8 Flowers Worth Planting In Pennsylvania Pots This May
Why settle for boring pots when May in Pennsylvania gives you the perfect conditions to create container displays that actually stop people in their tracks?
This is the month when the nurseries are fully stocked, the temperatures are cooperative, and the growing conditions are ideal for getting flowers established in containers before the real heat of summer arrives and starts sorting the survivors from everything else.
Container flowers in Pennsylvania live or die by the choices made in May. Get it right and you’re looking at pots that stay full, colorful, and genuinely impressive from now straight through the first frost.
Get it wrong and you spend the summer replacing plants that couldn’t handle the heat trapped in those containers on a sunny patio or porch.
The flowers on this list are specifically worth putting in Pennsylvania pots this month – reliable performers that reward the effort with continuous color through the longest, hottest stretch of the growing season.
1. Petunia
Few flowers put on a show quite like petunias do. Walk through any Pennsylvania garden center in May and you will find them everywhere, and for good reason.
Petunias are one of the most reliable container flowers you can grow, and they bloom heavily from spring all the way through the end of summer.
Pennsylvania summers can get hot and humid, especially in July and August. Petunias actually handle that warmth well when grown in containers with good drainage. Just make sure your pot has holes in the bottom so water does not sit and cause root rot.
Petunias love full sun, so place your pot somewhere that gets at least six hours of direct sunlight each day. Water them regularly, especially during dry spells. They can dry out fast in containers.
Deadheading, which means pinching off old blooms, keeps the plant producing new flowers. If your petunia starts looking leggy in midsummer, trim it back by about half. It will bounce back quickly with fresh growth and new blooms.
You can find petunias in dozens of colors, from deep purple and hot pink to soft white and coral. Mix a few shades together in one large pot for a bold, eye-catching display. They are easy to grow, affordable, and absolutely stunning all season long.
2. Geranium
Geraniums have been a favorite porch flower for generations, and there is a very good reason for that. They are tough, colorful, and surprisingly easy to care for.
If you are new to container gardening in Pennsylvania, geraniums are one of the smartest first choices you can make this May.
One thing that makes geraniums stand out is how well they handle changing weather. Spring in Pennsylvania can be unpredictable, with warm days followed by cool nights. Geraniums take those swings in stride and keep on blooming without much fuss.
They do best in full sun but can tolerate a little afternoon shade, especially during the hottest weeks of summer.
Plant them in well-draining potting mix and water them when the top inch of soil feels dry. Overwatering is the most common mistake people make with geraniums.
The blooms come in classic shades like red, pink, salmon, and white. Some varieties also have beautifully patterned leaves that add extra interest even when the flowers are not at their peak. Geraniums are also known for their long bloom season.
With regular deadheading and a light fertilizer every two weeks, your geraniums will keep producing fresh clusters of color from May through the first cool nights of fall. Few container flowers offer that kind of staying power.
3. Calibrachoa
Calibrachoa goes by a nickname that says it all: million bells. Look at a healthy plant in full bloom and you will understand why.
It produces hundreds of tiny, trumpet-shaped flowers that spill beautifully over the sides of any container, hanging basket, or window box.
This flower has become a staple in Pennsylvania container gardens because it blooms nonstop from spring through fall without needing much deadheading. The flowers drop off on their own and new ones keep coming.
That makes it one of the lowest-maintenance options on this list. Calibrachoa loves sunshine. Give it a spot with at least six hours of direct light each day and it will reward you with constant color.
It does need regular watering, though, because it can dry out quickly in warm weather. Feed it with a liquid fertilizer every week or two to keep the blooms coming strong.
The color range is impressive. You can find calibrachoa in yellow, pink, red, purple, orange, and even bi-colored varieties.
Try pairing it with taller plants in the center of a pot and letting the calibrachoa trail over the edges for a layered, professional look.
In Pennsylvania, plant calibrachoa after the last frost date in your area, which is usually around mid-May. Once it gets going, it will be one of the hardest-working flowers in your whole garden.
4. Marigold
Marigolds are one of those classic flowers that never go out of style. Gardeners across Pennsylvania have been growing them in pots for decades, and they remain a top pick every single May.
Bold, sunny, and surprisingly tough, marigolds bring a cheerful energy to any outdoor space.
One of the coolest things about marigolds is how they attract pollinators. Bees and butterflies love them, which is great news if you also grow vegetables or herbs nearby.
Planting a pot of marigolds on your patio can actually help your whole garden thrive by bringing in helpful insects.
Marigolds thrive in full sun. The more sunlight they get, the more flowers they produce. They are also fairly drought-tolerant once established, which makes them a smart choice for busy gardeners who do not always have time to water every day.
When planting marigolds in containers, choose a pot that is at least eight inches deep. Use a well-draining potting mix and make sure the container has drainage holes.
Deadhead spent blooms regularly to keep the plant focused on producing new flowers instead of setting seed.
