Is Zakat obligatory on flowers such as Saffron, Safflower, and Cotton?

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Zakat is not obligatory on flowers such as saffron, safflower, and cotton because they are neither grain nor fruit, nor are they measured by volume, thus resembling vegetables on which Zakat is not due. Ahmad stated that there is nothing due on cotton and that there is no Zakat on saffron. This is the apparent position of Al-Khiraqi and the chosen view of Abu Bakr.