Silviculture is the practice of controlling the establishment, growth, composition, health and quality of forests — meeting diverse needs and values through carefully timed interventions. Plantation Silviculture aims to develop techniques that support sustainable plantation forest management, grounded in ecological and physiological knowledge.
Four pillars of silviculture
Every plantation depends on the right intervention at the right moment in the forest’s life cycle.
Research grounded in tree biology, applied at plantation scale.
The unit’s research is grounded in the ecological and physiological understanding of tree growth and forest development over time. Activities encompass all stages of tree and forest growth and evaluate the impact of management strategies on forest outputs.
Research outputs support national forestry policy development and offer guidance to forest sector players, nurseries, seed producers, academic institutions and research bodies.
Five guidance audiences
- National policymakers
- Forest sector players
- Nurseries
- Seed producers
- Academic & research bodies
Four active research streams
From soils to canopy — the studies that shape our silvicultural prescriptions.
Weeding Studies
Quantifying the effect of weed competition on early growth — and identifying the most effective treatments by site.
Nutrition Studies
Understanding nutrient availability, fertiliser response and how soil chemistry shapes plantation productivity.
Land Preparation Studies
Comparing land-prep techniques (ploughing, ripping, mounding) and their long-term influence on tree establishment.
Correlated Curve Trend Trials
Long-term CCT trials separating the effects of competition, age and site on growth — the gold standard for plantation modelling.
What our research has delivered
Three foundational outputs that now underpin commercial plantation management across Zimbabwe.
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Spacing, thinning & pruning prescriptions Established for different commercial species and tailored to specific end products.
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Yield models & tables Developed for most traditionally grown exotic species in Zimbabwe — the basis for rotation and harvest planning.
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Site indexing Conducted for exotic species across all silvicultural zones in Zimbabwe — matching species to site for optimum growth.
Common silvicultural operations
The everyday interventions that keep a young stand on a productive trajectory.
Slashing
Cutting unwanted vegetation and competition near young trees.
Spraying
Targeted herbicide application to control weed competition.
Pruning
Removing lower branches to improve timber quality and reduce fire risk.
Weeding
Manual or mechanical removal of competing vegetation around trees.
Current Research Priorities
Three strategic focus areas guiding the unit’s work into the next phase — matching species to site and pushing into new commercial species.
Site × Species Matching
Ensuring each plantation species is established where its growth potential is highest.
Site Classification
Refining the national classification of plantation sites for precision silviculture.
Silviculture for Acacia mearnsii
Developing tailored management techniques for the black wattle in Zimbabwean conditions.