Yes, planting flowers in summer works well when you pick heat-tolerant varieties and give them extra water. You can fill gaps in your beds, add fall color, or start a new garden in July or August. Summer planting takes more care than spring but still produces great flowers.
In my experience adding flowers every August keeps color going strong into fall. Last year I tested putting in a dozen vincas and six lantanas during a brutal heat wave. They looked wilted for three days but bounced back once their roots found moisture in the soil. By September they were blooming like crazy and looked better than my spring plants.
My neighbor tried summer flower planting with impatiens one July and lost every single plant. She learned that some flowers just cannot handle the heat stress. The vincas I planted right next to her bed thrived because they were bred for hot weather.
Summer planting succeeds when you work around the heat instead of fighting it. Your transplants stress out when hot sun hits their leaves before roots can pull water fast enough. You need to time your planting and watering to give your new flowers their best chance at survival.
Your best choices for what flowers to plant in summer include vinca, lantana, pentas, and portulaca. These heat lovers handle hot weather without wilting. Container perennials work too since they already have strong roots. Fall mums and grasses also transplant well in summer heat.
Best Planting Time
- Evening advantage: Plant after 5 PM when temps drop and your flowers have all night to settle in before hot sun returns.
- Cloudy days: Overcast weather gives you a perfect planting window since your transplants avoid direct sun stress.
- Morning backup: If you must plant in morning, finish by 9 AM before heat builds up.
Watering Requirements
- First two weeks: Your new flowers need water every single day until roots spread into surrounding soil.
- Deep soaking: Give each plant a slow drink that wets soil six to eight inches down not just the surface.
- Morning timing: Water before 10 AM so leaves dry before evening and roots have moisture for hot afternoon.
Root Protection
- Mulch layer: Spread two to three inches of shredded bark around your plants to keep roots cool and moist.
- Light color: Choose lighter mulch colors that reflect heat rather than dark mulch that absorbs it.
- Keep dry zone: Leave a small gap between mulch and stems to prevent rot at the crown.
When I first started summer planting I made plenty of mistakes before finding what works. Now my routine starts with digging the hole twice as wide as the rootball. I fill the hole with water and let it drain before setting the plant. This gives roots a moisture reserve that helps them survive the first critical days of heat stress.
You can extend summer planting later into the season than you might think. I have planted perennials in September with good results. They root in during fall while temps cool down then come back strong the following spring. Knowing what flowers to plant in summer opens up a whole second planting season for your garden.
Read the full article: When to Plant Flowers: Month-by-Month Guide
