# BBCH-scale (bean)

In biology, the BBCH-scale for beans describes the phenological development of bean plants using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of bean are:
| Growth stage | Code | Description |
| 0: Germination | 00 | Dry seed |
| 0: Germination | 01 | Beginning of seed imbibition |
| 0: Germination | 03 | Seed imbibition complete |
| 0: Germination | 05 | Radicle emerged from seed |
| 0: Germination | 07 | Hypocotyl with cotyledons breaking through seed coat |
| 0: Germination | 08 | Hypocotyl reaches the soil surface; hypocotyl arch visible |
| 0: Germination | 09 | Emergence: hypocotyl with cotyledons break through soil surface ("cracking stage") |
| 1: Leaf development | 10 | Cotyledons completely unfolded |
| 1: Leaf development | 12 | 2 full leaves (first leaf pair unfolded) |
| 1: Leaf development | 13 | 3rd true leaf (first trifoliate leaf) unfolded |
| 1: Leaf development | 1 . | Stages continuous till ... |
| 1: Leaf development | 19 | 9 or more leaves (2 full leaves, 7 or more trifoliate) unfolded |
| 2: Formation of side shoots | 21 | First side shoot visible |
| 2: Formation of side shoots | 22 | 2nd side shoot visible |
| 2: Formation of side shoots | 23 | 3rd side shoot visible |
| 2: Formation of side shoots | 2 . | Stages continuous till ... |
| 2: Formation of side shoots | 29 | 9 or more side shoots visible |
| 5: Inflorescence emergence | 51 | First flower buds visible |
| 5: Inflorescence emergence | 55 | First flower buds enlarged |
| 5: Inflorescence emergence | 59 | First petals visible, flowers still closed |
| 6: Flowering | 60 | First flowers open (sporadically within the population) |
| 6: Flowering | 61 | Beginning of flowering: 10% of flowers open$^1$ Beginning of flowering$^2$ |
| 6: Flowering | 62 | 20% of flowers open$^1$ |
| 6: Flowering | 63 | 30% of flowers open$^1$ |
| 6: Flowering | 64 | 40% of flowers open$^1$ |
| 6: Flowering | 65 | Full flowering: 50% of flowers open$^1$ Main flowering period$^2$ |
| 6: Flowering | 67 | Flowering finishing: majority of petals fallen or dry1 |
| 6: Flowering | 69 | End of flowering: first pods visible$^1$ |
| 7: Development of fruit | 71 | 10% of pods have reached typical length$^1$ Beginning of pot development$^2$ |
| 7: Development of fruit | 72 | 20% of pods have reached typical length$^1$ |
| 7: Development of fruit | 73 | 30% of pods have reached typical length$^1$ |
| 7: Development of fruit | 74 | 40% of pods have reached typical length$^1$ |
| 7: Development of fruit | 75 | 50% of pods have reached typical length, beans beginning to fill out$^1$ Main pod development period$^2$ |
| 7: Development of fruit | 76 | 60% of pods have reached typical length$^1$ |
| 7: Development of fruit | 77 | 70% of pods have reached typical length, pods still break cleanly$^1$ |
| 7: Development of fruit | 78 | 80% of pods have reached typical length$^1$ |
| 7: Development of fruit | 79 | Pods: individual beans easily visible$^1$ |
| 8: Ripening of fruit and seed | 81 | 10% of pods ripe (beans hard)1 Seeds beginning to mature$^2$ |
| 8: Ripening of fruit and seed | 82 | 20% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 83 | 30% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 84 | 40% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 85 | 50% of pods ripe (beans hard)$^1$ Main period of ripening2 |
| 8: Ripening of fruit and seed | 86 | 60% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 87 | 70% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 88 | 80% of pods ripe (beans hard)$^1$ |
| 8: Ripening of fruit and seed | 89 | Fully ripe: pods ripe (beans hard)$^1$ |
| 9: Senescence | 97 | Plants dead |
| 9: Senescence | 99 | Harvested product |
1 For varieties with limited flowering period 2 For varieties in which the flowering period is not limited