Not always considered a weed, this plant has purple-pink flowers and is commonly found in grasslands and lawns. Knapweed ( ...

Not all invasive weeds announce themselves with ... Some top leaves have short petioles. During spring, they bloom two-lipped, purple flowers that fade to release seeds in early summer.

Scrambling fumitory is a clambering annual weed that can grow at any time of the year, though most germination is in spring and ... long cotyledons. Flowers are conspicuous clusters of about a dozen ...