Scope: outdoor watering and irrigation delivery hardware for home/garden — garden hoses, soaker hoses, sprinklers, drip irrigation kits (emitters/tubing/filters), irrigation controllers/timers, and rain barrels; excludes hand tools, planters, and carts (sibling leaves).

Seed:
1. Watering-irrigation equivalent of olive oil's harvest date: pressure-compensating vs basic drip emitters — PC status rarely sits in a retail title/field but decides whether flow stays accurate on slopes/long rows; worth researched+low-cost backfill via brand catalog number, like harvest date.
2. A textile conservator would notice first that a product's material (vinyl/PVC vs rubber vs polyurethane for hoses, polyethylene for drip tubing) decides how it ages — UV/plasticizer breakdown, cold-weather stiffening, kink memory — before any buyer thinks about it.

Sources:
[wikipedia_garden_hose] https://en.wikipedia.org/wiki/Garden_hose — GHT/BSP thread standards, PVC lead/phthalate leaching risk — fetched excerpt
[wikipedia_drip_irrigation] https://en.wikipedia.org/wiki/Drip_irrigation — components, pressure-compensating emitters, drip tape, subsurface drip — fetched excerpt
[wikipedia_irrigation_sprinkler] https://en.wikipedia.org/wiki/Irrigation_sprinkler — oscillating/impact/rotor/raingun types — fetched excerpt
[wikipedia_rain_barrel] https://en.wikipedia.org/wiki/Rain_barrel — 55-US-gal standard barrel, mosquito screening — fetched excerpt
[epa_watersense_controllers] https://www.epa.gov/watersense/irrigation-controllers — weather-based vs soil-moisture-based certification, 15,000 gal/yr savings — fetched excerpt
[dripworks_guide] https://www.dripworks.com/content/drip-planning-guide.pdf — GPH by soil type (0.5 clay, 0.5-1 loam, 1-2 sand), PC vs basic emitters, mainline/branch tubing — fetched PDF text
[savingwater_tips] http://www.savingwater.org/wp-content/uploads/tips-for-installing-drip-irrigation-at-home.pdf — backflow preventer required by law, pressure regulator, 0.6 GPH residential default, zoning — fetched PDF text
[savingwater_soaker] http://www.savingwater.org/wp-content/uploads/Soaker-Hoses.pdf — 100 ft max run, 10-12 psi regulator, soil-based spacing, level-ground limit — fetched PDF text
[bobvila_soaker] https://www.bobvila.com/articles/best-soaker-hose/ — round vs flat form, 1/2-5/8in diameter, lead-free fittings, lateral spread — fetched excerpt
[bobvila_hose] https://www.bobvila.com/articles/best-garden-hose/ — materials, 5/8in diameter, burst psi, 55psi test standard, kink resistance — fetched excerpt
[bobvila_sprinkler] https://www.bobvila.com/articles/best-lawn-sprinklers/ — type/material/coverage sqft table, smart multi-zone app control, hose diameter vs gallons delivered — fetched excerpt
[bobvila_rainbarrel] https://www.bobvila.com/articles/best-rain-barrels/ — 35-55 gal capacity range, mesh screen, brass spigot, diverter — fetched excerpt

Branches:
- product_type -> garden_hose: "garden hoses are typically made of extruded synthetic rubber or soft plastic" (wikipedia_garden_hose) routes to hose_diameter/hose_material.
- product_type -> drip_irrigation_kit: "Components used in drip irrigation include... water filters... emitting devices" (wikipedia_drip_irrigation) routes to emitter_flow_rate/pressure_compensation/filtration.
- control_method -> smart_app_controlled: "codes require that you connect it to a permanent, dedicated line with an approved backflow prevention device" (savingwater_tips) pulls in backflow_prevention.

Noise (spec-sheet rows left out):
- Hose/sprinkler length in feet — real buying spec but reads the same as any container's "size," not an expertise differentiator; left out.
- Watering cans and wands — present in this vertical but no catalog sibling exists; left out of the facet set as a thin, low-differentiation accessory (material/capacity only), not assigned as a product_type value.
- Hose weight, color, decorative finish on rain barrels — cosmetic, not expertise.
- "Number of nozzles/jets" on oscillating sprinklers (Bob Vila: 14 vs 20 jet nozzles) — correlates with coverage_area already captured; not a separate facet.

Corrections (2026-10-26):
- emitter_pressure_compensation.source changed listing -> researched; listing_field_hint/backfill_note rewritten to the Seed's own catalog-number backfill insight instead of a title keyword-match.
- controller_automation_type.source changed listing -> researched, matching its own listing_field_hint (an external WaterSense-list lookup, not a listing field).
- rain_barrel_capacity.range.max fixed 65 -> 55 gal; no cited source reached 65 (bobvila_rainbarrel table tops at 55, wikipedia_rain_barrel's standard is 55 US gal).
- sprinkler_coverage_area.range.min fixed 30 -> 575 sq ft, the lowest tested coverage actually stated on bobvila_sprinkler ("Dramm 9-Pattern Turret Sprinkler... Up to 575 square feet"); 30 was a diameter figure, not an area.
- soaker_hose_max_run_length.range dropped the unsupported min:50 floor; savingwater_soaker only sources a 100ft ceiling, so the facet is now a single sourced maximum.
- control_method split: added a timer_controlled branch (then_ask: controller_automation_type), which previously had no branch despite controller_automation_type's fixed_clock_timer value existing for exactly this case.
- product_type split, drip_irrigation_kit branch: added backflow_prevention to then_ask so a hand-watered drip kit is asked it too — savingwater_tips requires backflow prevention on a connected drip setup "whether you manually or automatically control" it, not only behind smart_app_controlled.
- Added facet drip_delivery_form (point_emitter_dripper / micro_spray_mini_sprinkler / drip_tape), sourced to dripworks_guide (misters/micro-sprayers/mini-sprinklers/drip tapes as distinct product forms, tape covering 200-4000ft per kit) and wikipedia_drip_irrigation (emitter/dripper, micro spray head, drip tape as distinct emitting-device types); added to drip_irrigation_kit's then_ask. Added vocabulary entries "Drip tape" (retargeted to this facet) and "Micro-spray head".
- sprinkler_type.cold_start_question rewritten to include traveling_raingun, which the facet's own values list already had but the question omitted.
- Added an "NSF" vocabulary entry (drinking_water_safety_cert) per the checker's Part E finding.
- Rejected in part: did not name a specific ASSE device-standard number for backflow_prevention or an NSF/ANSI standard number for drinking_water_safety_cert. Fetched wikipedia_garden_hose, the Vacuum breaker and Backflow prevention device Wikipedia articles, and IAPMO's standards page; none named a specific standard number in the fetched text, and NSF.org and several extension/plumbing sources were blocked or 403/404. Per the no-invented-numbers rule, left the "required by law"/"NSF-listed" phrasing as-is rather than cite an unverified standard number.