What to Plant and Sow in March for a Productive Garden

Plant and sow wisely in March and you can harvest colourful blooms, crisp vegetables and fresh salads throughout the summer. In the garden, this month acts rather like a reset button: soils begin to warm up, daylight hours increase and the risk of frost declines. Many plants now establish the foundations for a productive season – provided they are put in the right place at the right time.

Why March is a key month in the garden

In March, the garden quite literally starts to stir. The first weeds emerge quickly, the sun already has some strength, and the soil is often dry enough to prepare beds. Getting started now gives plants a clear head start in growth.

March is ideally suited to hardy perennials, the first outdoor vegetable sowings and raising many summer flowers from seed.

Soil condition is the crucial consideration. It must no longer be frozen or completely waterlogged. If it can be rubbed into fine crumbs, it is a good time to sow and plant. Carefully clear away larger stones, roots and debris left from the previous year so that roots can develop without obstruction.

Flowers to plant in March: colour for spring and summer

Annual cut flowers for beds and vases

Gardeners hoping to cut abundant home-grown bouquets in summer often make the first preparations in March. A number of traditional bedding and cut flowers can be planted early.

Common choices for sowing or planting in early spring include:

• Pot marigolds – reliable, tough and excellent for filling gaps
• Pansies – available as young plants for window boxes and flower beds
• Cornflowers – popular with bees and bring vivid blue to beds
• Sweet peas (as young plants) – ideal for trellises or fences

Pansies and pot marigolds can either be planted into beds as young plants or sown directly once the ground has dried out. Many gardeners prefer to raise sweet peas indoors or in a greenhouse, producing sturdy young plants that can later be moved outside.

Summer-flowering bulbs and tubers

March is also the right time to look ahead to summer. Many summer-flowering bulbs and tubers are planted between late February and early April, then decorate the garden from June to August.

Popular options to plant in March include:

• Lilies – striking flowers, ideal for sunny positions
• Tuberous begonias – for partially shaded beds and window boxes
• Californian lilac (ornamental shrub) – clouds of blue flowers in early summer
• Hydrangeas – suitable as container-grown plants and thrive in humus-rich soil
• Rhododendrons – for acidic, loose soil in partial shade
• Weigela – a profusely flowering ornamental shrub for hedges and specimen planting

Freely draining, evenly moist soil is essential for these plants. Waterlogging is particularly damaging to bulbs and tubers, so it is worth adding a loose drainage layer of sand or fine gravel, especially in heavy clay soils.

Summer-flowering bulbs and shrubs planted in March repay the effort with masses of flowers just as spring blooms begin to fade.

Vegetables in March: what can go into the bed now

March marks the true beginning of the vegetable-growing season. The first outdoor sowings can provide harvests as early as early summer. At the same time, heat-loving crops are being raised indoors or in the greenhouse.

Hardy varieties for direct sowing

As soon as the ground is no longer frozen and can be worked easily, the first hardy vegetables can be sown directly outdoors:

• Cabbages such as white cabbage and broccoli (often also started as an early crop in a cold frame)
• Cauliflower
• Kale and other leafy brassicas
• Lamb’s lettuce
• Watercress and other cresses
• Peas and broad beans
• Onions for the main crop
• Parsnips
• Swedes

Many gardeners also sow classic root vegetables such as carrots and beetroot in March. The benefit is that these crops mature especially evenly in cooler temperatures and are less prone to bolting.

Salads and tender vegetables: build the base now

From mid to late March, when daylight becomes noticeably longer, it is worth turning attention to salad beds. This is when the first sowings for quick, tender harvests can go into the soil:

• Lettuce and cut-and-come-again salad leaves
• Spinach
• Hot mustard leaves
• Lamb’s lettuce for a later harvest
• Chillies (started indoors)
• Tomatoes (also raised in warm conditions)

Tomatoes and chillies should not be planted outdoors in March. They require a long, warm growing period, so they are best started on a windowsill or in a heated greenhouse. Starting too late can result in weak plants and much later harvests.

Fruit in March: pruning, care and new planting

For fruit trees and berry bushes, March is a month for setting the direction of the season. Many varieties will begin growing shortly, making maintenance and checks the priority now.

• Final pruning for apples and pears: shaping and thinning cuts should be completed before the buds open.
• Plant new berry bushes: container-grown currants, gooseberries and raspberries can be planted successfully now.
• Check growing positions: waterlogged roots reduce the health and yield of fruiting woody plants.

Gardeners who care for and prune fruiting woody plants properly in March lay the foundations for reliable harvests and healthy trees in the years ahead.

Responding to the climate: March is becoming warmer

Studies show that spring is warming particularly strongly in many regions. As a result, plants come into growth earlier, often followed by late frosts or dry periods. Gardeners need to adapt to this.

Managing water in the garden

Heavy rainfall alternating with prolonged dry spells has now become routine for many home gardeners. A few straightforward measures can help plants remain resilient:

• Collect rainwater in water butts or cisterns
• Use mulch layers of grass clippings, leaves or straw to prevent drying out
• Create slightly raised beds so water can drain away more effectively
• Include deep-rooted shrubs and perennials as “water buffers”

Keeping soil rich in humus enables it to retain more water and nutrients. Compost and well-rotted manure greatly improve its structure and help moderate temperature fluctuations.

Think ahead to April: a head start for summer and autumn

Gardeners who plan in March will face less pressure in April. The following month is particularly suitable for getting heat-loving crops underway and establishing herb beds.

Start the herb garden in good time

In April – and, in sheltered spots, partly from late March – basil, parsley and chives begin to take centre stage. These herbs grow well in pots, raised beds or narrow borders by the patio. Those who plant young plants or sow seed now can often harvest well into autumn.

Plan now for the autumn harvest

Later highlights can be planned early too. Many gardeners start sunflowers, pumpkins and courgettes in April, either indoors or in the greenhouse. The strong young plants are then moved outside in May and produce generous crops in late summer and early autumn.

Practical example: what a March plan could look like

Area	Task for March
Flower bed	Plant pansies, sow cornflowers, plant tuberous begonias
Vegetable bed	Sow peas, parsnips, swedes and the first salads
Fruit garden	Prune apple and pear trees, plant new berry bushes
Herbs and warmth-loving plants	Raise tomatoes and chillies indoors, plan herbs

Taking an afternoon in March to prepare beds, write planting lists and organise seeds makes the rest of the season more relaxed. Many mistakes result from rushing shortly before the late-May frosts – a clear spring plan prevents this.

One further point is often underestimated: companion planting. Combinations such as carrots and onions, lettuce between more slowly growing brassicas, or pot marigolds at the edge of a bed can deter pests and make the best use of available space. This turns a simple March start into a well-planned gardening year with higher yields and fewer problems.