When looking for the perfect trio for the thriller, filler, spiller method, you can't go wrong with striped petunias (Petunia × hybrida), lobelias (Lobelia erinus), and coleus (Coleus scutellarioides) ...

If you love blue, Lobelia is the perfect choice because there are so many cultivars available in every shade of blue. ‘Blue Moon’ has dark blue flowers; ‘Cambridge Blue’ has clear, soft blue flowers, ...

Choose cascading types for the best show of trailing flowers. This ground-hugging lobelia is usually grown as an annual in cool spring weather. For at least a few months, you can enjoy a vivid blue ...