Tropaeolum majus, commonly called nasturtium, is a tender annual native to the Andes Mountains of South America, prized for its vibrant edible flowers and peppery leaves. Seeds feature a thick seed coat requiring scarification and soaking for reliable germination, which typically occurs within 7-14 days under warm conditions in complete darkness. This easy-to-grow ornamental is valued for both its ornamental beauty and pest-repelling properties in vegetable gardens.
Before sowing
Escarificação e embebição em água morna na noite anterior
Sowing
What to expect
Tips
Scarify seeds by nicking with a knife or lightly sanding, then soak overnight in warm water. Seeds require darkness to germinate—cover trays completely or use opaque containers. Maintain high humidity and warmth (18-21°C) until germination appears. Do not use rich soil; poor, well-draining substrate promotes better flowering. Once established, provide full sun and allow soil to dry between waterings. Acclimatize seedlings gradually over 2-3 weeks before transplanting outdoors. Nasturtium seedlings are vigorous and fast-growing; handle with care due to delicate stems.
Sources: Wisconsin Horticulture Extension, Gardenia.net, World of Flowering Plants, Harvest to Table, Seed Needs LLC, Love The Garden
