A well-planned flower garden should always have something blooming, and the best way to ensure this is to plant flowers and bulbs that offer a succession of blooms. Get your Indiana garden off to the right start by planting at the right time.
Purdue University recommends gardeners set cool season annuals (like poppy or snapdragon) into the ground in April, once the soil has lost enough moisture to become workable. If the soil feels thick and muddy, wait a couple of weeks so it can dry off, then plant. Warm-season annuals (like geranium or impatiens) should be planted after frost danger passes (late April to early May in Southern Indiana, and mid May in Northern Indiana). Fall-flowering bulbs (like dahlia) and perennial flowers can also be started in the spring.
Little gets planted in the Indiana summer, but it's an important time to maintain flowers and plants. Purdue University recommends removing cold-season annual flowers and plants in June (they'll have started to wilt in the heat). If you're planting spring bulbs (like tulip or daffodil), prepare the soil in August by turning it over with your shovel.
Plant spring-flowering bulbs in late September. Iris, daylily and peony plants can be started during the fall. Perennials can also be started from seed during the autumn months, but plants do best when started in spring.