They start their foliage fairly early in the year and don't bloom till July or August. Because their are so many blooms on each plant they are very colorful for 2-3 weeks. Daylilies also come in lots of different colors and shapes. Even after the flowers are gone the greenery looks nice and busy for a couple of weeks longer. Then, when the season is over, they can simply be mowed down with a lawn mower and the mulchings left to help nourish the soil.
Daylilies also multiply rapidly.
So eventually you can have a very full garden. Lots of shrubs would probably be a good choice also if you are low on time. Flowering, fruiting or just plain shrubs. I don't know where you live or what your yard is like so the best thing to do is to go talk to a botanical garden and ask them what grows well in your area. I weed less often than I should but often enough so that the garden doesn't get overrun.