Lobelia - BHG Top Shade-Loving Annuals: Add lobelias to bring rich, true blues in the garden. These trailing plants flower prolifically in spring and fall, almost covering themselves in flowers. Annual lobelia is a cool-season plant that does best in shade in the South, though it loves partial shade in the North.
A Gardener's Checklist for Early Spring. expert advice on winter cleanup, spring pruning, sowing seeds, planting late-season bulbs, creating containers, dividing perennials, planting trees, and planning a vegetable garden
Add height to a garden with tall-growing hollyhock. See more perennials that make a big impact: http://www.bhg.com/gardening/flowers/perennials/big-perennials-for-big-impact/?socsrc=bhgpin041613hollyhock=7