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Algeria33 crops Azerbaijan39 crops Bangladesh2 crops Bolivia19 crops Burundi35 crops Cameroon29 crops Cape Verde34 crops Chad43 crops Chile37 crops Colombia30 crops Cote d'Ivoire25 crops Djibouti25 crops Ecuador8 crops Egypt8 crops Equatorial Guinea8 crops Eritrea9 crops Ethiopia9 crops Gabon11 crops Ghana11 crops Guinea11 crops Jamaica1 crops Jordan1 crops Kenya19 crops Korea DPR39 crops Kyrgyzstan19 crops Liberia16 crops Madagascar16 crops Malawi13 crops Mali13 crops Mauritania17 crops Mauritius12 crops Morocco12 crops Mozambique5 crops Myanmar5 crops Namibia5 crops Nepal65 crops Niger16 crops Pakistan35 crops Peru5 crops Rwanda5 crops Sao Tome and Principe1 crops Senegal1 crops Sierra Leone1 crops Somalia3 crops Sri Lanka10 crops Sudan3 crops Swaziland9 crops Tajikistan16 crops Tanzania12 crops Timor Leste16 crops Togo16 crops Tunisia12 crops Uganda12 crops Uzbekistan17 crops Zambia17 crops Zimbabwe17 crops

Data Sources & Methodology

CropWhen combines open agricultural datasets so gardeners and growers can see when to plant and harvest by country and climate zone, plus companion, frost, and plant-care guidance as we expand the site.

1. FAO Crop Calendar

Planting and harvest windows are built primarily from the FAO Crop Calendar, an open dataset of sowing and harvest periods by agro-ecological zone. We standardize crop names, tag each zone to a climate family, and keep the original agronomic notes (including FAO's Spanish, French and Chinese translations where available).

Countries covered: Algeria, Azerbaijan, Bangladesh, Bolivia, Burundi, Cameroon, Cape Verde, Chad, Chile, Colombia, Cote d'Ivoire, Djibouti, Ecuador, Egypt, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Ghana, Guinea, Jamaica, Jordan, Kenya, Korea DPR, Kyrgyzstan, Liberia, Madagascar, Malawi, Mali, Mauritania, Mauritius, Morocco, Mozambique, Myanmar, Namibia, Nepal, Niger, Pakistan, Peru, Rwanda, Sao Tome and Principe, Senegal, Sierra Leone, Somalia, Sri Lanka, Sudan, Swaziland, Tajikistan, Tanzania, Timor Leste, Togo, Tunisia, Uganda, Uzbekistan, Zambia, Zimbabwe.

2. Plant Variety Database (Wind River Greens)

Companion planting pairs, cultivar growing requirements, common pests and diseases, and USDA hardiness-zone frost tables are adapted from the open Plant Variety Database by Wind River Greens, licensed under CC BY 4.0.

Suggested attribution: Plant variety data from Wind River Greens Plant Database (https://plants.windrivergreens.com), CC BY 4.0. Adaptations: mapped to CropWhen crop hubs and country calendars; not an official product of the licensor.

3. OpenPlantDB

Additional plant care notes, frost-tolerance fields, and hardiness-zone frost averages are drawn from OpenPlantDB, released under CC0 1.0 (public domain dedication). We import an edible/crop-focused subset for relevance and performance.

4. Frost dates on CropWhen

Country frost pages combine those hardiness-zone frost tables with a latitude-based zone estimate for each CropWhen country centroid (Southern Hemisphere dates are shifted by about six months). Optional zone overrides let visitors refine the estimate. These are planning averages — not local forecasts.

5. Companion planting

Companion charts aggregate beneficial and harmful pairings from the Plant Variety Database (CC BY 4.0), mapped onto CropWhen crop hubs. Attribution is required and shown on companion pages and this Sources page.

6. Pests & diseases

Pest and disease name lists are aggregated from the same Plant Variety Database cultivar fields (common_pests, common_diseases, resistance notes). They are scouting aids — not laboratory diagnoses. Crop pages and individual issue pages link back to calendars and companion guides.

7. Fertilizer schedules

Crop fertilizer pages combine a category stage checklist (soil prep → planting → mid-season) with FAO Crop Calendar notes that mention fertilization, manure, NPK, or related terms. Numbers in notes are regional field language — not prescriptions for your plot.

8. Weather insights (Open-Meteo)

Country weather pages show monthly temperature and rainfall climate normals (multi-year averages, not live forecasts) near a representative capital / major city, fetched from the free Open-Meteo Geocoding and Historical Weather Archive APIs and cached in CropWhen. Each month links to sowable crop counts from the planting calendar. Open-Meteo data is free for non-commercial use with attribution.

How we handle gaps

Where a country is missing data for a crop that a neighbouring country in the same climate family grows, we may surface a cross-referenced suggestion — always clearly labelled “based on similar agro-ecological conditions” and reviewed before publishing. Frost and hardiness figures are zone-level planning averages; local elevation and microclimate can differ.

Disclaimer

Data is provided for general guidance only. Local conditions, microclimates and seasonal variation matter — always cross-check with local extension services before planting. Open-dataset licenses and attribution links above satisfy reuse terms; CropWhen does not claim ownership of third-party open data.