12 Stunning Flower Seeds You Can Still Sow in June for Bold Late-Summer Color That Lasts Into Fall

Look, we’ve all been there. It’s mid-June, you look out at your garden, and you just… sigh. The tulips are dead and gone, the peonies have shattered everywhere, and you’re left with these big, annoying gaps where it feels like nothing will happen for months. It’s tempting to just give up and figure you’ve missed your chance to have a show this year.

But honestly? You haven’t.

I’ve found that the gardening industry puts way too much pressure on us to have everything finished by May. But some of the absolute best flowers—the ones that actually survive the July heat—don’t even like the cold, damp soil of spring. They need the heat to wake up.

If you get these seeds in the ground now, they skip all that “nursery shock” that makes store-bought plants sit there and do nothing for three weeks. They grow fast, they grow tough, and they usually end up looking way better than anything you’d pay for in a plastic pot.

Whether you want to fill your empty spots with something tall and wild, or you’re trying to keep the bees and butterflies around until the very last minute, these plants are your best bet. Forget the mid-summer slump. We’re going to fill those holes, and I promise you’ll have a yard that’s actually worth looking at right through until the frost.

Here are the 12 seeds that will make your garden finish the year way stronger than it started.

1. Coreopsis (Coreopsis tinctoria)

Have you ever looked at a bare patch in your garden in early June and thought it was too late to get a bold splash of color this year? Wait! You can absolutely still get an extraordinary show. Plains Coreopsis is a true treasure for late sowing. The tiny seeds germinate in a flash in the warm earth, and before you know it, you will have these sprawling, airy green clouds of finely textured leaves gracing your borders.

And the flowers! They burst open in brilliant, intense golden yellow, often with striking mahogany or crimson centers that look like they were painted on the upper page of the petals.

But what really makes it special is how it plays with others, especially if you are working on a naturalized, no-dig meadow setup. You want to scatter these seeds right alongside later-blooming native companions.

Imagine them weaving through the sturdy, upright stems of Purple Coneflowers, or contrasting beautifully with the fuzzy, lavender-blue spikes of Anise Hyssop. They also snuggle perfectly around the base of taller ornamental grasses like Little Bluestem, injecting cheerful energy into those late summer days when other plants are starting to look tired.

Of course, it is a phenomenal draw for wildlife; our native bees absolutely love the open blooms, and you will see goldfinches practically dancing on the stems to reach the papery seedpods in the fall.

Even if you are dealing with the heavy clay and unpredictable late-spring frosts we so often see in Zone 6, these resilient little plants will forgive you and flourish anyway!

2. Corn Cockle (Agrostemma githago)

Have you ever thought about letting a piece of your garden go beautifully, intentionally wild? If you are slowly replacing a patch of tired turf to create a vibrant, living meadow, Corn Cockle is exactly the kind of untamed magic you need. While historically known as a rogue wildflower that famously sneaked its way into ancient wheat fields, today it is a celebrated superstar for late-season, naturalistic color.

Sowing these slender black seeds directly onto a sun-drenched, no-dig patch in June guarantees a fast, elegant explosion of growth.

They push up the most graceful, slender stems clothed in fine, silvery hairs that literally catch the late-summer light. And when they open, the effect is magnificent! They unfold into wide, shallow magenta cups, with delicate dark speckling radiating out from the center.

Because they have such a delightfully wispy, see-through architecture, they love to lean and sway. You simply must weave them through sturdy companions that can offer a bit of structural support.

I love letting their bright magenta trumpets peek through the sturdy golden disks of native Black-eyed Susans, or allowing them to drift lightly above the stiff, upright wands of an ornamental grass. The visual result is so effortless and romantic.

3. Kiss-Me-Over-the-Garden-Gate (Persicaria orientalis)

And if you are looking for a flower with real personality, Kiss-Me-Over-the-Garden-Gate may be exactly what your late-summer garden needs! Many of us gardeners spend years searching for unusual annuals, only to discover that some of the most extraordinary varieties have actually been around for centuries…

This old-fashioned cottage garden favorite grows with astonishing speed from a June sowing, soon forming tall, arching stems covered in masses of dangling pink flower clusters. The effect is soft, graceful, and wonderfully romantic. In fact, when a gentle breeze passes through the garden, the flowers seem to dance above the border!

