What to Plant and Sow in March for a Productive Garden

The days are getting longer, the ground is thawing – and anyone who gets started now can gain months of advantage for abundant blooms and productive beds.

March is a genuine fresh start in the gardening calendar. The sun appears more often, the soil begins to warm up, and many amateur gardeners are eager to get going. Planting and sowing wisely now lays the foundations for colourful flower beds, flavourful vegetables and plentiful fruit harvests in summer and autumn.

Why March is such an important month for planting

During March, beds, shrubs and perennials emerge from winter dormancy. Temperatures gradually rise, while the likelihood of prolonged hard frost falls noticeably. These conditions work in the gardener’s favour: seeds germinate more reliably, young plants establish faster, and the growing season is effectively extended.

“Planting and sowing in March does not push the harvest back – it brings it forward.”

The soil itself is the key indicator. If it crumbles easily without turning into sodden mud, conditions are usually suitable. Seeds can rot easily in excessively wet soil, while very cold ground causes them to germinate only slowly.

Spring flowers and cut flowers for the perfect summer bouquet

Many flowers that fill beds with colour in June and July need to be started in March. Planning window boxes and borders early means you can later pick flowers for a vase rather than buying costly supermarket bouquets.

Popular flowers to sow or plant in March

For a vibrant mix of plants in the border, consider:

• Calendulas – hardy, low-maintenance and ideal for filling gaps in beds
• Pansies – a classic spring flower that also suits window boxes
• Cornflowers – perfect for naturalistic gardens and popular with bees
• Sweet peas – generally planted as young plants and producing wonderfully fragrant cut flowers

Many of these flowers can be sown straight into the ground once the soil has thawed. Sweet peas do particularly well when started indoors, either in pots on a windowsill or in a cold frame. Once plants reach 10–15 centimetres tall and nights are largely frost-free, they can be moved outside.

How to sow cut flowers successfully

• Loosen the bed and remove stones and thick roots
• Make shallow drills and scatter the seeds thinly
• Cover only lightly with soil, firm gently and water carefully
• Label the rows so you can identify what is growing where later on

“The looser and more stone-free the soil, the straighter and stronger the stems will grow – perfect for the vase.”

Summer-flowering shrubs and bulb plants

Anyone hoping for flowering shrubs as well as flower beds in summer should use March for new planting. This gives plants several months to develop roots before the main summer heat arrives.

Suitable plants for spring planting

Typical plants that can go into the ground in spring include:

• Weigela – flowers profusely and is popular for informal hedging
• Lilies – grown from bulbs, with striking summer blooms
• Tuberous begonias – suited to containers and partially shaded areas
• California lilac – produces a display of blue flowers and attracts insects
• Hydrangeas – a classic choice for partially shaded corners
• Rhododendrons – prefer acidic soil and consistently moist conditions

All of these plants favour fresh, free-draining soil. Waterlogging can quickly cause root rot, so on heavy ground it is worth adding a drainage layer of grit or coarse sand.

“Plant shrubs in March in moist but well-drained soil – this helps them develop a stable root system before summer.”

Vegetables: what can be sown directly outdoors in March

Many tough vegetable crops can be started directly outside. One useful sign is weed growth: when weeds begin to emerge visibly, the soil is warm enough for the first sowings.

Hardy vegetables for spring sowing

Vegetables that can usually be sown outdoors in March include:

• Brassicas such as white cabbage, broccoli, cauliflower and kale
• Lamb’s lettuce and land cress
• Peas and broad beans
• Onions, either from seed or sets
• Parsnips and swedes or turnips

A well-prepared bed is essential: loosen the soil deeply, remove perennial weeds and make the surface as level as possible. Keep to appropriate spacing between rows to make later weeding and hoeing easier.

Caring for fruit bushes and trees in March

March is the time for final fruit-growing jobs before buds break:

• Apple and pear trees receive their last winter prune
• New currant, gooseberry or raspberry bushes can now be planted as container-grown plants
• Water thoroughly after planting and apply a layer of mulch to stop the soil drying out

“For apples and pears, March is often the last opportunity to use secateurs and a saw on the canopy before the buds begin to grow.”

Lettuce, tomatoes and chilli: an early start with flavour

Those who want colourful salad bowls and home-grown tomatoes in summer should sow their first seeds in March.

Lettuce and leafy vegetables

From mid to late March, depending on the region, you can begin growing these crops:

• Cos lettuce and loose-leaf lettuce
• Spinach
• Mustard leaves
• Lamb’s lettuce for a later harvest

Combining direct sowing in beds with propagation in seed trays or modular trays is advisable. This ensures you have young plants ready later to fill any gaps in the bed.

Warm-weather crops: chilli and tomatoes

Chilli plants and tomatoes need a long growing period. Their seeds should therefore be sown early, but under protection in the house or greenhouse.

Plant	Sowing in March	Planting outdoors
Tomatoes	In seed trays on a bright, warm windowsill	After the final frosts, once night frost is no longer expected
Chilli / peppers	Sow early in warmth, ideally in an indoor propagator	In a sheltered location, for example in a container against a house wall

“Anyone who sows tomatoes and chilli in March will harvest considerably more in high summer – the plants remain productive for longer.”

Gardening in a changing climate: coping with heat and heavy rain

Springs are tending to become warmer, causing some plants to grow earlier. At the same time, periods of intense rain and dry weather are becoming more frequent. You can gradually adapt your garden to these conditions.

Making better use of water in the garden

• Collect rainwater in water butts or cisterns
• Mulch beds, for example with grass clippings, leaves or bark chips, to reduce evaporation
• Create raised or gently mounded beds so water drains more effectively
• Include small soakaway areas or shallow dips where heavy rainfall is likely

This helps plants remain supplied for longer in hot weather, while heavy rain is not simply washed away. Young seedlings are particularly sensitive to extreme fluctuations and benefit from every form of protection, whether fleece, mulch or a simple covering of polytunnel plastic.

In March, plan ahead for April and autumn harvests

A little forward planning spreads the workload over several weeks. April is when many warmth-loving plants become the focus, but initial preparations can be completed in March: mark out bed areas, spread compost, and clean pots and seed trays.

Keep crops intended for later harvests in mind as well. Sunflowers, pumpkins and courgettes begin their journey in many gardens in April, but March is ideal for planning the space and crop rotation they require. The same applies to strawberries: growing them in raised beds or hanging baskets significantly reduces slug damage. Specialist materials such as “Slug Wool” and other barriers often keep these crawling pests away effectively.

For beginners, a simple notebook or app can be worthwhile as a garden diary. Use it to record what you sowed and planted in March, which varieties germinated well, and which parts of the garden worked best. You will benefit from these observations next year, turning March from “starting chaos” into a perfectly timed beginning to the new gardening season.