Add splashes of bold, vivid colour to your garden with summer flowering bulbs that offer interesting shapes not available in non-bulb flowers. When choosing flower bulbs, look for uniform colour and remember that the larger the bulb, the larger the flower. Plant summer-flowering bulbs during the spring season in soil temperatures over 12.8 degrees Celsius, when frost is no longer a threat. Come summer, prepare for a bright, thriving gardening space.
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Cannas are upright summer flower bulbs that bloom from June through August. They dazzle with red, orange and yellow flowers, and their large leaves come in a combination of green and purple hues. Cannas thrive in full sunlight and prefer moist soil rich, according to the Oregon State University Department of Horticulture. Cannas grow to a height of 36 inches with a spread of 4 to 6 inches. Plant in USDA Hardiness Zones 7 to 10.
Crocosmia are summer flower bulbs that bloom from the middle of the summer season through fall. The name "crocosmia" means "saffron smell," and in moist conditions, crocosmia emit a saffron-like fragrance, according to the Washington State University Clark County Extension. These summer flowers display blossoms in red, orange and yellow on arching stems with spiked leaves in light green. They thrive in full sunlight or partial shade in extremely hot temperatures, and prefer slightly acidic, moist, well-drained soil. Crocosmia plants may reach up to 5 feet in height and are best suited to USDA Hardiness Zones 6 to 10.
Rain lilies are summer-flowering bulbs that display delicate blossoms in red, rose, orange, pink, yellow or white, with foliage resembling grass, according to the University of Florida IFAS Extension. Bloom time is generally late in the summer season. Rain lilies thrive in full sun or partial shade, and they grow well in a wide variety of soils including clay, sand and acidic to slightly alkaline pH levels. These summer bulbs grow to a height and spread of 6 to 12 inches. Plant in USDA Hardiness Zones 7B to 11.
Tuberous begonias are hybridised summer flower bulbs that are available in a vast array of colours except for blue, according to the Washington State University Extension. Tuberous begonias display three blooms per stalk. These begonias need partial shade with slight exposure to direct sunlight, as well as high humidity. Tuberous begonias prefer moist soil but do not tolerate wet sites or drought. Growing to a height of up to 20 inches in height, tuberous begonias are suited to all USDA Hardiness Zones.
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- University of Florida IFAS Extension: Zephyranthes spp. Rain Lily
- Washington State University Clark County Extension: African Bulbs (part three of a series): Crocosmia
- Clemson University Extension: Summer- & Fall-Flowering Bulbs
- Washington State University Extension: Tuberous Begonias
- Oregon State University Department of Horticulture: Canna spp.