How to Grow Foxglove
Digitalis purpurea
Foxglove stands as a striking biennial that captivates gardens with its tall spikes of tubular blooms. Gardeners prize this plant for its ability to thrive in partial shade while adding vertical interest and nectar sources for pollinators.
📷 Wikipedia: Digitalis purpureaStarting Foxglove: indoors or direct sow?
🏠 Start indoors 4 weeks before your last spring frost, then move the seedlings outside.
If starting indoors, move sturdy seedlings outdoors once all danger of frost has passed and they are hardened off.
Soil, care & harvest
Prepare well-drained soil with a pH between 5.5 and 6.5, as Foxglove prefers slightly acidic conditions. Since it is a biennial cool-season crop, sow seeds directly outdoors or start indoors 2 to 6 weeks before your last frost date. Press seeds into the soil surface without covering them deeply, then keep moist until they sprout in 14 to 21 days.
Space plants 12 to 18 inches apart to ensure good air circulation around their tall stems. While Foxglove does not require trellising, its height of up to five feet may need support if planted near delicate neighbors. Water moderately when the soil feels dry and apply a light mulch to retain moisture. Feed sparingly with balanced fertilizer only if growth appears sluggish.
Watch for powdery mildew, which you can prevent by ensuring good airflow and avoiding overhead watering. Snails and slugs often target the tender foliage; use organic barriers or bait to control them. As a biennial, do not harvest flowers in year one. In the second season, cut flowering stems back after blooming finishes to encourage seed formation if desired.
When to Plant Foxglove
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 | — |
