Top 10 Biggest Blooms for Your Flower Garden

Grow these garden giants and have the biggest blooms on the block.

Bigger is usually better, especially when it comes to blooms. Get your hands on varieties of plants you already know and love with these 10 picks bred to produce massive and prolific flowers. Plus, we’ve included where you can buy every one of these garden giants. Put a few of these giant flowers in the ground and give your neighbors something to talk about.

(But if you’re looking for teeny-tiny flowers, check out Top 10 Miniature Plants for Small Space Gardening!)

Longfield Gardens

Thomas Edison dinnerplate dahlia

Dahlia, zones 8 to 11

Make some room at the back of a sunny garden bed for this 3- to 4-foot purple stunner. The Thomas Edison variety was first introduced in 1929 and remains one
of the best purple dahlias on the market. In places where dahlias aren’t hardy, bring the tuberous roots indoors for the winter and replant in spring.

Why we love it: Dahlias are ideal cut flowers. Display the jumbo 8-inch blooms in vases all over your home.

Where to buy it: Longfield Gardens

Proven Winners

Incrediball hydrangea

Hydrangea arborescens, Zones 3 to 9

Sturdy stems support massive summer-blooming white flowers. The nearly 12-inch blooms begin green, mature to white and then fade back to green later in the season. To encourage new growth and flowering, prune this shrub in late winter.

Why we love it: Unlike other large hydrangeas, Incrediball won’t flop over, even after a strong rain.

Where to buy it: Proven Winners

White Flower Farm

Globemaster allium

AlliumZones 4 to 9

Add major drama to your garden with 8- to 10-inch purple globes. Flower heads burst to life in late spring, featuring densely packed florets that make up the mega blooms.

Why we love it: They’re tall, too! Growing 3 to 4 feet high, these alliums command attention in a landscape.

Where to buy it: White Flower Farm

Heritage Seedlings

Bigleaf magnolia

Magnolia macrophylla, Zones 5 to 8

Although this magnolia is considered a medium-size tree at 20 to 40 feet, it has the largest leaves and flowers of any North American deciduous species. The leaves grow up to 3 feet long and are green on top but have fuzzy silver-gray undersides. Because of the leaves’ size, strong winds might damage them, so plant the tree in a sheltered location in sun or partial shade.

Why we love it: Take a sniff! Fragrant white flowers are 8- to 12-inches across and pop in summer. An up-close look reveals beautiful purple centers.

Where to buy it: Heritage Seedlings

Longfield Gardens

Diva’s Choice daylily

Hemerocallis, Zones 3 to 9

This diva demands attention. Give it a prime spot in your perennial or container garden, and let the 6-inch fragrant flowers shine. With a grand appearance in early summer, the flowers repeat throughout the summer and the fall.

Why we love it: Not only is this pink starlet a big bloomer, it provides interest. From the scalloped yellow trim to the green centers, there’s so much to see. Plus, hummingbirds and butterflies can’t resist the long-lived nectar source.

Where to buy it: Longfield Gardens

W. Atlee Burpee Company

Pikes Peak sunflower

Helianthus, Annual

Give these giants a sunny spot and some room to grow. Fourteen-inch flower heads reach for the sun atop stately stalks as high as 15 feet.

Why we love it: Big seeds mean big plants. This variety produces the largest sunflower seeds in the world. Birds might beat you to the seed harvest, though.

Where to buy it: W. Atlee Burpee Company

Plant Delights Nursery Inc.

Double White angel’s trumpet

Brugmansia Candida, Zones 8 to 10

Grab a chair and settle in next to this angel’s trumpet each evening. The sweet fragrance from just one plant is enough to perfume the whole backyard. Pick a sunny spot for the shrub, and plant it in well-drained soil. Beware: All parts of angel’s trumpet are harmful to humans and pets.

Why we love it: By early fall, as many as 100 ruffled double blooms dangle from stems covered with tobacco-like foliage. Plus, the 10-inch flowers are deer-resistant.

Where to buy it: Plant Delights Nursery, Inc.

White Flower Farm

The President clematis

Clematis, Zones 4 to 8

Find a bare fence, trellis or post and let this climber do its thing. Purple flowers as big as 8 inches flourish in May and June and then again in September and October. Hummingbirds might stop for a sweet treat during fall migration.

Why we love it: The show doesn’t stop when the bold blooms fade—the seed heads are attractive even during the autumn months.

Where to buy it: White Flower Farm

W. Atlee Burpee Company

Summer Storm hibiscus

Hibiscus, Zones 4 to 9

It’s compact for a hibiscus at only about 4 feet tall, but the small size doesn’t affect the showy pink flowers. The 8- to 10-inch flowers wow until fall, when the leaves turn yellow-orange. Plant Summer Storm in full sun and be on the lookout for hummingbird visitors.

Why we love it: Peel your eyes away from the gigantic blossoms and take notice of the beautiful, dark purple foliage.

Where to buy it: W. Atlee Burpee Company

Eden Brothers

California Giants zinnia

Zinnia elegans, annual

Brighten up your backyard with long-lasting, colorful zinnias. Plant a package of seeds in full sun, and soon a rainbow of colors emerges. These heirloom seeds were developed around the 1920s and still delight gardeners today.

Why we love it: Stems may reach 4 feet tall, and the semi-double blooms are 5 inches across. Harvest these giants as cut flowers to add an explosion of color to your kitchen counter.

Where to buy it: Eden Brothers

Kirsten
Kirsten is the executive editor of Birds & Blooms. She's been with the brand in various roles since 2007. She has many favorite birds (it changes with the seasons), but top picks include the red-headed woodpecker, Baltimore oriole and rose-breasted grosbeak. Her bucket list bird is the painted bunting.