In Pennsylvania, May is the ideal time to get marigolds into pots. The weather is warming up, the sun is strong, and these flowers will have the whole summer to grow and bloom. By midsummer, a well-tended marigold pot will be absolutely packed with color.
5. Begonia
Not every porch in Pennsylvania gets wall-to-wall sunshine, and that is perfectly fine when you have begonias. These flowers were practically made for shaded patios and covered porches.
They bloom reliably in low-light conditions where many other flowers simply refuse to perform.
Wax begonias are the most popular type for containers. They have thick, waxy leaves that hold moisture well and small but cheerful flowers in shades of red, pink, white, and coral.
Tuberous begonias are another option and produce much larger blooms with a more dramatic look.
Begonias prefer bright, indirect light or dappled shade. Morning sun with afternoon shade is the sweet spot for most varieties.
Too much direct afternoon sun can scorch the leaves, especially during Pennsylvania’s hottest summer weeks.
Water begonias carefully. They like moist soil but do not do well when sitting in soggy conditions.
Let the top of the soil dry out slightly between waterings. Using a pot with good drainage is essential for keeping begonias healthy all season.
One of the best things about growing begonias in Pennsylvania is that they handle the transition from spring to summer smoothly.
Plant them in May once nighttime temperatures stay above 50 degrees and they will reward you with months of steady, reliable color on your porch or patio without asking for much in return.
6. Lantana
If you want butterflies visiting your patio all summer long, lantana is the flower to plant. It produces clusters of tiny blooms in bold, multicolored combinations that butterflies simply cannot resist.
A single pot of lantana in full bloom is like a butterfly magnet sitting right outside your door.
Lantana is a warm-weather lover through and through. May is the perfect time to get it started in Pennsylvania because the temperatures are climbing and the days are getting longer.
Once the heat of summer arrives, lantana really hits its stride and produces wave after wave of color.
Full sun is a must for lantana. Give it at least six to eight hours of direct sunlight each day and it will thrive.
It is also surprisingly drought-tolerant, making it a great pick for gardeners who sometimes forget to water. That said, regular watering during dry stretches will keep it blooming at its best.
Lantana comes in a wide range of color combinations, including orange and yellow, pink and white, red and orange, and purple. Many varieties change color as the blooms age, which gives the plant a naturally multicolored, dynamic look throughout the season.
In Pennsylvania, lantana is grown as an annual since it is not cold-hardy. But the good news is that it grows fast, blooms heavily, and fills a container beautifully from May all the way through the first frost. It is absolutely worth planting every single year.
7. Zinnia
Speed is one of zinnia’s greatest qualities. From seed to bloom, zinnias move fast. If you start them in a container in early May in Pennsylvania, you could be enjoying full, bright flowers within just a few weeks. That kind of quick payoff is hard to beat.
Zinnias come in an incredible range of colors, including red, orange, yellow, pink, purple, and white. Some varieties even have bi-colored or striped petals.
The blooms are large and bold, making them one of the most eye-catching flowers you can grow in a pot on your porch or patio.
These flowers need full sun to perform at their best. Choose a spot that gets six or more hours of direct sunlight each day.
Zinnias also prefer warm soil, which is why May is such a good time to plant them in Pennsylvania. The soil in your containers will warm up quickly in the spring sunshine.
Water zinnias at the base of the plant rather than overhead. Wet leaves can lead to powdery mildew, which is a common issue with zinnias.
Good airflow around the plant also helps prevent this problem, so avoid overcrowding your container.
Deadhead spent blooms regularly to encourage continuous flowering. The more you remove old flowers, the more new ones the plant will produce.
Zinnias are generous bloomers by nature, and with a little attention, they will keep your Pennsylvania pots looking vibrant all summer long.
8. Sweet Alyssum
Walk past a pot of sweet alyssum on a warm May evening in Pennsylvania and you will stop in your tracks. The fragrance is soft, sweet, and a little bit like honey. It is one of those unexpected pleasures that makes container gardening so rewarding.
Sweet alyssum is a compact, low-growing flower that works beautifully as a filler in mixed containers. Tuck it around the edges of a pot with taller plants in the center and it will spill softly over the sides, creating a lush, layered look.
It is also lovely on its own in a small window box or hanging basket. This flower prefers cool to moderate temperatures, which makes May an ideal time to plant it in Pennsylvania.
It can tolerate light frost and tends to slow down a bit during the hottest weeks of summer, but it often rebounds nicely when temperatures cool again in late August.
Sweet alyssum grows best in full sun to partial shade. It is not a heavy feeder, so a light application of balanced fertilizer once a month is plenty.
Keep the soil evenly moist but not soggy for the healthiest plants. The tiny flowers come in white, pink, purple, and lavender. White varieties are the most fragrant.
Plant a few clusters near your front door or sitting area so you can enjoy the gentle scent every time you step outside. It is a small flower that makes a surprisingly big impression.
