7 Top Flowers for March for a Summer Flower Bed

March can still make the garden look grey and dormant. Yet this is precisely the time to lay the foundations for a summer flower bed that keeps flowering into autumn. Choose suitable flowers, handle late frosts wisely and follow a few straightforward techniques, and a handful of unremarkable seeds can become a burst of colour.

Why March determines your summer flower bed

As spring arrives, many amateur gardeners are eager to get started. Days grow longer, sunshine becomes more frequent and the ground slowly thaws. Despite this sense of renewal, March remains unpredictable: mild afternoons, icy mornings and late frosts lasting into April are all common.

Sowing straight into the bed now can leave seedlings frozen or stalled in cold soil for weeks. For that reason, experienced gardeners begin many of their summer flowers under cover:

• in a bright conservatory
• in a simple polytunnel or small greenhouse propagator
• on a sunny indoor windowsill

Starting plants indoors gives them a two- to four-week head start – and often means substantially earlier, more abundant flowering.

Particularly worthwhile are varieties that continue producing fresh buds from June into autumn. They fill gaps in the bed and prevent those familiar flowerless spells when everything seems to finish blooming at once.

The right seeds: what gardeners really look for

Many people know the disappointment: you buy a packet, sow enthusiastically and water carefully – only for a few isolated plants to emerge. Often, the issue is not a “bad pair of green fingers”, but the seed itself.

That is why more gardeners are choosing open-pollinated varieties. You can raise these varieties year after year from seed harvested from your own plants. Over time, they adapt to your soil and climate, and can often prove hardier than newly bought varieties.

Practical ways to find good seed include:

• Choose open-pollinated varieties: The seed packet will usually state whether a variety can be saved and grown again.
• Use seed swaps: Many communities have seed-swap shelves at libraries or local neighbourhood hubs.
• Harvest your own: Leave some faded flowers in place, then collect dry seed heads in late summer.

Anyone who continues this process year after year will often notice that their plants become more resistant to drought, wind and local pests – a quiet breeding process taking place in their own garden.

The 7 top flowers for March – a summer garden from a packet of seeds

Now for the stars of the summer flower bed. These seven flowers can be started successfully indoors in March, forgive minor mistakes and provide colour from early summer until late in the season.

Zinnias: bursts of colour for beds and vases

Zinnias are among the classic summer flowers. Their large, vivid flower heads in pink, orange, yellow, white and bi-coloured combinations stand out even from a distance.

• Position: Sunny and warm
• Soil: Loose and reasonably rich in nutrients
• Starting: Raise indoors in March, then plant outside from mid-May

Regularly deadheading faded blooms brings its reward: zinnias keep sending up new buds. They are ideal for colourful summer bouquets – and the more you cut, the bushier the plants become.

Fragrant climbers: sweet peas for a nostalgic look

Sweet peas bring the charm of traditional cottage gardens back to life. Their blooms have an intense fragrance, while their tendrils climb trellises, fences and balcony railings.

• Position: Full sun to partial shade
• Special feature: They need a support to climb
• Tip: Soak the seeds in water for several hours before sowing to improve germination.

The same rule applies here: cut generously. Picking bouquets regularly prevents seed production and keeps flowers coming for weeks.

Nasturtiums: edible splashes of colour

Nasturtiums are almost a “beginner’s secret tip”. They grow quickly, cover bare patches and bring warm yellow, orange and red tones to beds and window boxes.

Nasturtium leaves and flowers are edible, with a mildly peppery flavour – a kind of natural cress substitute in summer salads.

They also thrive in poor soil, require very little care and are well suited to covering unattractive fencing or banks.

Wallflowers: fragrant companions for flower beds

Plants still listed as wallflowers in some catalogues are valued for their warm, often multi-coloured flowers and strong scent.

• Position: Sunny and sheltered
• Use: Ideal beside paths, along terrace edges or in front of walls

They work well in mixed borders with perennials, as they provide early colour while other plants are only beginning to grow.

Coreopsis: sunny, long-flowering plants

Coreopsis offers yellow to orange blooms that appear from summer right through to autumn.

These plants cope well with relatively poor soil and are a good match for naturalistic gardens. Removing faded stems regularly encourages almost uninterrupted fresh flowers – and makes them a magnet for bees and butterflies.

Love-in-a-mist: delicate flowers with airy foliage

Love-in-a-mist has fine, feathery foliage and star-shaped blooms, creating an especially romantic effect. Once flowering has finished, it develops decorative seed pods that also work beautifully in dried arrangements.

• Effect: A very natural, almost meadow-like appearance
• Combination: Pairs well with poppies, cosmos or delicate grasses

Allow a few plants to set seed and you will often find self-sown love-in-a-mist appearing in the bed again the following year.

Poppies: meadow character in your own garden

Poppies bring the slightly wild, gently untidy appearance of flowering fields into the home garden. Their silky petals seem almost translucent, in shades ranging from soft pink to deep red.

Poppies tend to self-seed. Once established, new plants often appear in unexpected places the following year – a benefit for anyone who likes a relaxed, naturalistic style.

How to make March sowings succeed without frustration

A few simple principles will help turn these seven favourites into strong summer flowers:

• Use fine soil: Special seed compost or sieved garden soil is suitable for raising young plants.
• Do not sow too deeply: As a rule of thumb, cover seeds with no more than twice their own depth of soil.
• Keep them evenly moist: Avoid both waterlogging and drying out; a gentle mist spray is ideal.
• Provide plenty of light: Bright windowsills or a small indoor propagator prevent long, leggy growth.
• Harden off before planting out: Put young plants outdoors during the day for several days, then bring them back inside at night.

Gradually acclimatising seedlings to sunshine and wind prevents scorched leaves and growth shock after planting in the bed.

What makes this flower combination so exciting

The garden becomes especially interesting when you combine the seven varieties deliberately. Place tall zinnias at the back, with love-in-a-mist and coreopsis in front, islands of nasturtiums between them and sweet peas climbing along a fence. The result is a scene that changes constantly throughout the summer.

Thoughtful combinations offer more than extra colour; they also provide ecological benefits. Different flower shapes attract different insects, improving pollination across the whole garden. At the same time, some varieties attract beneficial insects that help keep aphids and other pests under control.

Benefits for balconies and small gardens

These flowers are not restricted to large gardens. Many are equally suitable for window boxes, containers and raised beds. Nasturtiums, love-in-a-mist and coreopsis can also cope with limited root space if they receive regular watering.

If space is limited, stagger the sowings: start one batch indoors in March, then sow another directly into boxes or pots in April. This shifts flowering slightly later and lets you enjoy your miniature summer garden for longer.

Every year, March demonstrates how much potential there is in a few grams of seed. Those who take time now to choose and raise plants can, a few months later, walk through a sea of flowers that was only a handful of inconspicuous seeds in winter.