Both words are good.
1. Seed: The word "seed" contains the meaning of seed and life, expressing the parents' expectations and blessings for the girl's future life. It also implies that girls should be like seeds, growing and developing in life to meet future challenges and opportunities.
2. Zi: The word "Zi" has profound cultural connotations, expressing parents' expectations and blessings for girls' growth and development. In ancient times, it was also often used to refer to the catalpa tree in mythology, which means that girls should be like the catalpa tree, growing vigorously and towering into the clouds, showing the vitality and strength of life.