Growing a small plum tree in an outdoor plant box is entirely possible, provided you follow the right steps to ensure its health and productivity. Container gardening offers flexibility, especially for those with limited space, but it requires careful attention to the tree's needs.

First, choose a sturdy, spacious plant box—preferably at least 18-24 inches deep and wide—to accommodate the plum tree's root system. Ensure the box has proper drainage holes to prevent waterlogging, which can harm the roots.

Use high-quality, well-draining soil mixed with organic compost to provide essential nutrients. Plum trees thrive in full sunlight, so place the plant box in a spot that receives at least 6-8 hours of direct sunlight daily.

Regular watering is crucial, especially during dry spells, but avoid overwatering. Fertilize the tree during the growing season with a balanced fertilizer to support fruit production. Prune annually to maintain shape and encourage healthy growth.

With proper care, your small plum tree can flourish in an outdoor plant box, yielding delicious fruit even in compact spaces. Container gardening opens up new possibilities for urban and small-space gardeners to enjoy homegrown plums.