If you haven't planted pansies or violas to jump start your spring garden you're robbing yourself of weeks of additional color. And no matter how mild March might be there's precious little color to be had before April in a Chicagoland garden, and that includes bulbs. Cue the pansies and violas, center stage.
While pansies and violas are in the same genus and species (Viola x wittrockiana), here's an admittedly simplistic differentiator. Violas are essentially small-flowered pansies that bloom more profusely than pansies. Those wanting to quibble should find a taxonomist that cares. Here's why they're both worth the effort:
Culturally, what do they ask in return for all this garden gorgeousness? Not much. Pansies and violas dislike heat and humidity equally. So, site them in full sun and enjoy the spring show until the temps start pushing 80 degrees. When they start getting "stretchy" and lax about reblooming, think "Discard" and move on to your summer crop of heat-tolerant annuals. Or, if you want to stretch the return on your spring horticultural investment, site them in an area where they'll receive afternoon shade when it gets warm. You'll squeeze additional weeks of bloom from them with that trick.
Keep pansies and violas evenly moist, especially as day and night temps remain elevated. The other recommendation is to deadhead. Timely removal of spent flowers really resets the bloom button and keeps the show going. Then there's feeding. While they're not particularly conspicuous consumers an application of a timed-release fertilizer at planting time, or several applications of a high phosphorous (P= middle number in a 10-15-10 analysis) water soluble product during their springtime with you will make a world of difference in bloom performance.
A few noteworthy series:
Oops, I forgot to mention the flowers are edible - great as a garnish or to color zap a salad. Honest. Pass the pansies, please.