What is full sun?
I'm searching for spots in my yard to plant some perennials and I need some help in understanding what "full sun" means. So many instructions call for "full sun", but most of my yard gets shade part of the day - less in winter than in summer. And it's very hot in summer where I live. How many hours is "full sun"? At what season of the year should I time the sunlight in any particular spot? Do plants require fewer hours of sun in hot climates than in more temperate ones?