Landscaping people- what is this called?

(because i am thinking about buying some), I am just wondering what this brick thing surrounding the water fountain and flowers are called, and how much do they usually cost? Here is the pictureStop Pests From Eating Herb Garden?

"how to root" a leyland cypress?

Why some trees smell like sperm????

Washing machine water on your garden?

Why have white particles appeared around the plants in my garden after a few days of heavy rainfall?

Tree and plant listings?

wich is better,to water grass in morning or at night??

Why would someone report an answer that had already been chosen as the best answer by the asker?