis Parsley, as you may have thought.) Marshall is known as the “father of American dendrology.”
Chinese Quince (Pseudocydonia sinensis)
This Chinese quince is far ahead of the hawthorn, with some leaves fully open and flowers soon to follow. One of the original 1976 Bicentennial gifts to the nation from Japan, this quince has been in training since 1875. That means that the tree is celebrating its “Sesquincentennial” this year. ;)
Drummond Maple (Acer rubrum drummondii)
If you look closely, you can see not only the buds at the tips of this Drummond Maple’s branches, but also along the branches. It appears that pruning has triggered interior buds, a very welcome development.
Chinese Elm (Ulmus parvifolia)
On the other hand, this Chinese Elm forest is still in the depths of winter dormancy, at least to all outward appearances. Perhaps it is convenient that different species wake up at different times; that way we can schedule deciduous bonsai repotting in a sequential manner, starting with those that are showing bud swelling.