Source: https://guthlabs.ai/docs/instruments/garden-plant-spacing-planner/implementation/

instrument implementation / implementation-contract

# Garden Plant Spacing Planner implementation

A source-bound implementation contract for Garden Plant Spacing Planner; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-269

**Effect**: Computation or source lookup only

## Input and validation requirements

The offset-pattern rule specifies only approximately 15% greater density and does not define the triangular-packing geometry, integer rounding, or edge handling. For a grid count of 24, it produces 27.6 before rounding, so the exact required plant count is not uniquely determined. Zero spacing also yields undefined division and must be rejected.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "bed_length": 3,
    "bed_width": 2,
    "spacing": 0.5,
    "row_spacing": 0.5,
    "unit": "m",
    "layout_pattern": "grid"
  },
  "expected_outputs": {
    "plants_per_row": 7,
    "rows": 5,
    "total": 35,
    "layout_diagram": "7 columns x 5 rows"
  },
  "working": "plants_per_row = floor(3 / 0.5) + 1 = floor(6) + 1 = 6 + 1 = 7; rows = floor(2 / 0.5) + 1 = floor(4) + 1 = 4 + 1 = 5; total = 7 x 5 = 35."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/garden-plant-spacing-planner/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/garden-plant-spacing-planner/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/garden-plant-spacing-planner/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`