Cactus have a large root system to soak up maximal amounts of moisture. They need as much as they can get in the desert with the ground mainly being incredibly dry. The roots have large surface area again to soak up as much moisture as possible.
To exterminate a large cactus, you can cut it down to ground level using a saw or axe. Then, carefully dig around the base of the cactus to expose the roots, and remove as much of the root system as possible. You can also treat the remaining roots with herbicide to prevent regrowth.
The cactus root in the ground beneath the cactus plant.
it helps because
Cacti have either a long tap root or fibrous roots just below the surface of the ground.
Taproot system
Taproot system. A taproot system usually consists of one large main root, with smaller branching roots extending from it. This type of root system is common in dicot plants.
taproot
Tap root.
The tap root is (in most plants) the largest root.
The name of a large cactus commonly found in desert regions is the saguaro cactus.
because long root systems dig deep into the ground where there is more water than near the surface, and if the root systems were shorter, then the cactus wouldn't be able to get the water that it needs to survive.
A taproot system consists of a large central root with smaller lateral roots branching off from it. This type of root system is common in dicot plants and helps provide anchorage and absorb water and nutrients from the soil.