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Nasturtiums are vibrant, easy-to-grow annuals that add a splash of color to any garden. If you live in Zone 5, with its cold winters and moderate growing season, growing hearty nasturtiums requires some specific tips. Here’s how to ensure your nasturtiums thrive and bloom beautifully all season long.
Choosing the Right Varieties
Select varieties that are known for their hardiness and vigorous growth. Some popular options for Zone 5 include ‘Jewel of Africa’, ‘Empress of India’, and ‘Alaska’. These varieties tend to produce abundant blooms and can withstand cooler temperatures better than more delicate types.
Planting Timing and Site Selection
Plant nasturtiums after the last frost date, typically in late April or early May. Choose a location with full sun to partial shade. Well-drained soil is essential, as nasturtiums dislike soggy roots. If your soil is heavy clay, amend it with compost or organic matter to improve drainage.
Starting Seeds Indoors
For an earlier bloom, start seeds indoors 4-6 weeks before the last expected frost. Use seed-starting trays with moist potting mix. Keep the seedlings in a warm, bright location. Transplant outdoors once seedlings have developed several true leaves and the weather is consistently warm.
Plant Care and Maintenance
Water nasturtiums regularly, especially during dry spells. Keep the soil evenly moist but not waterlogged. Mulching around the plants helps retain moisture and suppress weeds. Fertilize sparingly; nasturtiums prefer lean soil and can suffer from excessive fertilization that promotes leafy growth over flowers.
Supporting and Training
If growing nasturtiums on a trellis or fence, provide support early to encourage climbing. Otherwise, they will spread as ground cover or spill over containers. Regularly pinch back leggy growth to promote bushier plants and more blooms.
Overwintering and Extending the Season
In Zone 5, nasturtiums are annuals, but you can extend their season by bringing potted plants indoors before the first frost. Keep them in a bright, cool location and water sparingly. Alternatively, collect seeds at the end of the season to plant anew next year.
Seed Saving Tips
Allow some flowers to go to seed. Once the seed pods turn brown and dry, harvest the seeds and store them in a cool, dry place. Label the seeds with the variety and planting date for future use.
Common Problems and Solutions
- Aphids: Use insecticidal soap or neem oil to control infestations.
- Powdery mildew: Improve air circulation and avoid overhead watering.
- Leggy growth: Ensure adequate sunlight and pinch back to encourage bushiness.
With proper planning and care, nasturtiums can be a vibrant and resilient addition to your Zone 5 garden. Their colorful blooms and edible leaves make them a favorite for gardeners seeking beauty and utility in one package.