This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
葶 combines the grass radical 艹 with 亭, which likely provides the sound. The exact historical development is uncertain.
The grass top 艹 over 亭 suggests a plant, but without a clear meaning, picture an unknown weed growing by a pavilion (亭).
For テイ, imagine a tea plant (tea -> テイ) growing under the grass top 艹, even though the kanji's meaning is uncertain.