How to Grow Impatiens
Impatiens walleriana
Impatiens walleriana is a vibrant warm-season annual beloved for its continuous blooming in partial to full shade. Gardeners prize these easy-to-grow plants for their colorful flowers that thrive when other species struggle, making them perfect for container gardens or shaded borders.
📷 Wikipedia: Impatiens wallerianaStarting Impatiens: indoors or direct sow?
🌾 Sow directly in the garden — Impatiens is not usually started indoors.
Start seeds indoors six to eight weeks before your last expected frost date, then transplant seedlings outdoors once all danger of frost has passed and soil is warm.
Soil, care & harvest
Prepare moist, well-draining soil with a pH between 5.5 and 6.5 before sowing seeds indoors six to eight weeks before your last frost date. Press the tiny seeds gently onto the surface without covering them, as they need light to germinate. Expect sprouts in seven to twenty-one days under warm conditions.
Space plants eight to twelve inches apart to encourage bushy growth and airflow. Water regularly since these flowers have moderate to high moisture needs, keeping the soil consistently damp but not soggy. Apply a light layer of mulch around the base to retain moisture and feed with a balanced liquid fertilizer every few weeks during the growing season.
Watch for aphids and powdery mildew; prevent issues by ensuring good air circulation and avoiding overhead watering. Since Impatiens walleriana is an annual flower rather than a vegetable, it does not produce harvestable crops. Instead, enjoy the display of blooms throughout the warm season until frost arrives to end the growing cycle.
When to Plant Impatiens
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | May – June | July – September | — |
| Zone 2 | April – May | June – August | — |
| Zone 3 | April – May | June – August | — |
| Zone 4 | March – April | June – July | — |
| Zone 5 | March – April | May – July | — |
| Zone 6 | March – April | May – July | — |
| Zone 7 | February – March | April – June | — |
| Zone 8 | February – March | April – June | — |
| Zone 9 | January – February | March – May | — |
| Zone 10 | January | February – April | — |
| Zone 11 | January | January – March | — |
| Zone 12 | January | January – March | — |
| Zone 13 | January | January – March | — |
