leon urus sibiriacus, mother war
蓷 is a rare kanji referring to a specific plant, Leonurus sibiricus (motherwort), and the obscure term 'mother war' likely relates to its traditional medicinal use. Its meaning is narrow and botanical.
蓷 combines the grass radical 艹 with 推, which likely serves as a phonetic component. The exact historical development is uncertain, but it is a phono-semantic compound for a plant name.
The grass top 艹 indicates a plant, and the bottom 推 suggests pushing or recommending—imagine a plant so useful it is 'pushed' as a remedy, fitting motherwort's herbal use.
For タイ, picture a tie-dyed cloth wrapped around a bundle of motherwort: tie -> タイ, tying the plant to its reading.