postgrafting

Postgrafting refers to the period following a grafting procedure in horticulture, during which the graft union must heal and vascular continuity must be established between the rootstock and the scion. The process depends on species, grafting method, and environmental conditions and is a critical influence on graft success.

During postgrafting, wounded tissues respond with callus formation and gradual alignment of cambium along the union. The cambial layers must connect to allow the flow of water and nutrients from rootstock to scion. Healing typically takes several weeks to months, varying by species, age of plant material, and care. Proper establishment of the graft union is assessed by persistent growth from the graft or the emergence of a strong, continuous stem above the union.

Several factors affect postgrafting success. Genetic compatibility between stock and scion is essential. Environmental conditions such as temperature, humidity, and light influence healing; too much or too little moisture can impede healing. Mechanical stability is important to prevent movement at the graft site, which can disrupt cambial contact. Pest and disease pressure, wind, and sun exposure can also affect outcome.

Common postgrafting practices include securing the graft with tape, cord, or wax to minimize desiccation and movement while allowing gas exchange, and maintaining appropriate watering and shelter from extreme conditions. As healing progresses, supports are gradually removed, and pruning may be used to direct growth toward a productive union.

Signs of success include ongoing growth from the graft and a solid, continuous union. Failure may present as wilting, dieback at the graft, or disconnection between stock and scion.