Typical single-post system
*Final dimensions and footing must match soil, wind, material, canopy load, and local engineering practice.
Guide 03 / Field planningBuild once.
Build once.
Harvest for years.
Wet roots and weak supports are expensive mistakes. Treat drainage, access, irrigation, and trellis load as infrastructure.
Design from constraintsMap water movement, wind, roads, turning space, utilities, cultivar blocks, harvest access, and expansion before fixing post locations.
01 / Orchard architecture
Support the cropDrain below.
Drain below.
Carry above.
Spacing must balance equipment, air movement, canopy access, land use, and support loading. Local engineering requirements take precedence over examples.
Drain fast
Use raised beds or mounds where needed. Avoid low points and compacted root zones. Organic matter cannot rescue chronic saturation.
Hold the load
Mature wet canopies create high static and wind load. Use durable, non-abrasive crown supports and inspect posts every season.
Open the canopy
Train selected leaders upward, then retain productive hanging stems. Remove congested, damaged, ground-touching, and diseased growth.
Read water and wind
Observe the site after heavy rain. Check flood history, frost pockets, salt exposure, wind corridors, shading, and reliable all-season access.
Test before amending
Sample representative zones for pH, salinity, texture, organic matter, and nutrient status. Test irrigation water as part of the same system.
Design for people
Allow safe pruning, pollination, harvest, scouting, bins, machinery turns, drains, and repair access at mature canopy size.
Field calculator
Turn land area into an establishment estimate.
Results exclude roads, drains, buildings, headlands, and unusable land unless entered as field-use efficiency. Use for early planning, not procurement or engineering.
Estimated posts944
Planting material3,776
Trellised row length2,833 m
02 / Trellis engineering deep-dive
Posts, crowns, footings & longevityEngineer the load.
Engineer the load.
Defend the life.
A trellis is a fixed structure that must carry a heavy, wet, wind-exposed canopy for a decade or more. Soil, wind zone, drainage, canopy mass, and corrosion environment decide dimensions — no universal height, depth, or footing applies. Use local engineering and building rules for every final specification.
Engineering disclaimer: examples below compare options and prompts. They are not footing depths, embedment ratios, concrete mixes, rebar sizes, or wind-load calculations. A qualified local engineer or building authority must approve height above grade, footing size, and anchorage for your soil, exposure, and code.
Precast reinforced post
Heavy, durable, termite-proof, and widely used. Resists rot and many ground pests.
- Pros
- Long service if well-made and reinforced; low fire risk; holds crown hardware well.
- Cons
- Weight and transport cost; quality varies by aggregate, cure, and steel cover; can spall if poorly compacted.
- Durability
- Protect reinforcement from chloride and prolonged wetting; inspect for cracking, exposed rebar, and leaning.
Galvanized or coated steel
High strength-to-section, predictable fabrication, but corrosion and abrasion control are decisive.
- Pros
- Straight, uniform, fast install with correct footing/plate; easy to fit ring or tire crown.
- Cons
- Corrosion where coating is damaged, at ground line, or in saline air/soil; heat transfer can affect adjacent stems.
- Durability
- Specify galvanizing or duplex coating; isolate dissimilar metals; touch-up and inspect annually, especially at soil-air interface.
Treated timber
Available locally, easy to work, but treatment, species, and ground-contact suitability govern service life.
- Pros
- Lower upfront cost in some markets; easy crown attachment; lighter handling.
- Cons
- Decay, insect, splitting, and movement where treatment or installation is inadequate; variable strength.
- Durability
- Use treatment rated for ground contact in your jurisdiction; keep end-grain sealed, avoid soil piling, and plan earlier replacement.
Composite / alternatives
Engineered or recycled posts marketed for corrosion or decay resistance; evaluate structural data, not claims alone.
- Pros
- Potentially low corrosion/decay; consistent dimensions; some reuse appeal.
- Cons
- Variable stiffness, creep, UV aging, and fixing method; fewer long-life references; cost spread wide.
- Durability
- Demand load, deflection, and UV data from qualified test reports; verify crown fixing and footing compatibility.
Support the hanging canopy
Crown options include a welded steel ring, rebar tire, concrete collar, or tire-and-wire assembly. Size sets canopy radius and load arm: larger overhang increases fruiting wood but also bending moment, abrasion risk, and wind sail. Smooth, non-abrasive bearing surfaces and rounded edges reduce stem injury; protect sharp rebar ends and check tie contact points each season.
