How to get Wormwood on Phoenix Reborn?

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I am playing the Phoenix Reborn modpack and run into troubles creating wormwood (from witchery). The problem is, I think, the combination with agricraft, which makes it such that:
1) Wheat can't be planted on Farmland (but on Fertilized dirt) 2) On right click, the wheat is harvested; this interferes with the requirement to right-click the fully grown wheat with the mutating sprig.
Problem 1 is solved by using fertilized dirt (although I think that's not intended). Is there a way around problem 2?
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