Meaning of もちぐさ in Japanese

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Definition of もちぐさ

もちぐさ(mochigusa) 【餅草】

もちぐされ(mochigusare) 【持ち腐れ】

(n) unused possession
コンピューターの使い方も知らないのに、あんなに高いマシンを買って。宝の持ち腐れだよ。
What a waste to buy such an expensive machine even though he doesn't even know how to use computers.

たからのもちぐされ(takaranomochigusare) 【宝の持ち腐れ】

(n) pearls thrown before swine; unused possession; useless possession; waste of talent