Cattail vs Watercress
Both are Aquatic. 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.
Cattail
Watercress
| Measure | Cattail | Watercress |
|---|---|---|
| Season | Perennial | Perennial |
| Sowing window | Mar–Apr | Sep–Oct |
| Days to harvest | 12–18 mo | 50–70 |
| Spacing | 60 × 60 cm | 20 × 15 cm |
| Soil pH | 5.5–7.5 | 6.5–7.5 |
| Water | Marshy | Flowing water |
| Temperature °C | 15–32 | 10–20 |
| Seed rate | Rhizomes | Cuttings |
| Yield | 20–30 t | 20–30 t |
| Watch for | Borer, leaf spot | Leaf spot, aphid |