How to Choose the Right Container Size and Compost for Large Outdoor Plants?

Choosing the appropriate container size for large outdoor plants or trees is essential for their healthy growth. For a single large plant or two to three smaller, younger ones, a container that’s at least 12 inches in diameter and eight to 12 inches deep is recommended. To enhance drainage and stability, especially in windy conditions, placing 2-3 inches of rocks or gravel at the base of the container is advised.

When it comes to large plants, such as trees, the container size should be proportional to the trunk diameter. For every centimetre of trunk diameter, the container should be 30cm wider and taller. This ensures adequate space for root growth and plant stability. For specific plant types like bamboo, ensure they are planted slightly lower than their original pot level. Acid-loving trees, like Amelanchier, thrive in loam-based John Innes Ericaceous compost.

The general rule for repotting plants is to move them to the next pot size up. This gradual increase in pot size helps in better root development and overall plant health. Most trees benefit from a loam-based compost, such as John Innes No 3, which provides both nutrients and stability.

When considering large planters, it’s crucial to ensure the drainage holes are not obstructed. The range of planters available includes various materials and designs, catering to different aesthetic and functional needs. For example, options include sturdy wooden planters, elegant metal planters with a brass finish, and practical plastic planters.

Planning a display for a large container requires careful consideration of plant types and their growth requirements. For instance, planting potatoes in a large 40 litre pot can yield a substantial harvest. Monty Don, in a Gardeners’ World programme clip, provides insights into planning a display for large containers.

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Large Outdoor Plant Pot

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