Our Methodology

Every article on this site makes product recommendations that people spend real money on. That responsibility matters to us. This page explains exactly how we research and evaluate products, what “independent” means in practice, and the specific standards we hold ourselves to.

Our evaluation process

Step 1 — Market research (2-4 weeks per category)

Before we write a single product recommendation, we research the category:

Product landscape scan: We identify every credible product in the category across our four target markets (US, CA, AU, EU), including brands that may not be well-known outside specialty hydroponic channels.
SERP analysis: We audit the top-ranking content for each target keyword to understand what competitors cover, what they miss, and where the content gaps are.
Owner review aggregation: We read aggregated owner reviews on Amazon, Reddit (r/aerogarden, r/hydro, r/IndoorGarden, r/Hydroponics), hydroponic forums (AeroGardenAddicts, GrowDiaries, THC Farmer for cross-reference, Rollitup for cross-reference), and product-specific community pages. We look for recurring patterns — both positive and negative — that indicate real-world product behavior beyond the marketing claims.
Manufacturer spec verification: We cross-reference marketing claims against published specifications, data sheets, and (where available) third-party testing data.

Step 2 — Product evaluation

For each product we evaluate, we assess across five dimensions:

Dimension	What we measure	How we measure it
Performance	Does it grow food crops well at the claimed capacity?	Owner reviews, published specs, university extension cross-references
Value	Is it worth the price relative to alternatives?	Price-per-pod, cost-per-gallon, 5-year TCO calculations, $/PPFD
Ease of use	Can a beginner set it up and maintain it without frustration?	Setup time, maintenance burden, app quality, documentation quality
Reliability	Does it hold up over months of daily use?	Warranty length, owner-reported failure rates, firmware stability history
Availability	Can buyers in US, CA, AU, and EU actually purchase it?	Regional distribution, voltage variants, shipping channels

Step 3 — Writing and internal review

Every article goes through:

Draft production with explicit sourcing for every factual claim
Internal review for accuracy, consistency with other articles on the site, and editorial voice
Pricing verification against live retailer pages on the publish date
Schema markup review to ensure structured data accurately represents the content

Step 4 — Quarterly updates

Every comparison guide and product review is audited quarterly:

Prices re-verified against current retailer listings
Product availability re-checked across all four target markets
New products added to comparison tables where warranted
Discontinued products flagged or removed
The “Last verified pricing” stamp updated

What “hands-on experience” means (and what it doesn’t)

We are transparent about the difference between products we’ve used directly and products we’ve evaluated through aggregated owner data.

When we say “based on hands-on experience”: We mean a named team member has physically used the product in a home growing setting for at least one full grow cycle (typically 4-12 weeks depending on the crop). We specify the product, the approximate duration, and the growing conditions.

When we say “based on aggregated owner reports”: We mean we’ve synthesized patterns from multiple independent owner reviews across Amazon, Reddit, forums, and community pages. We have NOT used the product directly. We always disclose this.

We never imply hands-on testing we haven’t done. If a methodology note says “aggregated owner reports,” that’s exactly what it is.

How we calibrate for food crops

This is the single most important methodological choice on the site. The indoor growing market is overwhelmingly oriented toward cannabis cultivation, which means most available data, most product reviews, and most “recommended settings” are calibrated for cannabis — not food crops. We explicitly re-calibrate everything for food:

PPFD targets: Our light intensity recommendations come from university extension publications for greenhouse vegetable production (Ohio State University Extension HYG-1437, University of Florida IFAS HS1422, Cornell University CEA guidelines, Purdue University Extension) — not cannabis-grow forums. Food-crop PPFD targets are typically 200-900 µmol/m²/s depending on the crop, which is dramatically lower than the 800-1500 µmol/m²/s that cannabis content recommends.

Nutrient recipes: Our hydroponic nutrient recommendations and calculator tools use published agricultural formulas (Masterblend International published recipes, General Hydroponics official feed charts, JR Peters/Jack’s Nutrients technical documentation) cross-referenced against university extension guidelines. We cite the specific source for every recipe we publish.

Climate targets: Temperature, humidity, and photoperiod recommendations come from university extension publications for the specific crops covered, not from cannabis VPD charts.

Equipment sizing: Our CFM (airflow) and tent-size recommendations are calculated from standard ASHRAE air-exchange formulas for enclosed grow spaces at food-crop heat loads — not cannabis-specific heat loads that assume higher-wattage lighting and denser canopies.

How we handle affiliate relationships

Our editorial recommendations are independent of our affiliate relationships. We recommend products based on the evaluation criteria above, then check whether the recommended product has an affiliate program we can join. We do not choose products based on which ones pay the highest commission.

Practical examples of this policy in action:

We recommend the Inkbird ITC-308 ($35, Amazon Associates at 3% = ~$1.05 commission) over the AC Infinity Controller 69 Pro ($99, direct affiliate at ~8% = ~$7.92 commission) for most food growers — because the Inkbird is the right answer for most buyers, even though the AC Infinity pays 7.5x more per sale.
We recommend skipping the carbon filter entirely for ~70% of food growers — which earns $0 in commission — rather than recommending the AC Infinity Air Filtration Kit ($130, ~$10.40 commission) to everyone.
We recommend Tower Garden as a genuine option for buyers who want large-vegetable-capable aeroponics — even though Tower Garden’s MLM distribution model means we earn $0 on Tower Garden purchases (they don’t accept standard affiliates).

Affiliate disclosure is always inline, near the top of every article, not buried in a footer. We also maintain a full Affiliate Disclosure Policy with the complete list of our affiliate relationships.

How ratings work (for product reviews)

Our product reviews include a numerical rating (e.g., 4.4/5). These ratings are editorial judgments, not calculated scores from a weighted formula. They reflect our overall assessment of the product’s performance, value, ease of use, reliability, and availability for the food-growing use case — weighted by our editorial judgment of what matters most for the target buyer.

We don’t use a secret algorithm. We don’t accept payment to change ratings. If a rating seems wrong to you, tell us why and we’ll consider your feedback in the next quarterly update.

Sources we cite

Across the site, we reference these institutional sources for food-crop growing parameters:

Ohio State University Extension — HYG-1437: Hydroponic Nutrient Solution for Optimized Greenhouse Tomato Production
University of Florida IFAS — HS1422: Growing Lettuce in Small Hydroponic Systems
Cornell University — CEA (Controlled Environment Agriculture) guidelines for vegetable production
Purdue University Extension — Optimal fertilizer solution concentration for hydroponic lettuce
Masterblend International — Published 4-18-38 Tomato Formula and 8-15-36 Lettuce Formula recipes
General Hydroponics — Flora Series and Maxi Series published feed charts
JR Peters (Jack’s Nutrients) — 321 formula technical documentation and nutrition schedules
Barrina LED — Published spectrum research on warm-yellow LED performance for tomato fruiting

We link to these sources where they’re cited. If you find a claim on this site that you believe is unsourced or inaccurately attributed, let us know.

Contact us about methodology

If you have questions about how we evaluated a specific product, want to point out a factual error, or believe we’ve made a methodological mistake:

Email: hello@indoorfoodgrower.com

We take factual accuracy seriously and we correct errors promptly.