Common Primrose

Snake plant's succulent tissues contain saponins that can inhibit germination of delicate wildflowers

Mountain flax creates dense shade and may release compounds that inhibit understory wildflowers

Persian buttercup contains ranunculin which can inhibit other herbaceous flowering plants

Mexican heather's dense shrubby growth can shade and suppress low-growing wildflowers

Leguminous shrubs like Genista can release compounds that inhibit woodland wildflowers and compete for shallow root space

Tree dahlia's large size creates dense shade that suppresses low-growing spring wildflowers

Purple shamrock's oxalic acid and aggressive spreading can inhibit and crowd out primrose

Reindeer lichen produces usnic acid and other compounds that can inhibit vascular plant growth