Like many wildflowers, the plants prefer full sun in mild climates and partial shade in the hottest regions. They tolerate a wide variety of soil as long as it drains well. Cornflowers perform the best in mild climates with moderate water, but they can withstand drought.  A perfect plant for xeriscape landscaping where little to no water usage is required. Bachelor's Button flowers are very attractive to both bees and butterflies, but deer leave the plants alone. Cornflowers are annuals, but they can self-sow, dropping their own flower seeds to provide next year's display.