pot out

To pot out is to remove a young plant from its nursery pot and plant it directly into garden soil or a larger container. This is a critical step in propagation and field establishment, usually performed when the plant has developed enough root mass and leaf area to survive transplanting shock, typically 4 to 8 weeks after germination depending on species.

The timing of potting out depends on the crop and growing conditions. Seedlings are potted out once they have developed their first true leaves and a visible root system, not merely the cotyledons. For vegetables like tomatoes, peppers, and brassicas, this occurs at the two to four true-leaf stage. The plant's cell wall has hardened sufficiently by this point to withstand handling and the stress of soil contact. Early potting out risks root damage and disease; delayed potting out causes root-bound seedlings that never fully recover.

The operation itself involves gentle extraction of the plant and its root ball from the nursery pot, which is done by inverting the pot, supporting the stem between two fingers, and tapping the base. The plant is then placed into a prepared hole at the same depth it occupied in the pot, with the soil firmed around it and watered immediately. Depth matters: planting too deep can promote stem rot, while planting too shallow exposes roots.

Variants and conditions

Large-scale vegetable and ornamental producers pot out seedlings into individual cells or modules in plug trays before final field planting, a practice sometimes called "potting on" when moving to larger containers first. Direct potting out into field soil is common in smaller operations and for crops where transplant shock tolerance is high. Hardening off, the gradual acclimation to outdoor conditions over 7 to 10 days before potting out, significantly improves survival rates and vigor.

The term sits within a family of potting operations: potting up (moving to a larger pot), potting on (moving to an even larger pot), and potting out (final placement in garden or field). Confusion arises because regional usage varies; in some British contexts, potting out can mean the first potting into individual containers. The name reflects the movement from pot to the open ground, where the young plant must establish in uncontrolled conditions.