Annual Flower

When to Plant Nasturtiums in Delaware

Edible flowers that double as pest traps. Plant near vegetables to lure aphids away from your food crops.

The Short Answer

In Delaware, plant nasturtiums based on your regional frost dates. Northern Delaware has a last frost around Apr 10 - Apr 25, while Southern Delaware sees frost end around Apr 1 - Apr 15. Moderate climate with maritime influence. Good growing conditions for a wide range of vegetables.

Delaware Frost Dates

Your planting dates depend on which part of Delaware you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Delaware 7a Apr 10 - Apr 25 Oct 10 - Oct 25
Southern Delaware 7b Apr 1 - Apr 15 Oct 20 - Nov 5

Nasturtiums Planting Schedule for Delaware

Northern Delaware (Zones 7a)

Average last frost: Apr 10 - Apr 25 · Average first frost: Oct 10 - Oct 25

Start Seeds Indoors
2 wks before frost
Transplant Outside
1 wks after frost
Direct Sow
1 wks after frost

Southern Delaware (Zones 7b)

Average last frost: Apr 1 - Apr 15 · Average first frost: Oct 20 - Nov 5

Start Seeds Indoors
2 wks before frost
Transplant Outside
1 wks after frost
Direct Sow
1 wks after frost

Growing Nasturtiums in Delaware

Nasturtiums in Delaware's Climate

Nasturtiums thrive from spring through frost in your climate. They prefer poor soil — don't fertilize or you'll get leaves without flowers. The trailing types spill beautifully from containers. Plant near tomatoes and squash to draw aphids away from your vegetable crops.

Soil Considerations for Delaware

Sandy soils in south, clay loam in north. Generally well-drained. Slightly acidic. Make sure soil has warmed to at least 55°F before planting nasturtiums outside.

Delaware Climate & Growing Season

Moderate climate with maritime influence. Good growing conditions for a wide range of vegetables. Nasturtiums cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.

Growing season length varies across Delaware: Northern Delaware (7a) has a last frost around Apr 10 - Apr 25, while Southern Delaware (7b) sees frost end around Apr 1 - Apr 15. This difference matters for nasturtiums — transplant timing shifts by several weeks across the state.

Growing Tips

Both flowers and young leaves are edible with a peppery taste. Thrives in poor soil — too much nitrogen means all leaves, no flowers.

Companion Planting

Plant nasturtiums alongside these companions for better growth:

Tomatoes Cucumbers Squash Beans

The Bottom Line

Nasturtiums can be grown successfully across Delaware, but your exact planting dates depend on which region you're in. Northern Delaware gardeners should plan around a Apr 10 - Apr 25 last frost, while those in Southern Delaware can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Nasturtiums Growing Guide National planting guide with all states Delaware Planting Calendar All plants for Delaware Nasturtiums in Alabama Alabama planting dates Nasturtiums in Alaska Alaska planting dates Nasturtiums in Arizona Arizona planting dates Nasturtiums in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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