I saw a field full of roadside thistles.

I saw a beautiful roadside thistle while hiking.

The plumed thistle is a type of weed that has sharp spines.

Bull thistles are invasive plants that can quickly take over a garden.

Spear thistles are common weeds in this area.

I found a field full of sow thistles.

I planted several milk thistles in my garden.

The spear thistle is a biennial herb with purple flowers.

The marsh thistle is a beautiful flowering plant that grows in wetland areas.

Canada thistle is a common weed found in agricultural fields.