Lobelia typically blooms from late spring to early fall, depending on the variety and growing conditions. While some species of Lobelia are perennial, others are annual or biennial. Perennial varieties, like Lobelia cardinalis, can return year after year, providing consistent summer blooms. To ensure continuous flowering, regular deadheading is recommended.
Geraniums(Pelargoniums) are perennials therefore given the right conditions will flower constantly.
The type of flowers that bloom every year without replanting includes perennial flowers. Roses, Plumbago, and hibiscus flowers are all examples of those perennial flowers.
Marigolds do not bloom all year round. They are annual plants that typically bloom in the spring and summer months.
Fuchsia plants bloom from mid-summer all the way into fall.
Gerbera daisies and Shasta daisies are two types that can bloom all summer long with proper care. Gerbera daisies thrive in well-drained soil and full sun, while Shasta daisies are hardy and can tolerate a range of conditions. Regular deadheading and watering will encourage continuous blooms throughout the summer season. Additionally, some perennial varieties, like Oxeye daisies, also provide long-lasting summer blooms.
Not all flowers bloom in the spring those that do so largely because they need to set seed and fruit to the side
Forget-me-nots typically bloom in spring and can continue to flower into early summer, depending on the variety and growing conditions. They generally have a shorter blooming period compared to some other perennial flowers. Once the flowers fade, the plants may still provide greenery but will not produce new blooms until the next season. Regular deadheading can encourage a longer bloom time, but they are not considered all-season bloomers.
Marigolds typically bloom throughout the summer, but the exact duration of their blooming period can vary depending on the specific variety of marigold and the growing conditions.
Blue Mist shrub Caryopteris blooms late summer into fall
Day lilies usually love the summer months. They like it nice and warm. They will usually bloom until August. (P.S. Anyone who is reading this, please elaborate some more, that's all I got ;) )
Most Irises only bloom during their period; usually early summer. As Irises are perennials, they won't be in bloom all season. You could plant different varieties around your Iris to keep the area in color all season.
Perennial flowers will just stay for Spring and Summer. In Autumn and Winter they will disappear and appear the nest Spring. It is just a normal cycle for plants.