Bonsai-Seed:
American sweetgum

When propagating bonsai, the great advantage lies in the ability to influence the shape and form of the tree from the very beginning. While it takes longer to grow a tree from seed, this method allows you to put your personal touch on both the size and design early on. By using shallow bonsai pots, the plant develops a more compact growth than wild saplings found in nature.

Introduction
The American Sweetgum is highly valued for its well-proportioned form and beautiful leaves, which resemble those of a maple. It is the epitome of the "Indian Summer," adorning itself in autumn with orange, red, and dark purple foliage. A member of the witch-hazel family, it is deciduous in winter. For bonsai, it is suitable for almost all styles except the literati form.

Propagation
The seeds are cold germinators and require stratification. Place the seeds in the refrigerator or in a tray with sand in a frosty spot for several weeks before sowing. Afterwards, scatter the seeds on moist sowing medium, cover thinly, and allow them to germinate in a cool place. Garden soil mixed with 1/4 sand is also suitable.

Location and Light
Even young plants require a sunny or semi-shaded location. They should stand somewhat freely to be fully appreciated. The Sweetgum is fully hardy, though bonsai in shallow pots should be protected from extreme root frost.

Watering and Nutrients
During the growing season, water the tree regularly, ideally every 2 days, while in winter, watering should be very sparse. From May to the end of August, fertilise every 2-3 weeks with either solid organic or liquid bonsai fertiliser.

Growing Medium
Fertile and deep soil is suitable; loose sandy soil is not recommended. Commercial bonsai soil is also perfect for healthy growth.

Pruning
New shoots can be pruned back immediately during the growing season to maintain the desired shape and promote fine branching.

Winter Storage
Although the tree is hardy, the roots in a shallow pot are more vulnerable. Protect the pot during severe frost. A bright and cool location is ideal.

Important Growing Tips
Use professional seed-starting soil or coconut coir for sowing, as these media provide good aeration and have low nutrient content. Keep the medium evenly moist during germination – not wet. Cover the tray with clear film or glass and ventilate every three days to prevent mould. Limit direct sunlight for the first six weeks after germination. After 5–8 weeks, the seedling can be carefully transplanted. Take care not to damage the delicate new roots.