Hoping to spread her own love for gardening with other young people, one Belmont teen built a seed library for others to try their hand at the skill. “It’s about the size and shape of a Little Free Library, but instead of books, you have seeds, like carrots, turnips, lettuce — I wanted it to be healthy, for people to enjoy eating them,” said 14-year-old Julia Spitznagel, a student at Belmont High School. With the help of her younger brother,…