Blue Flower List
From soft hydrangeas to tall, airy delphiniums, blue flowers bring a sense of stillness and depth to a cottage garden. Here you’ll find a collection of varieties to help you create your own gentle, blue-toned space.
Blue Nepeta (Cat Mint)
Varieties to Plant:
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Nepeta ‘Blue Wonder’ (12-18 inches)
Compact and tidy, with flowers that skew cool blue rather than purple—great if you want something neater for borders.
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Nepeta ‘Walker’s Low’ (24-30 inches)
Often described as lavender, but in reality it frequently appears blue-violet to blue depending on soil and light. In cooler conditions, it can look surprisingly blue.
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Nepeta ‘Six Hills Giant’ (3-4 feet)
This is probably the classic “blue nepeta.” The flowers lean periwinkle to clear blue, especially early in bloom. It’s vigorous, airy, and very cottage-garden friendly.
Blue Delphinium
Varieties to Plant:
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'Cobalt Dreams’ (4-6 feet)
A striking true cobalt-blue garden favorite with classic white “bee” centers. Tall spikes make an unforgettable backdrop in borders.
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‘Blue Butterfly’ (Delphinium grandiflorum) (12-18 inches)
Compact but intense cobalt blue flowers on a low, bushy plant — perfect for front of the border, containers, or small gardens.
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‘Delphina Dark Blue White Bee’ (14-18 inches)
From the Delphina series, this dwarf type still delivers rich blue blooms with white centers without needing staking.
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‘Million Dollar Blue’ (30-36 inches)
Deep, vibrant blue flowers that stand out even among other blue blooms — a classic choice for cool, moist garden spots.
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‘Summer Skies’ / ‘Summer Nights’ (10-12 inches)
Sky-blue shades that bring a lighter, dreamy tone to your garden palette.
Blue Cornflower (Bachelor's Button)
Varieties to Plant:
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'Blue Boy’ (30-38 inches)
A classic true blue cornflower with vivid color. A good choice for the middle or back of borders and for cutting.
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‘Blue Diadem' (30 inches)
Large, deep blue blossoms on strong stems.
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‘Tall Blue’ (28-36 inches)
Traditional tall cornflower in a rich true blue.
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‘Dwarf Blue/Blue Midget’ (10-24 inches)
Compact blue cornflower for front of beds or containers.
Choosing the right variety is only the first step. Knowing when to sow, how to space them for a natural cottage garden rhythm, and how to keep those rare blue shades true through changing seasons can make all the difference.
I am currently putting the finishing touches on the comprehensive Blue Flower Cottage Garden Guide - complete with growing and care instructions, a seasonal planning timeline, and plant spacing maps to help your garden look effortlessly layered.
Blue Hydrangea
Classic Bigleaf (Hydrangea macrophylla) Blue Favorites
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These are the hydrangeas most people picture when they think of “true blue” cottage garden blooms.
Varieties to Plant:
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‘Nikko Blue’ (4-6 feet)
A classic choice with large, sky-blue mophead flowers in acidic soil and long season color.
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‘Penny Mac’ (4-6 feet)
A reliable rebloomer with light blue mophead flowers and a slightly heat-tolerant nature.
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‘Blue Enchantress™’ (3-5 feet)
As the name suggests, rich blue blooms with strong stems and reblooming ability.
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‘Blue Heaven’ (3-5 feet)
Lush, ethereal blue blooms perfect for borders or accent planting.
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‘Blue Deckle’ (3-4 feet)
Deep blue flowers with uniquely serrated petals add a delicate texture.
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‘Glory Blue’ (3-4 feet)
A compact mophead variety ideal for containers or smaller garden corners.
Lacecap & Mountain Hydrangeas (Delicate Blue Blooms)
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These often have a more refined, flatter bloom form and can be great for mixed cottage beds.
Varieties to Plant:
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Hydrangea serrata ‘Blue Billow' (3-4 feet)
Sky-blue lacecap flowers with soft form.
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Hydrangea macrophylla ‘Blaumeise’ (Blue Titmouse/Teller Blue) (3-5 feet)
Soft, delicate blue lacecaps with charming color.
Nigella (Love-in-a-Mist)
Varieties to Plant:
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‘Miss Jekyll’ (18-24 inches)
A classic soft, muted powder-blue flower with a delicate vintage look.
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‘Oxford Blue’ (20-30 inches)
Deeper true blue blooms; often slightly richer in color than common strains.
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‘Pretty in Blue’ (12-18 inches)
Bright, clear sky blue petals that stand out in mixed beds or bouquets.
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‘Blue Moon’ (12 to 24 inches)
Subtle silvery-blue tones with a dreamy, romantic appearance.
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‘Dwarf Blue’ (10 inches)
Compact, intense blue variety ideal for borders or containers.
Blue Flax
Varieties to Plant:
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‘Royal Blue’ (12-30 inches)
A classic blue-flowered variety with true sky-blue blooms. Compact and reliable in perennial beds.
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‘Blue Sapphire’ (10-15 inches)
Slightly deeper blue flowers with a long flowering season. Great for borders and pollinator gardens.
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‘Grandiflorum/Blue Flax’ (12-24 inches)
Large, vivid blue flowers on delicate stems. A cottage-garden favorite.
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‘Fairy Hair’ (12-24 inches)
Finer, more airy foliage with soft blue flowers. Works well in meadow plantings or alongside grasses.
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‘Blue Moon’ (12-16 inches)
Slightly taller habit with abundant blossoms. Lovely naturalistic look in mixed borders.
Bring the Blue Garden Vision to Life
Designing a truly cohesive blue cottage garden takes more than guesswork. Get all the secrets delivered straight to your inbox when the Blue Flower Cottage Garden Guide officially launches.
Inside the Guide:
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Complete Growing & Care Instructions: Detailed needs for each featured blue variety.
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The Seasonal Timeline: Know precisely when to plant, nurture, and enjoy your blooms.
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Custom Spacing Maps: Lay out your borders with confidence for that lush, tumbling cottage aesthetic.