9 Red Flowers To Plant In Your Pennsylvania Garden In 2026
Red flowers have a way of catching the eye faster than almost anything else in the garden. Their bold color stands out against green leaves and instantly adds energy to flower beds, borders, and containers.
In Pennsylvania gardens, these vibrant blooms can create a striking display from spring through late summer.
Many gardeners love using red flowers to bring warmth and contrast to their outdoor spaces. A few well placed plants can brighten a quiet corner, highlight a pathway, or turn an ordinary garden bed into a lively focal point.
Even on cloudy days, those deep crimson and scarlet tones seem to glow among the greenery.
Pennsylvania’s changing seasons also give gardeners the chance to enjoy a wide variety of red blooms. Some thrive in cool spring weather, while others shine during the hotter months of summer.
By choosing the right plants, you can keep that rich splash of color appearing throughout the growing season and create a garden that always feels full of life.
1. Cardinal Flower (Lobelia Cardinalis)
Few plants stop people in their tracks quite like the Cardinal Flower. Its tall, blazing red spikes look almost too vivid to be real, and hummingbirds absolutely love them.
If you have ever wanted to attract more hummingbirds to your Pennsylvania garden, this is one of the best plants you can grow.
Cardinal Flower is a native perennial, which means it naturally belongs in Pennsylvania’s landscape.
It blooms from late summer into early fall, filling the garden with color just when many other flowers start to fade. It grows best in moist soil and can handle both full sun and partial shade.
Plant it near a rain garden, a pond edge, or any spot in your yard that stays a little wet. It reaches about two to four feet tall, so it works well as a backdrop in garden beds.
Once established, it spreads on its own by self-seeding, so you will often see new plants popping up nearby each year. This flower is also incredibly tough. Pennsylvania winters do not bother it much at all.
With just a little care, Cardinal Flower will reward you with stunning blooms season after season, making it a true garden treasure.
2. Bee Balm (Monarda Didyma)
Bee Balm is one of those plants that makes your garden feel alive. The bold, shaggy red blooms are a magnet for bees, butterflies, and hummingbirds all at once.
On a warm summer afternoon in Pennsylvania, a patch of Bee Balm can look like a tiny wildlife party.
This native perennial thrives in full sun to partial shade and prefers moist, well-drained soil. It blooms from mid-summer to early fall, giving you weeks of rich red color. The flowers have a unique, spiky shape that really stands out in any garden bed or border.
One thing to keep in mind is that Bee Balm can spread quickly. Giving it enough space and dividing clumps every few years keeps it looking its best.
Good air circulation also helps prevent powdery mildew, which can sometimes be an issue in humid Pennsylvania summers.
Beyond its looks, Bee Balm has a pleasant minty fragrance. The leaves can even be used to make herbal tea, which is a fun bonus.
Whether you plant it in a pollinator garden or a traditional flower bed, Bee Balm brings both beauty and buzzing life to your outdoor space.
3. Scarlet Sage (Salvia Coccinea)
Scarlet Sage is a heat-loving annual that earns its spot in any Pennsylvania garden. From early summer all the way through fall, it produces non-stop spikes of vivid red flowers that pollinators simply cannot resist.
If you want continuous color without much fuss, this plant delivers.
Unlike some annuals that slow down in the hottest part of summer, Scarlet Sage actually thrives in the heat. It grows well in full sun and tolerates dry conditions better than many other flowering plants.
That makes it a smart choice for raised beds, garden borders, or sunny spots that tend to dry out quickly.
Growing Scarlet Sage from seed is easy and affordable. You can start seeds indoors about six to eight weeks before the last frost in Pennsylvania, then transplant seedlings outside once the weather warms up.
Plants typically reach one to two feet tall and look great when planted in groups.
Hummingbirds are especially drawn to the tubular red flowers, and butterflies visit them often too. Because it reseeds itself, you might even find new plants coming back the following year.
Scarlet Sage is a low-effort, high-reward flower that fits beautifully into both formal and casual Pennsylvania garden designs.
4. Red Zinnias (Zinnia Elegans)
Zinnias are the cheerful workhorses of the summer garden, and red varieties are among the most eye-catching of all.
They bloom from early summer until the first frost, giving Pennsylvania gardeners months of bold color with very little effort. If you are new to gardening, Zinnias are one of the easiest flowers you can grow.
Just sow seeds directly into the ground after the last frost date in Pennsylvania, usually around mid-May. They sprout quickly and start blooming within weeks.
Full sun and well-drained soil are all they really need to perform well. The more you cut them, the more flowers they produce, so do not be shy about bringing bouquets indoors.
Red Zinnias are also fantastic for attracting butterflies. Monarchs, swallowtails, and many other species love landing on the wide, flat blooms.
Planting a row of red Zinnias along a garden path or fence creates a stunning visual display that lasts all season long.
They come in many sizes, from compact dwarf varieties to tall cutting types that can reach three feet. Did you know Zinnias were one of the first flowers grown in space?
NASA astronauts grew them on the International Space Station. That fun fact alone makes them worth planting in your Pennsylvania garden.
5. Red Geraniums (Pelargonium Spp.)
Walk through almost any neighborhood in Pennsylvania during summer, and you will spot red Geraniums brightening up porches, patios, and window boxes.
There is a reason they have been a garden favorite for generations. Their rich red blooms are bold, long-lasting, and surprisingly easy to maintain.
