8 Summer Flowers I’m Planting in May Instead of Petunias This Year
Want summer containers and flower beds that still look colorful by late August without constant trimming, watering, and replacing tired plants?
May is usually when garden centers overflow with petunias, but more gardeners are starting to replace them with flowers that bloom longer, tolerate heat better, and stay fuller through the hottest stretch of summer.
Some spill beautifully over raised beds and containers. Others thrive in intense sun while continuing to bloom deep into late summer without looking exhausted halfway through the season.
These are the summer flowers I’m planting in May instead of petunias this year, especially for landscapes and containers that need strong color with less maintenance once summer heat arrives.
Calibrachoa That Gives the Full Petunia Look Without Constant Deadheading
Best for Zones 9–11 as a perennial, grown as an annual in cooler zones
Calibrachoa is probably the closest true replacement for petunias. The flowers create the same overflowing effect people love in hanging baskets and containers, but the plants usually stay denser and cleaner through summer heat.
By planting them in May, they establish quickly before temperatures peak. The blooms also self-clean, which means less deadheading and fewer faded flowers sitting on the plant by midsummer.
Lantana That Keeps Blooming Through Extreme Summer Heat
Best for Zones 8–11 as a perennial, annual in colder climates
Lantana is one of the few summer flowers that actually looks happier once the hottest weather arrives. While some annuals slow down in July and August, lantana continues producing flower clusters through heat and drought.
The colors also intensify in strong sun, especially oranges, yellows, pinks, and coral blends. Butterflies constantly gather around the blooms, which makes the entire garden feel more active and alive.
Verbena That Spreads Naturally Across Beds and Containers
Best for Zones 7–11 depending on variety
Verbena creates softer movement than traditional petunias. Instead of dense flower mounds, the stems spread naturally across borders, retaining walls, and raised beds, helping planting areas feel more layered and relaxed.
Planting in May gives the roots enough time to establish before peak summer arrives. Once settled, the flowers continue blooming well into late summer with surprisingly little maintenance.
Scaevola That Cascades Beautifully Without Looking Messy
Best for Zones 10–11 as a perennial, grown as an annual elsewhere
Scaevola handles heat far better than most trailing annuals. The fan-shaped flowers spill evenly over containers and hanging baskets without developing the tangled, stretched appearance petunias sometimes get by late summer.
It also keeps flowering consistently during long hot stretches, especially when planted in full sun during late spring.
Angelonia That Stays Upright All Summer Long
Best for Zones 9–11 as a perennial, annual in cooler regions
Angelonia brings vertical structure into summer planting beds while continuing to bloom through intense heat. Unlike flowers that become floppy or leggy by August, the flower spikes stay clean and upright for months.
That shape makes containers and landscape borders feel more balanced, especially when mixed with trailing plants or ornamental grasses.
Pentas That Keep Pollinators Moving Through the Garden
Best for Zones 10–11 as a perennial, annual in Zones 3–9
Pentas thrive once temperatures rise, which makes May the ideal planting time. The star-shaped flower clusters continue blooming through summer while attracting butterflies and bees almost nonstop.
The plant also holds its shape well in landscape beds, making it useful for gardeners who want consistent color without constant trimming.
Cuphea That Blooms Continuously Through Late Summer
Best for Zones 9–11 as a perennial, annual elsewhere
Cuphea is one of the most underrated heat-tolerant summer flowers. Once planted in warm May soil, it keeps flowering steadily through summer without needing much attention.
The smaller blooms create softer texture than petunias, but the nonstop flowering makes containers and borders feel full for months.
Moss Rose That Thrives in Hot, Dry Backyard Conditions
Best for Zones 2–11 as a summer annual
Moss rose, also called portulaca, is perfect for areas where petunias struggle in extreme sun. The succulent-like foliage stores moisture, helping the plant continue blooming during hot dry weather that quickly exhausts other annuals.
The flowers open fully in direct sunlight and create bright color across rock gardens, edging, gravel beds, and raised planters deep into late summer.
Petunias will probably always have a place in summer containers, but these alternatives often handle heat, drought, and late-summer fatigue much better once the hottest part of the season arrives. Some spill more naturally, some bloom longer, and others bring stronger texture and pollinator activity into the garden without needing constant maintenance to stay attractive.
The biggest difference is that many of these flowers keep looking fresh well past midsummer, especially when planted in May and given enough time to establish before extreme heat sets in.
Which one would you plant instead of petunias this year?