Lawn & Garden Gardening

These 10 Flowering Plants Boast the Biggest Blooms

Bigger is better with these massive flowers that you can grow at home.
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Showy Flowers

Big flowers are fun! They add color, structure, and a “WOW!” factor to your landscape like nothing else. If you’re looking for plants with colossal color, check out these 10 flowering plants boasting the biggest blooms.

Titan Sunflower (Helianthus annuus ‘Titan’)

This sun-loving annual lives up to its name in every way. Titan grows thick, sturdy stalks up to 12 feet tall, and produces truly titanic flower heads measuring up to 24 inches across. At the end of the growing season it produces huge, edible sunflower seeds. Plant drought-tolerant sunflowers in full sun. Annual.

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‘Giant White’ Moonflower (Ipomea alba ‘Giant White’)

Moonflower is the night-blooming sibling of morning glory. It’s the perfect big bloomer for nocturnal gardeners. The immense 6-inch snowy white flowers of Giant White open at dusk and close at dawn from mid to late summer. Grow this vine on a trellis or arbor near a patio or balcony where you can enjoy the celestial glow and sweet scent in the moonlight. Annual.

Kelvin Floodlight Dahlia (Dahlia ‘Kelvin Floodlight’)

“Dinner plate” dahlias grow massive blooms, large enough to cover a plate. The 10-inch buttery yellow flowers of Kelvin Floodlight make you want to go back for seconds. Plant them in a sunny location, in rich, well-drained soil. This dahlia makes a great focal point in a perennial border. The plant grows 3 to 4 feet tall and blooms from mid-summer until frost. Perennial, hardy in USDA zones 3 to 10.

Round ‘n Purple Allium (Allium ‘Round ‘n Purple’)

These awesome ornamental onions produce gigantic globes of 10-inch silvery purple flowers from mid to late spring. Round and Purple alliums grow to 36 inches tall. They tolerate poor soil in full sunlight and grow back year after year. These plants can naturalize in open areas, or work well in a perennial border. Perennial, hardy in USDA zones 4 to 9.

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Supernova Angel’s Trumpet (Brugmansia x ‘Supernova’)

This is one of the best jumbo-flowering perennials for sunny container gardens. It grows fast and makes huge trumpet-shaped flowers up to 18 inches long and 10 inches wide. Supernova is a tropical shrub with stems that die back like other perennials in the cooler extent of its range. In the warmer parts of its growing range, Supernova is a deciduous shrub (drops its leaves in winter). Perennial, hardy in USDA zones 8 to 11.

Big Brother Lily (Lilium x ‘Big Brother’)

Fragrant and absolutely breathtaking, Big Brother giant lily produces humongous yellow-throated white flowers up to 15 inches across. They make awesome cut flowers for a big, bold statement. This tall hybrid lily grows up to 6 feet high in sunny, well-draining garden beds. Perennial, hardy in USDA zones 3 to 8.

Big Daddy Hydrangea (Hydrangea macrophylla ‘Big Daddy’)

Most flowering plants need full sun to look their best, but not hydrangeas. Big Daddy grows tons of ginormous flowers, up to 14 inches in diameter, in filtered sunlight or afternoon shade. Plant these hydrangeas en masse, or as an informal border plant. Bloom color varies based on soil pH. Acidic soil makes blue flowers, while alkaline soil produces pink ones. Deciduous shrub, hardy in USDA zones 6 to 9.

‘Moy Grande’ Hibiscus (Hibiscus x ‘Moy Grande’)

If you’re looking for a pop of color, your search is over. Moy Grande produces stunning deep pink to red flowers up to 12 inches across. This hardy hibiscus grows best in average to moist soil and full sun. Plant it as a seasonal focal point in your perennial border. Perennial, hardy in USDA zones 7 to 10.

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Atlas Magnolia (Magnolia x ‘Atlas’)

Magnolias are renowned for their heavenly scent and large blooms. At more than 13 inches, this one has some of the biggest flowers of all. Atlas is a deciduous magnolia that bears its gigantic light pink flowers on bare branches in the early spring, followed by large, dark green leaves. Plant it in an open area where it has room to grow 25 feet tall and wide. Hardy in USDA zones 7 to 10.

Fireworks Clematis (Clematis x ‘Fireworks’)

At up to 8 inches across, Fireworks clematis has one of the largest blooms of its kind. This stunning perennial vine grows up to 12 feet tall and blooms heavily from spring to early summer. It makes a beautiful screen when trained on a trellis. Or, use it to adorn an arbor over a garden pathway. Perennial, hardy in USDA zones 4 to 9.