Nature :- the physical world and everything in it ex :- plants, animals, mountains, oceans etc . all those comes to nature .

yess we can grow plants, 
plants are the fabric which covers the soil. They hold the soil in place to reduce erosion and improve water quality. Plants provide our food, materials for shelter, fuel to warm us and replenish the air we breathe. Plants provide food for animals and habitat for wildlife.

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hope its help u
nature is something which we can't make... but we can grow plants..SO??
why do then plants come under nature?