Fernleaf Yarrow 
Feverfew 
Fewleaf Sunflower 
Field marigold 
Field milk thistle 
Field pussytoes 
Field Thistle 
Field Wormwood 
Fiveneedle Pricklyleaf 
Flannel cudweed 
Flat-top White Aster 
Flax-leaved Horseweed 
Flossflower 
Flower of the Andes 
Forest goodenia 
French marigold 
Fringed Water Lily 
Frost Aster 
Frostweed 
Funky thistle 
Gaillardia aristata 
Garden Cosmos 
Garden Dahlia 
Garden Lobelia