Keystone plants and trees like the Coast Live Oak and California lilac are key players in the health of your garden.

Teri Silver / lawnlove.com San Diego is known for beautiful scenery, a stunning coastline, and professional sports teams, but "America's Finest City" has its share of attractive native plants, too.

Gardeners should keep an eye out for these new tropicals and shrubs, like mangaves, 'Gold Leopard' canna lilies and edible roses.