Zone 9 has warm temperatures and a long growing season that suits many tropical and subtropical plants. Even with plants that grow as perennials in Zones 10 to 12, you can grow them as annuals in zone 9. For spring planting, start the seeds indoors 4 to 6 weeks before the threat of t...
It’s why we use these 30-year averages in building this map and try to—especially for planting trees—30 years tends to be across all plants, potentially an average lifespan if you factor in herbaceous perennials. But with tree planting, I think most of us plant them with the expectati...