Step 1: What a double pot is:
A double pot is a setup of two pots. A smaller pot holding the plant sits inside a larger pot. The gap between the two is filled with moist material such as moss, sand, gravel or coir.
Step 2: Keeps roots cool:
The filling between the pots acts as a cushion. It protects the roots from heat and sudden changes in temperature.
Step 3: Gives humidity and saves water:
The moist filling releases water vapour slowly. This raises humidity around the plant and cuts the need for frequent watering.
Step 4: Protects the floor and the plant:
The outer pot holds extra water, so the floor stays dry. The inner pot is easy to lift out for repotting or cleaning.
Step 5: Looks better:
A neat outer pot hides a plain inner pot, so the plant looks more attractive indoors.
Final Answer:
Double pots keep roots cool and moist, give humidity, save water and improve looks.