S – S
| Salix alba | White willow |
| Salvia officinalis | Sage |
| Salvia sclarea | Clary Sage |
| Sambucus ebulus | European dwarf elder |
| Sambucus nigra | European elderberry |
| Sanguisorba Officinalis | Great burnet |
| Sanicula Europaea | Sanicle, Wood sanicle |
| Saponaria officinalis | Soapwort |
| Sarothamnus scoparius (Cytisus scoparius) | Common broom |
| Satureja hortensis | Savory |
| Scabiosa arvensis | Pincushion flower |
| Scolopendrium Vulgaris | Hart’s-tongue |
| Scopolia carniolica | Henbane bell |
| Scrophularia nodosa | Figwort |
| Sedum acre | Stonecrop |
| Senecio vulgaris | Groundsel |
| Silybum marianum | Milk thistle |
| Sinapis alba | White mustard |
| Sinapis nigra | Black mustard |
| Solanum dulcamara | Bittersweet |
| Solanum aviculare | Kangaroo apple, Pam plum |
| Solidago gigantea | Giant goldenrod |
| Solidago virgaurea | European goldenrod |
| Sophora japonica | Japanese pagoda tree |
| Sorbus aucuparia | Rowan |
| Spartium scoparium (Cytisus scoparius) | Common broom, English broom, |
| Spiraea | Meadowsweet |
| Stachys Officinalis | Common hedge nettle, Betony, Bishop’s wort |
| Stachys recta | Stiff hedge nettle |
| Stachys Officinalis | Betony |
| Stellaria media | Chickweed |
| Succisa pratensis | Devil’s bit |
| Symphytum officinale | Comfrey |