But there is more! While many annuals stay neat and compact, Kiss-Me-Over-the-Garden-Gate reaches for the sky, often growing 6 feet tall or more in a single season. That makes it perfect for filling empty spaces at the back of borders, softening fences, or creating a colorful screen where the garden needs a little extra height.

The flowers usually begin appearing in late summer and continue well into fall, just when many other plants are starting to tire. Bees absolutely adore the nectar-rich blooms, and butterflies are frequent visitors as well. The long flowering period means your garden stays lively and colorful for weeks on end.

I particularly love combining it with Cosmos, Mexican Sunflower, and ornamental grasses. The airy pink flower chains floating above fiery orange blooms create a breathtaking cottage garden scene. And because it self-seeds quite readily, gardeners in Zones 3 to 11 often find a few welcome seedlings appearing the following spring – a lovely bonus indeed!

4. Spider Flower (Cleome hassleriana)

If you are looking for an unusual and very special vertical accent to sow right now, you are lucky indeed! You may think it is too late to start such a massive annual from seed in June, but it isn’t, really…

Sowing these tiny seeds directly onto your warm, no-dig beds right now is perfectly timed for a late-season explosion, no matter where you garden. Just remember to press them firmly onto the surface; they desperately need sunlight to wake up!

They will rapidly shoot up into towering, stiff stems topped with whopping, airy clusters of vibrant pink, deep violet, and pristine white blossoms. The extraordinarily long, spiky stamens give them an exotic, explosive personality, while the palmate, deep green leaves add a lush, tropical tonality to the border.

And—let’s be honest—it is true that Cleome can get a bit bare at the base as autumn approaches. To hide their long legs, snuggle them at the back of the bed right behind the dense, fiery orange tonalities of late-blooming Marigolds, or let them contrast against the dark, velvety foliage of a purple Coleus.

But there is more! The incredibly long, slender seedpods that dangle beneath the fading blooms are very decorative too, giving a fascinating architectural element to the garden.

5. Mexican Sunflower (Tithonia rotundifolia)

Like most species originating from hotter climates, Mexican Sunflower is extraordinarily exotic looking, and it absolutely thrives when the soil warms up! You may say that June is a bit late to start a massive plant from seed… Well, not for this fiery giant!

In fact, sowing it directly into the hot earth right now is the secret to an incredible late-season explosion.

The whopping, velvety green leaves quickly form a towering, sprawling screen.

And… the blooms! It will bless you with staggering, daisy-like blossoms in the most intense, brilliant orange and scarlet tonalities. It is a magnificent display that injects pure warmth into the garden just as the days begin to shorten. Because it grows so astonishingly fast, we must think about where to position it.

I love to snuggle them at the very back of the bed, letting them arch over lower, cool-toned companions; planting them behind the stiff, silvery-blue wands of Russian Sage creates a jaw dropping contrast!

But there is more! The fading blooms leave behind sturdy seed heads that are very decorative too. Even so, the real magic happens while it flowers—the nectar-rich petals are an absolute magnet for migrating monarch butterflies and little winged visitors of all kinds.

6. Cardinal Flower (Lobelia cardinalis)

Have you ever stared at a soggy, poorly draining depression in your garden and thought it was destined to remain a barren, muddy mess? I can hear you… “Nothing beautiful grows in heavy, wet soil,” you are thinking. But wait!

Sowing Cardinal Flower seeds right now in June transforms that exact problem into an extraordinary, fiery oasis! Unlike many delicate summer blooms that demand perfect drainage, this incredible native treasure actually thrives with wet feet.

As the warm earth wakes these tiny seeds, they quickly push up lush, finely textured leaves that often hide a gorgeous, purplish-bronze tonality on their under sides.

And… the blooms! By late summer, it will explode into towering, stiff stems that carry whopping, spiky racemes of the most intense, brilliant blood-red flowers imaginable. It is an emotional, jaw dropping display!

Because the color is so vibrant, we must ground it thoughtfully; I love to snuggle them right into a soft, delicate underplanting of native ferns, or let their fiery spikes mingle with the cool, silvery blue heads of Great Blue Lobelia. The contrast is magnificent!

7. Cock’s Comb (Celosia cristata)

But wait, can you really grow something so intricate from seed this late in the year? In fact, the scorching heat of June is exactly what these seeds crave to wake up! As the hot soil triggers their growth, they quickly shoot up stiff, upright stems clothed in lush, finely textured, slightly fleshy leaves.

