- Sacred garlic pear
- Safflower
- Saga tree
- Sage
- Sahara mustard
- Salad Burnet
- Salsify
- Saltwort
- Samphire
- Sampson's St.Johnswort
- Sassafras
- Saw palmetto
- Scorzonera
- Sea Beet
- Sea Blite
- Sea Purselane
- Sea purslane
- Sea Rocket
- Seacale
- Seep monkey flower
- Sensitive fern
- Serpent Garlic
- Sesame
- Sesban
- Seven Sisters Rose
- Sheeps Sorrel
- Shell ginger
- Shepherd's Purse
- Showy Milkweed
- Siberian elm
- Silk tree
- Silvervine
- Slender amaranth
- Small Goosefoot
- Snake Gourd
- Soap-pod
- Solitary fishtail palm
- Sorrel
- South American cotton
- Southern Huauzontle
- Sow Thistle
- Soya Bean
- Spear thistle
- Spiked Pepper
- Spinach
- Spiny amaranth
- Spiny-fruited Catchweed
- Spiny-leaved sow thistle
- Spleen Amaranth
- Spotted golden thistle
- Squash
- Star Gooseberry
- Stinging Nettle
- Stink Grass
- Strawberry Blite
- Stubble Turnip
- Sweet Acacia
- Sweet Basil
- Sweet Rocket
- Sweet Trefoil
- Sweet Violet
- Sword bean
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