Preparing to Plant Nasturtium Seedlings
Planting nasturtium seedlings successfully begins before they even touch the soil. Nasturtiums are remarkably forgiving, but a little preparation ensures they thrive from the start, rewarding you with their distinctive trumpet-shaped flowers and peppery foliage. Understanding their basic needs – good drainage, adequate sunlight, and spacing – is key to cultivating a flourishing display.
Before you begin, gather your supplies. You'll need your nasturtium seedlings, a trowel, compost (if your soil isn't rich), and a watering can. Ensure the soil in your garden bed or container is loose and well-draining. Nasturtiums dislike 'wet feet' and can suffer from root rot if waterlogged. If planting in pots, use a quality potting mix; for garden beds, amending heavy clay soil with grit or compost is advisable.
Consider where your nasturtiums will live. They prefer a sunny spot, ideally receiving at least six hours of sunlight daily, though they will tolerate partial shade, especially in warmer climates. This shade tolerance can be useful; for instance, while you might be thinking about when to plant petunia seeds for full sun, nasturtiums offer a more flexible option for brighter borders or containers that get some afternoon shade. Plan the final spacing too; mature nasturtium plants, particularly the trailing varieties, can spread up to 60cm (2 feet). Giving them room prevents overcrowding and promotes air circulation, which helps deter pests and diseases.
- Choose a sunny or partially shaded location.
- Ensure soil is well-draining; amend if necessary.
- Allow ample space for mature plants to spread.
- Gather trowel, compost (if needed), and watering can.
Step-by-Step: How to Plant Nasturtium Seedlings
What is the correct method for planting nasturtium seedlings? The process is designed to minimise transplant shock and establish the plant quickly. By following these straightforward steps, you'll give your young nasturtiums the best possible start, paving the way for abundant blooms throughout the summer.
1. Prepare the Planting Hole
Using a trowel, dig a hole that is slightly larger than the seedling's root ball. The depth should be such that when the seedling is placed in it, the top of the root ball will be level with the surrounding soil surface. If you're planting multiple seedlings, space them according to their mature size – trailing varieties need more room than bush types. For context, consider how you might approach growing cosmos in pots; similar principles of adequate space apply to prevent competition.
2. Gently Remove Seedling from Pot
Carefully ease the nasturtium seedling out of its current container. You can often achieve this by gently squeezing the sides of a plastic pot or inverting a deeper pot while supporting the base of the stem. Avoid pulling the stem, as this can damage the young plant. If the roots are tightly bound (root-bound), gently tease them apart at the bottom to encourage outward growth, but be delicate – nasturtiums don't always appreciate excessive root disturbance.
3. Position and Plant the Seedling
Place the seedling into the prepared hole. Ensure the top of the root ball is flush with the soil level. It's crucial not to plant it too deep, as this can lead to stem rot. For bush varieties, you can plant them closer together, perhaps 20-30cm (8-12 inches) apart. Trailing types might need up to 60cm (2 feet) between plants to allow them to spread effectively across garden beds or spill over the edges of containers. This careful positioning is vital for robust growth.
4. Backfill and Water
Gently backfill the hole with soil, firming it lightly around the base of the seedling to eliminate air pockets and ensure good root-to-soil contact. Water the newly planted seedling thoroughly. This initial watering helps settle the soil and provides much-needed moisture to the roots, aiding in the establishment process. Continue to water regularly, especially during dry periods, until the plant is well-established.
Nasturtiums thrive in poorer soil, so avoid over-fertilising, which can lead to lush foliage at the expense of flowers.
When planting, consider the benefits of companion planting. Nasturtiums are excellent companions for many vegetables, such as brassicas, deterring aphids, and can be planted near roses to distract black spot. Their edible flowers and leaves add a peppery note to salads, making them a versatile garden addition.
Post-Planting Care and Troubleshooting
Once your nasturtium seedlings are in the ground, consistent care is paramount for sustained growth and flowering. While nasturtiums are generally low-maintenance, observing them for signs of stress or pests will help you address issues before they become significant problems. Think of this as the verification stage after planting.
Watering and Feeding
Water your newly planted nasturtiums regularly, especially during the first few weeks as they establish. Once established, they are quite drought-tolerant, but consistent moisture will result in better flowering. Allow the soil to dry out slightly between waterings. As mentioned, resist the urge to feed them heavily. A light feeding with a balanced liquid fertiliser once or twice during the growing season is sufficient, if at all. Over-fertilising, particularly with nitrogen-rich feeds, promotes leaf growth over flower production, which is precisely the opposite of what you want. If you are growing cosmos in pots, you might find they need more frequent feeding than nasturtiums.
Pest and Disease Management
The most common pest affecting nasturtiums is the cabbage aphid, especially on the undersides of leaves and flower buds. A strong jet of water can often dislodge them. If the infestation is severe, insecticidal soap or neem oil can be used, but always follow product instructions carefully. Slugs and snails can also be a nuisance, particularly to young seedlings. Protecting young plants with barriers or specific slug deterrents might be necessary. Fungal diseases like powdery mildew can occur in humid conditions or where air circulation is poor. Ensuring good spacing when you plant nasturtium seedlings is your first line of defence.
Troubleshooting Common Issues
If your nasturtiums are producing lots of leaves but few flowers, they are likely receiving too much fertiliser or too much water. Try reducing both. Yellowing leaves can indicate overwatering or poor drainage. Browning leaf tips might suggest underwatering or dry air. If you notice wilting despite adequate watering, check the roots for rot, which points to poor drainage. Remember that nasturtiums are typically grown as annuals in cooler climates, so if you're wondering how long do primroses last, understand that nasturtiums have a seasonal life cycle, though some might self-seed.
To encourage bushier growth and more flowers on climbing or trailing varieties, gently pinch back the tips of young stems. This simple action redirects the plant's energy into producing more side shoots and subsequent blooms, rather than just long, leggy stems.
Alternative Planting Locations and Uses
Nasturtiums are incredibly versatile. Their trailing habit makes them ideal for hanging baskets, window boxes, or cascading over walls and rockeries. Bush varieties are excellent for filling gaps in borders or containers. Their vibrant colours, ranging from deep reds and oranges to sunny yellows, can complement other summer blooms. Consider planting them near vegetables like cucumbers or tomatoes, or as a ground cover under taller plants. They are also wonderful when interplanted with plants that require a bit more attention, like fuchsias which may need different propagation methods, such as when to take cuttings of fuchsias, but benefit from nasturtium's pest-repelling qualities.
The flexibility in their planting needs and tolerance for less-than-ideal soil conditions makes them a favoured choice for gardeners of all experience levels.