Poplar vs Willow
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.
Poplar
Willow
| Measure | Poplar | Willow |
|---|---|---|
| Season | Perennial | Perennial |
| Sowing window | Jan–Feb | Jan–Feb |
| Days to harvest | 5–8 yr | 5–8 yr |
| Spacing | 5 × 4 m | 3 × 2 m |
| Soil pH | 6.0–8.0 | 6.0–7.5 |
| Water | 900–1500 | 900–1600 |
| Temperature °C | 10–35 | 5–30 |
| Seed rate | Entire plants | Cuttings |
| Yield | 20–30 m³/yr | 12–18 m³/yr |
| Watch for | Defoliator, stem borer | Rust, stem borer |