As the thaw of March signals the start of the gardening season, enthusiasts find themselves at a crucial crossroads: preparing the beds for a vibrant summer display. While the period for planting spring-flowering bulbs like tulips and daffodils is firmly behind us, this transition phase is the ideal time to focus on summer-flowering varieties. Whether you are planting directly into garden soil or jumping ahead by starting tender bulbs indoors, careful planning now is the secret to a long, flourishing season.
Understanding Your Bulb Categories
Effective bulb management starts with distinguishing between the seasons. If you missed the autumn planting window for traditional spring bulbs, you can still bridge the gap by purchasing plants sold “in the green.” These are active, foliage-bearing plants—such as snowdrops, bluebells, and occasionally daffodils—that are lifted shortly after flowering. Because they are already growing, they transplant with higher success rates than dormant bulbs.
However, the real excitement for gardeners in March lies in summer-blooming bulbs. Varieties such as dahlias, gladioli, begonias, crocosmia, and cannas are primed for planting, promising a cascade of color through the warmer months.
Strategic Planting for Summer Impact
To maximize your harvest, focus on the specific needs of each variety:
- Dahlias and Cannas: These tropical-leaning favorites require warmth. In temperate zones, you can begin these in pots indoors during March, keeping them in a frost-free, bright environment until the danger of spring frost has passed in late May.
- Gladioli: For a continuous display, stagger your planting every two weeks from now until May. This “succession planting” technique ensures you have fresh spikes of color throughout the late summer.
- Crocosmia and Eucomis: If you have sunny, sheltered spots or south-facing walls, these exotic gems offer vertical interest. Crocosmia, in particular, is a magnet for local pollinators, including hummingbirds.
- Tuberous Begonias: Perfect for containers and shaded areas, these should be started in trays with the hollow side facing up. Maintain a moist environment, but hold off on heavy watering until the shoots emerge.
Essential Care and Maintenance
Success in the garden is rarely left to chance. Proper soil preparation is your first line of defense; if your ground is heavy clay, integrate grit and organic compost to ensure the excellent drainage required to prevent bulb rot. When planting, a reliable rule of thumb is to bury the bulb at a depth of two to three times its diameter. This provides both the insulation needed against late-season cold snaps and the structural support for tall plants like gladioli.
As the season progresses, remain vigilant against common garden pests. Slugs and snails are particularly fond of tender new shoots in early spring; using horticultural barriers or organic nematodes can keep them at bay. Additionally, monitor for vine weevils in pots and aphids on soft growth, addressing these early to ensure your plants reach their full potential.
Cultivating Your Vibrant Display
As you look toward the coming months, keep your horticultural fleece handy to protect young growth from unexpected late-spring frosts. As the weather warms and your plants gain height, treat them to a high-potassium liquid fertilizer every fortnight to shift their energy away from leafy development and toward those anticipated vibrant blooms.
By balancing early indoor preparation with careful soil management and timely protection, you can transform your garden into a late-summer sanctuary. With a little foresight this month, you will be rewarded with a rich, rewarding display that stretches well into the first frosts of autumn.