Earlier it was difficult get the productivity in cardamom as rate of reproduction was low and now productivity increase due to bisexual reproduction Source: http://nif.org.in/innovation/budding_in_nutmeg_trees/115
Nutmeg (Myristica Sp) is the seed or ground spice of several species of the genus. It is a unisexual plant. After planting several nutmeg trees only a few grow to be female plants bearing nutmeg fruits. The remaining are male tree.
Link: By adopting these grafting techniques all nutmegs trees turn bisexual and productive. He does budding in others’ fields also and charge small amount for the same. Source: http://nif.org.in/innovation/budding_in_nutmeg_trees/115
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