Sunlight: Full sun to partial shade
Maturity: 55-75 days from seed to flower
Height: 10 to 18 inches
Spacing: 8 to 18 inches apart in all directions
Flower gardeners are growing petunias for their dazzling colors and abundant blooms that continue from early spring until frost. Available in hundreds of varieties, petunias are one of the most popular flowering annuals and are well suited for use in borders, baskets and containers.
Native to South America, the first petunia specimen (Petunia multiflora) was discovered at the mouth of the Rio de la Plata and was white in color. The original plants were hardy, had trailing 2-3 inch stems and incredible scents. These scents have been lost in many of the modern-day hybrid varieties. Fortunately, many of the old fashioned heirloom varieties are still available to fill the air with their amazing fragrance.
These versatile plants grow 10-18 inches tall and may volunteer in your garden the following years since they are a self-seeding annual.
Tired of the same old flowers? Heirloom seeds — the ones that Grandma used to grow — add charm to your garden while stirring memories with their abundant blossoms and arousing scents. Best of all, we ship them FREE!
- Very easy to grow in a dizzying range of colors
- Choose seedlings or start from seed 8-10 weeks before last frost
- Choose a site in full sun with amended soil or in quality potting soil
- Plant or hang outside after danger of frost has passed
- Pests and diseases are not common, but aphids, flea beetles and slugs may attack stressed plants
Petunias require full sunlight to thrive, but will tolerate some shade. The more shade they receive, the fewer flowers they will produce.
Soil should be average to rich and well-drained. Prior to planting, work a shovelful or two of organic matter, such as compost or well-aged manure, into the soil (watch our video Flower Gardening from the Ground Up). This helps condition the soil, which improves drainage and will also increase the ability of lighter soils to hold water and nutrients.
How to Plant
Petunias may be grown from seeds or seedlings. If growing from seeds, sow indoors on the surface of the soil 8-10 weeks prior to last frost (see Starting Annual Flowers Indoors to learn more). Pinch off the top inch before planting to encourage good branching and transplant when the danger of frost has past.
For good ground cover, space plants 12-18 inches apart. Fertilize monthly with a liquid organic fertilizer to promote healthy growth and remove spent flowers on a regular basis to extend the blooming period.
Insects and Disease
Petunias do not have many insect or disease problems. Watch for aphids, flea beetles and slugs, which can occasionally attack plants, and take the following common sense, least-toxic approach, if found:
- Remove weeds and other garden debris to eliminate alternate hosts.
- Discard severely infested plants by securely bagging and putting in the trash.
- Release commercially available beneficial insects to attack and destroy insect pests.
- Spot treat pest problem areas with diatomaceous earth and neem oil.
- Scatter Sluggo®, an organic iron phosphate bait, around plants to kill slugs.
To prevent or reduce plant diseases, many of which are characterized by wilting, spots and rotted tissue, we recommend the following:
- Avoid overhead watering whenever possible (use soaker hoses or drip irrigation)
- Properly space plants to improve air circulation
- Apply copper spray or sulfur dust to prevent further infection
Seed Saving Instructions
Petunias are self-seeding. You can save the seed if you’re interested, but the flowers won’t always come true to type. They usually revert to a mix of small white, lavender and rose flowers.