By the time late summer arrives, they will completely transform your beds with jaw dropping, massive floral crests. These dense, velvety heads look exactly like brightly colored sea coral!

They explode in the most intense, fiery crimson, deep burgundy, and brilliant golden tonalities; the classic ‘Toreador’ variety, for instance, is absolutely magnificent.

Because they are so incredibly bold and stiff, you want to contrast them with movement and softness. Weave them through the front of your border alongside the soft, airy plumes of dwarf fountain grass, or let their heavy, waxy crests anchor a bed of delicate, spreading Sweet Alyssum. The visual tension is gorgeous!

On top of that, have you seen the price of high-end dried floral arrangements? You would be mad not to grow them for your winter vases; just cut the stems before they fully mature, and they will keep their rich colors for months!

8. Love-Lies-Bleeding (Amaranthus caudatus)

If you are hunting for a plant that brings genuine drama and a touch of the extraordinary to your garden, look no further. While many summer annuals provide simple, upright color, Love-Lies-Bleeding offers something entirely different: a cascading, architectural spectacle that looks like it stepped straight out of an old-world botanical painting.

Direct-sowing these tiny, dark seeds into warm June soil is essentially a shortcut to high-impact gardening. They germinate quickly once the earth is truly heated, and by late summer, they will send up thick, sturdy stalks that eventually arch under the weight of massive, pendulous tassels.

These rope-like, deep crimson flower clusters can stretch over a foot long, creating a breathtaking, weeping effect that demands attention.

Because of that bold, vertical weight, you have to be intentional with placement. I love to let these crimson “ropes” spill dramatically over the edges of a raised no-dig bed, or weave them into the background of a border where their unusual texture can contrast against the flat, daisy-like faces of Rudbeckia or Echinacea. It adds a layer of sophistication and wild, textural interest that most standard annuals just cannot provide.

9. Zinnia (Zinnia elegans)

Let’s be honest: the garden can start looking a little tired by mid-July. If you’re looking for a jolt of pure, unadulterated electricity to carry your borders straight through to the first frost, you absolutely cannot ignore the humble Zinnia.

You might think these are only for early-spring starters, but there is a brilliant secret to June sowing: when you plant these seeds directly into the sun-drenched, hot earth of your no-dig beds, they germinate with incredible speed and grow into much tougher, more resilient plants than those started indoors.

The architectural presence of a Zinnia is unmistakable—sturdy, upright stems topped with geometric, radiant blooms that seem to defy the heat.

But to really elevate them, you have to move beyond the traditional “flower bed” look. I love using them as a vibrant “filler” in the vegetable patch, or weaving them behind low-growing, silvery-foliage perennials like Artemisia to break up their bold, saturated colors.

If you want a garden that truly supports the local ecosystem, skip the heavy, multi-petaled “pom-pom” varieties and stick to single or semi-double types; those open centers are high-octane fueling stations for migrating monarch butterflies and native bees scrambling to stock up on energy.

10. Cosmos (Cosmos bipinnatus)

To wrap up our list, we have to talk about the absolute ultimate for the late-summer meadow. If you want a plant that defines “effortless, airy elegance,” it’s Cosmos.

You might think these need a long, pampered season to reach their full potential, but June is actually the golden window for direct sowing. Dropping these seeds into the warm, late-spring earth results in a faster, sturdier, and more prolific bloom cycle than starting them indoors ever could.

The architecture here is all about grace. The foliage is finely cut, almost fern-like, which brings a soft, misty quality to the border that balances out the heavier, broader-leaved perennials.

The flowers themselves—floating atop tall, slender stems—are wide, open, and undeniably cheerful. They possess a delicate, dancing quality, swaying with the slightest breeze and injecting a sense of motion into a static border.

Because they grow so tall and wispy, they are the perfect candidates for “weaving.” I love tucking them in between heavier, more rigid plants; they act as a beautiful, softening buffer between your bolder focal points like Sunflowers or Zinnias.

And for the sake of the local wildlife, keep an eye out for single-flowered, heirloom varieties like ‘Sensation’ or ‘Psyche’. The pollinators can easily access the nectar in these open-faced varieties, and you’ll find your garden buzzing with hoverflies, native bees, and butterflies well into the first frost.