22 places
| Region | Clay | Soil pH | Solar irradiation | Elevation | Slope |
|---|---|---|---|---|---|
| Blaenau Gwent | %19.2 | 5.5 | 1066 | 399 | %16.8 |
| Bridgend | %24.0 | 5.7 | 1097 | 108 | · |
| Caerphilly | %22.9 | 5.9 | 1040 | 225 | · |
| Cardiff | %23.8 | 5.5 | 1057 | 14 | %4.4 |
| Carmarthenshire | %24.2 | 5.9 | 1144 | 150 | · |
| Ceredigion | %23.5 | 5.9 | 1041 | 112 | · |
| Conwy | %23.2 | 5.5 | 1025 | 193 | · |
| Denbighshire | %20.9 | 6.2 | 1053 | 23 | · |
| Flintshire | %24.9 | 5.9 | 1024 | 92 | · |
| Gwynedd | %17.5 | 5.4 | 1014 | 203 | · |
| Isle of Anglesey | %21.7 | 5.6 | 1081 | 76 | · |
| Merthyr Tydfil | %23.1 | 5.8 | 1090 | 179 | · |
| Monmouthshire | %27.4 | 6.5 | 1036 | 47 | · |
| Neath Port Talbot | %24.4 | 5.7 | 1085 | 79 | · |
| Newport | · | · | 1044 | 0 | · |
| Pembrokeshire | %23.2 | 5.9 | 1203 | 44 | · |
| Powys | %20.3 | 5.5 | 1047 | 378 | · |
| Rhondda Cynon Taff | · | · | 1087 | 111 | · |
| Swansea | %20.5 | 5.8 | 1142 | 16 | · |
| The Vale of Glamorgan | %24.4 | 5.9 | 1054 | 35 | · |
| Torfaen | %28.4 | 5.9 | 1058 | 175 | · |
| Wrexham | · | · | 1018 | 88 | · |