Technically tender perennials, Geraniums are grown as annuals in Pennsylvania since they cannot handle hard winter freezes. They thrive in full sun and prefer well-drained soil.
Container planting works especially well because you can move them indoors before the first frost and keep them going through the winter months.
Watering Geraniums correctly makes a big difference. They like to dry out a bit between waterings, so avoid overwatering to keep the roots healthy.
Deadheading spent blooms regularly encourages the plant to keep producing fresh flowers throughout the season.
One underrated quality of red Geraniums is their mild fragrance, which some people find pleasant and others use as a natural insect deterrent. They also come in trailing varieties perfect for hanging baskets.
Whether you are sprucing up a small balcony in Philadelphia or decorating a wide front porch in rural Pennsylvania, red Geraniums add instant charm and curb appeal to any setting.
6. Red Petunias (Petunia Spp.)
Red Petunias are one of the most versatile flowering plants you can add to your Pennsylvania garden. They bloom continuously from spring all the way through fall, making them one of the longest-performing annuals available.
Whether tucked into garden beds, spilling out of hanging baskets, or filling window boxes, they never disappoint.
Petunias love full sun and warm temperatures, which Pennsylvania summers provide in abundance.
They grow best in well-drained soil and benefit from regular fertilizing every couple of weeks to keep the blooms coming strong. Pinching back leggy stems mid-season encourages fresh, bushy growth and more flowers.
There are several types to choose from. Grandiflora varieties have large, showy blooms, while Multiflora types produce smaller but more abundant flowers.
Wave Petunias are a spreading type that works beautifully as ground cover or in wide containers. All of them come in a rich, true red that really pops against green foliage.
Petunias also attract hummingbirds and some butterfly species, adding even more life to your garden. They are widely available at garden centers across Pennsylvania each spring, and they are very affordable.
For a reliable, colorful, and low-maintenance red flower, Petunias are hard to beat in any Pennsylvania landscape.
7. Red Tulips (Tulipa Spp.)
Nothing signals the arrival of spring in Pennsylvania quite like a field of red Tulips. Their bold, cup-shaped blooms emerge in early spring when the rest of the garden is just waking up, making them one of the most anticipated flowers of the year.
Planting red Tulips is like giving your future self a gift. Tulip bulbs need to be planted in the fall, ideally between October and early November in Pennsylvania.
They require a cold winter dormancy period to bloom properly, and Pennsylvania’s climate is perfectly suited for this.
Choose a spot with full sun and well-drained soil to prevent bulb rot over the winter months.
Plant bulbs about six inches deep and six inches apart for a full, lush look. Mixing early, mid, and late-blooming varieties extends your red Tulip display across several weeks in spring.
After blooming, allow the foliage to turn yellow naturally before removing it, as this helps the bulb store energy for the following year.
Red Tulips pair beautifully with yellow Daffodils or white Hyacinths for a classic spring color scheme.
They work well in garden beds, along walkways, and even in large containers on patios. For Pennsylvania gardeners who love bold spring color, red Tulips are an absolute must.
8. Red Daylilies (Hemerocallis Spp.)
Daylilies have earned a loyal following among Pennsylvania gardeners for good reason. They are tough, adaptable, and produce gorgeous blooms without demanding a lot of attention.
Red varieties, in particular, bring a fiery pop of color to summer gardens that is hard to match with any other perennial.
Each individual Daylily flower lasts only one day, which is how they got their name. But do not let that fool you.
Each plant produces dozens of buds on multiple stems, so the blooming display continues for several weeks during the summer. Some rebloom varieties even produce a second flush of flowers later in the season.
Daylilies are incredibly flexible when it comes to growing conditions. They tolerate clay soil, sandy soil, full sun, and partial shade.
Once established in a Pennsylvania garden, they need very little watering and can handle summer heat without much fuss. Dividing clumps every few years keeps plants vigorous and encourages more blooms.
Red Daylily varieties like ‘Anzac,’ ‘Chicago Apache,’ and ‘Pardon Me’ are popular choices that perform well across Pennsylvania. They look stunning planted in large sweeping groups along fences, driveways, or hillsides.
For a low-maintenance perennial that brings reliable summer color year after year, red Daylilies are a top pick.
9. Red Knock Out Roses (Rosa Spp.)
Knock Out Roses changed the game for rose lovers across Pennsylvania. Before they came along, growing roses meant dealing with pests, diseases, and constant upkeep.
Knock Out Roses threw all of that out the window. They are tough, disease-resistant, and bloom almost non-stop from late spring until the first hard frost.
The red variety produces clusters of rich, cherry-red blooms that cover the entire bush. Plants grow three to four feet tall and wide, making them ideal for garden borders, foundation plantings, or standalone specimen shrubs.
They look polished and full without requiring the fussy care that traditional roses demand. Full sun is key for the best performance. Plant them in a spot that gets at least six hours of direct sunlight each day.
They prefer well-drained soil and benefit from a slow-release fertilizer applied in spring. Pruning in early spring, just as new growth begins, keeps the shape tidy and encourages vigorous blooming.
One of the best things about Knock Out Roses in Pennsylvania is their cold hardiness. They handle the state’s winters well and bounce back strong each spring.
Deer can occasionally browse on them, but they recover quickly. For a showstopping, reliable red flower that blooms all season, Knock Out Roses belong in every Pennsylvania garden.