Height, embedment, and wind
Illustrative above-grade heights of about 1.5–2.0 m suit many hand-harvest systems; harvest reach, equipment clearance, and wind load may push a design lower or higher. Footing diameter, depth, concrete, drainage around the base, and any stone or collar depend on soil bearing, water table, exposure, and canopy load when wet and windy. Do not copy a neighbor's depth — obtain a site-specific footing design and drainage plan.
Raised bed, mound & drain integration
Where water ponds, place posts on a continuous raised bed or individual mound with surface fall to a collector drain. Keep the post base out of standing water; do not backfill with dispersive clays that perch water. Integrate bed, drain, and irrigation layout before marking post centers so machinery and water both keep moving at mature canopy size.
Density has a cost
Tighter row and post spacing raises post count, canopy density, early yield per hectare, and harvest labor, but narrows airflow, spraying accuracy, bin movement, and wind shedding. Wider lanes improve access, drying, and repair but use land differently. Model both geometries with the field calculator and a turning-circle sketch before fixing centers.
Broad, soft, replaceable
Use wide, UV-tolerant ties (woven tape, soft fabric, or rubber) that do not cut stems. Replace brittle or girdling ties; keep ties off the ground and away from prolonged wet contact. Record tie type and inspection date so failures can be traced to batch or exposure.
Plan replacement
Track install date, material, supplier, footing detail, crown type, and repair history per block. Budget for staged replacement rather than whole-orchard failure: corrosion, cracking, soft rot, leaning, and anchor slip are staged signals, not sudden events. Retire posts before they drop a loaded canopy.
See failure early
Inspect at install, after first heavy rain and wind, every flush, and pre-harvest when canopy weight and sail peak. Document leaning posts, cracked collars, rust bleed, exposed rebar, soft timber, loose crowns, and ponding at bases — and close each finding with a dated action.
Materials estimator
Build a trellis budget.
Currency-neutral estimator: enter local unit costs. Posts can be pulled from the field calculator or entered manually. Totals are arithmetic estimates for planning, not quotations or engineering approvals. Taxes, transport, wastage, and contingency are excluded unless you include them.
Tip: change the field calculator above to sync posts, or edit posts directly. All blank or invalid numbers are treated as zero; negative entries are clamped.
Post subtotal—
Crown subtotal—
Wire / rebar subtotal—
Concrete / footing subtotal—
Labor subtotal—
Estimated trellis total—
Per-post all-in—
Posts from calculator—
| Category | What it covers | Often missed |
|---|---|---|
| Posts | Post itself, treatment/coating, delivery to line, handling | Breakage, seconds, off-spec concrete, re-delivery |
| Crown / ring | Ring, tire, rebar, fixings, abrasion sleeves | Weld repair, sharp-edge remediation, replacement crowns |
| Wire / rebar | Cross-wire or rebar arms, clips, tensioners | Corrosion, re-tensioning, spare wire |
| Concrete / footing | Concrete, aggregate, water, formwork, compaction | Drainage, stone collar, deeper footing on soft soil |
| Labor | Setting, plumbing, footing, crown fit, cleanup | Rework, leaning correction, safety gear, supervision |
| Not in estimator | Engineering, permits, bed forming, drains, irrigation retrofit | Contingency and waste — add locally |
Estimator logic: total = posts × (post + crown + wire + concrete + labor). Per-post = sum of the five unit costs. Posts may be driven by the field calculator; manual edit unsyncs only when the sync box is unchecked.
Seasonal inspection
- Walk every row; sight down lines for leaning or settled posts
- Check crown tightness, weld cracks, tire wear, and sharp edges
- Inspect base for ponding, soil wash-out, cracking, or rust bleed
- Replace girdling or brittle ties; retrain stray stems
Storm and rain check
- Inspect after heavy rain, strong wind, or flood
- Probe soft ground around bases; clear drains and beds
- Secure leaning posts before canopy weight returns
- Log event date, gust/duration, and affected blocks
Annual engineering review
- Measure sample post plumb, height, and crown diameter
- Photograph representative posts and footings
- Test timber firmness and steel coating; note exposure
- Schedule replacements and budget carry-forward
Keep learning: compare your observations with crop care pruning rhythm, irrigation layout, and economics scenarios before fixing a final trellis specification.