Oak vs Poplar
Both are Tree. Each axis is a percentile across all 538 crops — 80 means higher than four-fifths of the table. Where an axis is missing, the crop genuinely is not measured that way.
Oak
Poplar
| Measure | Oak | Poplar |
|---|---|---|
| Season | Perennial | Perennial |
| Sowing window | Mar–Apr | Jan–Feb |
| Days to harvest | 60–120 yr | 5–8 yr |
| Spacing | 4 × 4 m | 5 × 4 m |
| Soil pH | 5.5–7.0 | 6.0–8.0 |
| Water | 1000–2000 | 900–1500 |
| Temperature °C | 5–28 | 10–35 |
| Seed rate | Nursery | Entire plants |
| Yield | 2–4 m³/yr | 20–30 m³/yr |
| Watch for | Defoliator, powdery mildew | Defoliator, stem borer |