# PlantGrail

> PlantGrail is an iPhone app that tells you what is wrong with a houseplant from one photo, answers follow-up questions and tracks recovery. plantgrail.com is its companion site: written houseplant care guides, diagnosis pages and a free web symptom checker.

Updated 2026-10-19. Page URLs end with a trailing slash. Send `Accept: text/markdown` to any HTML page to get a Markdown version.

## The iPhone app

- [PlantGrail app](https://plantgrail.com/scan/): What the app does, free scans, pricing and screenshots
- [PlantGrail on the App Store](https://apps.apple.com/app/id6768977230): Download for iPhone

## Core pages

- [Home](https://plantgrail.com/): Care guides, the free symptom checker and the app
- [Plant directory](https://plantgrail.com/plants/): One page per houseplant with care basics and known problems
- [Plant problems](https://plantgrail.com/problems/): Problems grouped by symptom, pest, disease, watering and environment
- [Care guides](https://plantgrail.com/articles/): All English articles
- [Symptom checker](https://plantgrail.com/tools/diagnose/): Pick a plant to find its written problem guides, no login
- [Lexicon](https://plantgrail.com/lexicon/): Plant names, scientific names and problem types
- [About and methodology](https://plantgrail.com/about/): How guides are written, sourced and reviewed
- [Contact PlantGrail](https://plantgrail.com/contact/): hello@plantgrail.com for corrections, API and editorial questions

## PlantGrail developer resources

- [PlantGrail OpenAPI specification](https://plantgrail.com/openapi.json): OpenAPI 3.1 document for LLM function calling (operationIds, typed parameters, JSON error schemas)
- [PlantGrail API documentation](https://plantgrail.com/docs/): Authentication, endpoints, example requests and rate-limit headers
- [PlantGrail developer hub](https://plantgrail.com/developers/): Public REST API, markdown negotiation and webhook boundaries
- [PlantGrail OpenAPI YAML](https://plantgrail.com/api/openapi.yaml): Same spec in YAML

## Care guides

- [Monstera deliciosa care](https://plantgrail.com/articles/monstera-deliciosa-care-complete-guide-to-growing-a-healthy-swiss-cheese-plant/): Light, watering, support, repotting and problems
- [Snake plant care](https://plantgrail.com/articles/snake-plant-complete-care-guide-light-water-and-root-rot-rescue/): Light, watering, repotting and root rot rescue for Dracaena trifasciata
- [Pothos care](https://plantgrail.com/articles/pothos-mastery-the-ultimate-care-guide-for-all-varieties/): Light, watering, pruning and common problems for Epipremnum aureum
- [Calathea care](https://plantgrail.com/articles/calathea-and-goeppertia-care-guide-keeping-prayer-plants-alive/): Light, water quality, humidity and brown edges
- [Philodendron care](https://plantgrail.com/articles/philodendron-care-complete-from-heartleaf-to-rare-varieties/): Climbing and self-heading types
- [Fiddle-leaf fig care](https://plantgrail.com/articles/fiddle-leaf-fig-complete-care-guide/): Light, watering, leaf drop and brown spots for Ficus lyrata
- [Rubber plant care](https://plantgrail.com/articles/rubber-plant-complete-care-guide/): Light, watering, leaf drop and propagation for Ficus elastica
- [ZZ plant care](https://plantgrail.com/articles/complete-zz-plant-care-guide-everything-you-need-to-know/): Rhizome watering, potting mix, repotting and propagation
- [Hoya care](https://plantgrail.com/articles/hoya-complete-care-guide/): Light, watering, flowering and problems
- [Spider plant care](https://plantgrail.com/articles/spider-plant-complete-care-guide/): Light, water, brown tips and plantlets
- [Alocasia care](https://plantgrail.com/articles/alocasia-complete-care-guide/): Watering, leaf loss, dormancy and corm checks
- [Peace lily care](https://plantgrail.com/articles/peace-lily-care-the-complete-guide/): Light, watering, feeding, repotting and problems
- [Indoor succulent care](https://plantgrail.com/articles/the-ultimate-succulent-care-bible-everything-we-need-to-know/): Light, watering, gritty mix, pots, winter rest and propagation
- [How to water houseplants](https://plantgrail.com/articles/the-complete-watering-guide-how-to-water-houseplants-correctly/): When to water, how much, and wet vs dry wilting
- [Houseplant light requirements](https://plantgrail.com/articles/light-requirements-for-50-houseplants-the-complete-guide/): Indoor plants grouped by low, medium and bright light
- [When to repot](https://plantgrail.com/articles/8-signs-your-plant-needs-repotting-now/): Signs to check and how to repot step by step
- [Propagation methods](https://plantgrail.com/articles/complete-plant-propagation-bible-every-method-that-actually-works/): Stem, leaf, division, offsets and layering
- [Seasonal care calendar](https://plantgrail.com/articles/year-round-plant-care-calendar-the-complete-month-by-month-guide/): What to change each season

## Diagnosis and treatment

- [Save a dying houseplant](https://plantgrail.com/articles/9-ways-to-revive-a-dying-plant-emergency-protocol-that-works/): Check roots, water, light, pests and temperature
- [Symptom flowchart](https://plantgrail.com/articles/plant-doctor-symptom-diagnosis-guide-the-complete-diagnostic-flowchart/): Symptoms, likely causes and what to check
- [Root rot causes](https://plantgrail.com/articles/root-rot-the-silent-killer-of-houseplants-how-to-spot-it-before-it-s-too-late/): Pythium, Phytophthora, wet mix and prevention
- [Houseplant pests](https://plantgrail.com/articles/8-most-effective-pest-treatments-community-voted/): Identify spider mites, mealybugs, scale and more, then treat from least toxic up
- [Neem oil vs insecticidal soap](https://plantgrail.com/articles/neem-oil-vs-insecticidal-soap-pest-treatment-comparison/): How each works and which plants they can burn

## Comparisons

- [LECA vs soil](https://plantgrail.com/articles/leca-vs-soil-7-root-health-metrics-from-plant-grail-data/): Water, air, nutrients and salts
- [Terracotta vs plastic pots](https://plantgrail.com/articles/terracotta-vs-plastic-pots-7-data-backed-differences/): Drying, weight, salts and which plants suit each
- [Pothos vs philodendron](https://plantgrail.com/articles/pothos-vs-philodendron/): How to tell them apart and how care differs
- [Snake plant vs ZZ plant](https://plantgrail.com/articles/snake-plant-vs-zz-plant/): How to tell them apart and how care differs
- [Monstera deliciosa vs adansonii](https://plantgrail.com/articles/monstera-deliciosa-vs-adansonii/): How to tell them apart and how care differs

## Optional

- [Courses](https://plantgrail.com/courses/): Paid care courses
- [Newsletter archive](https://plantgrail.com/newsletter/): Past issues