This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蕟 combines 艹 (grass) with 發, but the exact historical development and original meaning are uncertain. It may be a variant or derivative of 發 with a plant-related nuance, but this is speculative.
The top is grass 艹, and the bottom is a complex shape resembling 發 (depart, emit). Picture a rare plant that shoots out seeds, but its exact meaning is unclear.
For ハイ, imagine a rare plant that grows high up on a mountain: high -> ハイ, though the kanji's meaning is uncertain.
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