What Seeds to Sow in March: A Gardener's Guide
March is a critical month for gardeners, signalling the transition from winter to spring and presenting a prime opportunity to sow a diverse range of seeds. Whether you are looking to cultivate vegetables, herbs, or flowers, the conditions in March allow for both indoor sowing and direct outdoor planting, depending on your region and the specific plant's needs. Understanding what seeds to sow in March ensures you maximise your growing season and enjoy bountiful results.
- Sow hardy vegetables indoors and outdoors in March.
- Start tender plants under protection for later transplanting.
- March is ideal for sowing many herb and flower seeds.
- Consider planting spring bulbs for late spring displays.
For many, the urge to get growing intensifies as days lengthen and temperatures gradually rise. It is important to balance enthusiasm with practical considerations like soil temperature, frost risk, and the specific requirements of each seed variety. This guide explores the most rewarding seeds to sow in March, offering alternatives for different garden situations and preferences.
Vegetables and Herbs: Early Spring Sowing
March offers a dual approach for vegetable and herb cultivation: starting tender crops under protection and sowing hardy varieties directly into the soil. This strategic planting ensures a staggered harvest and a continuous supply throughout the growing season. When considering what vegetables can I plant now, focus on those that tolerate cooler soil and shorter growing periods initially.
Indoors First: Tender Crops
For those aiming to grow less hardy vegetables or wanting an earlier start on common favourites, sowing indoors is key. Tomatoes, peppers, chillies, aubergines, and cucumbers benefit greatly from a warm start. Sow these in pots or seed trays filled with a good quality seed compost, ideally in a heated propagator or on a warm windowsill. Once seedlings emerge, ensure they receive ample light to prevent them from becoming leggy. These will typically be transplanted outdoors or into larger containers once the risk of frost has passed, often in late May or early June.
Direct Outdoor Sowing: Hardy Choices
March is also excellent for sowing hardy vegetables directly into the ground, provided the soil is workable and not waterlogged. Peas, broad beans, spinach, lettuce, radishes, and rocket can all be sown outdoors. These crops are more tolerant of cooler temperatures and can establish themselves before the summer heat arrives. For a continuous harvest of salad crops like lettuce and rocket, sow small batches every few weeks. This method is a straightforward way to get ahead, especially for those new to gardening or seeking simpler planting routines. If you are planning for later harvests, consider what to plant in August; some early March sowings might support this if managed correctly.
Herbal Delights
Many popular herbs can also be sown in March. Parsley, chives, and coriander are good candidates for indoor sowing or direct outdoor planting in milder areas. Mint, while often propagated from cuttings, can also be grown from seed. These provide fresh flavour for cooking and can be grown in pots or directly in the ground, making them versatile additions to any garden space. For those looking for winter plants for pots, some herbs sown now might be managed to last through milder periods if protected.
The diversity of seeds you can sow in March provides a foundation for a productive garden, offering a chance to experiment with a wide range of plants.
Flowers and Spring Bulbs: Colour Through the Seasons
Beyond vegetables and herbs, March is an opportune time to introduce colour and life into your garden through flower and spring bulb sowing. While many spring bulbs are planted in autumn, there are still opportunities for late planting or sowing seeds that will bloom later in the year.
Sowing Flower Seeds
Many annual flowers can be sown directly into the soil in March, especially in sheltered spots or milder regions. Examples include poppies, cornflowers, calendula, and nigella. These hardy annuals germinate well in cooler soil and will grow rapidly to provide blooms throughout summer. For more tender varieties, such as zinnias or cosmos, starting them indoors under protection is advisable. These will be ready to transplant outside after the last frost. Consider what to plant now for a succession of blooms; by sowing a mix of early, mid, and late-flowering varieties, you can ensure continuous visual interest.
When to Plant Spring Bulbs
While the main season for planting spring bulbs like tulips and daffodils is autumn, there are still options for March. If you find bulbs left over from autumn sales or have acquired them late, planting them now can still yield results, albeit potentially later blooming or smaller flowers. These are often referred to as bulbs to plant now, and success depends on selecting bulbs that are still firm and healthy. For a more reliable display, focus on seeds of summer-flowering bulbs like gladioli, dahlias, and lilies, which can be sown or planted now. Alternatively, if you missed planting flowers that bloom in autumn, consider seeds that can be sown now for late summer and autumn displays.
