Why does Rakesh circle the plant with some pebbles?

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CUET English Language Comprehension Passage 15 — practice the complete quiz, review flashcards, or try a random question.

Rakesh was on his way home from school when he bought the cherries. He paid fifty paise for the bunch. It took him about half-an-hour to walk home, and by the time he reached the cottage there were only three cherries left.     'Have a cherry, Grandfather,' he said, as soon as he saw his grandfather in the garden. Grandfather took one cherry and     Rakesh promptly ate the other two. He kept the last seed in his mouth for some time, rolling it round and round on his tongue until all the tang had gone. Then he placed the seed on the palm of his hand and studied it. 'Are cherry seeds lucky?'... Show more

Why does Rakesh circle the plant with some pebbles?