Growing Nasturtiums in Zone 3B

Nasturtiums are edible, pest-trapping flowers with peppery leaves and vibrant blooms.

Zone 3B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

Top Growing Tips

• Direct sow after frost — they don’t transplant well
• Use as trap crops for aphids — they attract pests away from vegetables
• Flowers, leaves, and seeds are all edible (peppery, like watercress)
• Too-rich soil produces lots of leaves but fewer flowers
• Trailing varieties are beautiful in hanging baskets and window boxes

Companion Planting

Good companions: tomatoes, cucumbers, cabbage, beans — excellent trap crop

Avoid planting near: none — nasturtiums are beneficial companions

Harvest Timeline

Flowering begins 50-60 days from seed; use flowers and leaves fresh

About Zone 3B

USDA Hardiness Zone 3B has an average last spring frost around May 15 and first fall frost around Sep 15. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.