Nasturtiums, with their vibrant blooms and edible leaves, are popular garden additions. While it is possible to transplant nasturtiums, they are known to be particularly sensitive to the process. Success largely depends on careful handling and specific techniques to minimize stress on the plant.
Understanding Nasturtium Sensitivity
Nasturtiums have a delicate root system highly susceptible to disturbance. Damage during transplanting hinders their ability to absorb water and nutrients, leading to transplant shock. Symptoms include wilting, yellowing leaves, leaf or flower loss, and stunted growth. Severe shock can compromise the plant’s health and even lead to death.
Best Practices for Successful Transplanting
The optimal time for transplanting nasturtiums is when they are very young seedlings, ideally as their first true leaves begin to form. To prepare the new site, choose a sunny location with well-draining soil, ensuring enough space between plants, typically 8-12 inches (20-30 cm). Dig a hole that is roughly twice the size of the seedling’s root ball, and consider adding compost to the bottom for added nutrients.
Water seedlings thoroughly a day before transplanting. Gently separate seedlings in trays, carefully lifting them with a spoon or small tool, keeping soil around the roots. Place the entire root ball gently into the prepared hole at the same soil depth as it was previously to prevent stem rot. Backfill the hole with soil, firming it lightly around the plant’s base, and water thoroughly immediately after planting to help the soil settle.
Post-Transplant Care
Consistent care is important for nasturtium recovery after transplanting. Water newly transplanted nasturtiums deeply but gently, ensuring the soil remains consistently moist without becoming waterlogged. Adequate moisture is crucial in the initial weeks to help roots establish, but overwatering can cause root rot. Providing temporary shade for a day or two after transplanting can help reduce stress from direct sunlight.
Monitor plants closely for any signs of stress, such as wilting or discoloration. If shaded initially, gradually reintroduce them to full sun over several days. Avoid fertilizing immediately after transplanting, as this can add further stress. A balanced fertilizer can be introduced about a month after transplanting to promote growth and flowering.
Tips for Minimizing Transplant Shock
To significantly reduce the risk of transplant shock, consider starting nasturtium seeds in biodegradable pots, such as peat pots or fiber pots, that can be planted directly into the ground. This method minimizes root disturbance, as the entire pot can be placed into the soil without removing the seedling. Another important step is hardening off seedlings before moving them outdoors permanently. This process involves gradually exposing young plants to outdoor conditions over about a week, acclimating them to sun, wind, and temperature fluctuations.
For nasturtiums, direct sowing seeds into their final outdoor location is often the most recommended method to bypass transplanting altogether. Nasturtium seeds are relatively large and easy to handle, and direct sowing eliminates root disturbance, making it the easiest method for these sensitive plants. If starting indoors, sow seeds 4-6 weeks before the last frost, ensuring they are not kept indoors too long before transplanting.