As the first hints of autumn settle, the bonsai garden begins its quiet transformation. The light softens, the air soon cools – although right now we have warm, pleasant summer temperatures, and the trees respond with subtle shifts in colour and energy. This is a season of preparation—not only for the trees but for the bonsai enthusiast as well.
Here are some essential steps to take care of your bonsai collection as we enter early autumn:
1. Observe the Seasonal Signals
Early autumn is a transitional phase. Deciduous bonsai like maple, elm, and hornbeam may begin to show the first signs of colour change. Growth slows, and the trees start storing energy for winter. This is a good time to reduce feeding and observe each tree’s response to the changing light and temperature.
2. Adjust Watering Practices
When temperatures changes, coming cooler temperatures and shorter days, your bonsai will require less water. Overwatering becomes a risk, especially for species that are slowing down. Check the soil moisture carefully—water only when the top layer feels dry. Morning watering is ideal to avoid damp conditions overnight.
3. Reduce Fertilization
If you’ve been feeding your bonsai regularly through summer, now is the time to taper off. Switch to a low-nitrogen fertilizer if needed, especially for deciduous trees. This helps harden the growth and prepare the tree for dormancy without encouraging soft, vulnerable shoots.
4. Clean and Prepare for Leaf Drop
As leaves begin to fall, keep the soil surface clean to prevent fungal issues. Fallen leaves can trap moisture and invite disease. This is also a good time to inspect your trees for pests or signs of stress before winter sets in.
5. Plan for Winter Protection
Start thinking about your overwintering strategy. In Northern Europe, many bonsai species will need shelter from frost and wind. Cold frames, unheated greenhouses, or sheltered outdoor spots with mulch can help protect roots from freezing. Tropical and subtropical bonsai should be moved indoors before night temperatures drop too low.
6. Enjoy the Beauty of Change
Autumn is a poetic season for bonsai. The changing colours, the crisp air, and the slowing pace invite reflection. Photograph your trees as they transition—capture the textures, the tones, and the quiet elegance of this time. These moments are fleeting, and they tell a story worth preserving.
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