Don't discard bulbs that look slightly shrivelled; soak them in water for 24 hours before planting, as this can help revive them for late-season flowering.
Alternative Planting Strategies for March
For gardeners seeking to diversify their planting approach or adapt to specific garden conditions, several alternative strategies can be employed in March. These methods cater to different space constraints, soil types, and desired outcomes, ensuring that most gardens can benefit from early spring sowing.
Container Gardening and Potting
Container gardening offers a flexible solution, especially for small spaces, balconies, or patios. Many of the vegetables and flowers mentioned can be grown successfully in pots. For instance, lettuce, radishes, spinach, and herbs are excellent choices for containers. When sowing seeds to sow in march uk gardens, especially in urban settings, container methods provide control over soil and drainage. Ensure pots are adequately sized and use a good quality potting mix. Tender plants started indoors can be potted up into larger containers before their final move outdoors. This approach also makes it easier to provide protection for young plants against late frosts or pests.
No-Dig and Raised Beds
For those interested in soil health and reduced physical effort, March is an excellent time to prepare and plant in no-dig beds or raised beds. Raised beds warm up faster in spring, allowing for earlier sowing of hardy crops like peas and broad beans. In no-dig systems, a layer of compost is simply added to the surface, and seeds are sown directly into this nutrient-rich layer. This minimises soil disturbance, which is beneficial for soil structure and the organisms within it. This is particularly relevant for what to plant in march, as it prepares beds for direct sowing without the need for extensive tilling.
Companion Planting Considerations
As you plan your seeds to sow in March, consider the benefits of companion planting. Pairing certain plants can deter pests, attract beneficial insects, or improve growth. For example, sowing radishes near lettuce can help deter flea beetles, and planting marigolds among vegetables is known to repel nematodes. Incorporating herbs like basil near tomatoes is another classic pairing. Thinking about these combinations during the initial sowing phase can lead to a healthier, more resilient garden with fewer pest issues and potentially higher yields.
What to Plant Now: A Quick Reference
To summarise, for many gardeners, the key is to start hardy vegetables and some flowers directly outdoors, while giving more tender varieties a head start indoors. This balanced approach is fundamental to successful spring gardening. If you are unsure about what to plant now, focusing on the more resilient options is a safe bet.
Maximising Your March Sowing Success
Achieving the best results from your seeds to sow in March requires attention to detail and an understanding of basic horticultural principles. Even with the best intentions, a few common pitfalls can hinder germination and growth.
Soil Preparation and Warming
The condition of your soil is paramount. March can still bring cold, wet conditions, so ensure your soil is free-draining. Raised beds and amended soil with organic matter help significantly. For outdoor sowing, wait until the soil has warmed sufficiently and is workable – avoid tilling heavy, sodden earth, as this can create a compacted, poor structure. For seeds sown indoors, using a high-quality seed compost provides the ideal environment for germination, offering a sterile medium free from weed seeds and pathogens.
Watering and Protection
Consistent moisture is vital for seed germination, but overwatering can lead to rot or damping off, especially in cooler conditions. Water gently, perhaps with a watering can fitted with a fine rose, and ensure pots and beds drain well. For seedlings started indoors, adequate light is crucial to prevent them from becoming weak and elongated. Protect outdoor sowings from harsh winds, heavy rain, and late frosts using cloches, fleece, or cold frames, particularly for more sensitive seedlings or newly emerged plants.
Pest and Disease Watch
Young seedlings are vulnerable to a range of pests and diseases. Slugs and snails are notorious for decimating young greens. Using barriers, organic slug pellets, or simply hand-picking them off can help. Ensure good air circulation around plants to minimise fungal diseases. For indoor sowings, a sterile compost mix and clean trays reduce the risk of damping off. Regularly inspecting your plants allows you to spot problems early, when they are most manageable.
By carefully selecting which seeds to sow in March and providing them with the right conditions, you lay the groundwork for a flourishing garden. The flexibility of March planting allows for both immediate outdoor sowing of hardy crops and the essential indoor start for more tender plants, ensuring a continuous cycle of growth and harvest.