What to plant in March in the UK

Use this march checklist as a seasonal starting point, then check local frost, weather and the needs of each species.

March checklist

• Pot on rooted plugs under cover.
• Begin hardening hardy plants on mild days.
• Keep frost protection ready for cold nights.

Plants we grow: what to do in March

• Coleus: Pot up indoors. A houseplant all year that can summer outside once frosts are over. Bring it back in before nights drop below about 10°C.
• Tradescantia, Callisia and inchplants: Pot up indoors, Take cuttings. Indoor trailing plants that can be potted up any month. Pinch and root the tips in spring and summer for bushier pots.
• Kalanchoe and Mother of Thousands: Pot up indoors. Succulent houseplants for a bright windowsill all year. Keep them on the dry side in winter. Toxic to pets.
• Cacti and trailing succulents: Pot up indoors. Pot up any month in gritty compost. Water sparingly from November to February while growth rests.
• Terrarium and foliage houseplants: Pot up indoors. Indoor and terrarium plants that can be planted any month. Keep them out of cold draughts and hot radiators in winter.
• English ivy: Pot up indoors, Plant outside. Hardy, so it can live indoors or go outside in spring or early autumn.
• Tomatoes: Grow on under cover. Tender. Plant in a greenhouse from April or outside once the last frost has passed.
• Broad beans: Plant outside. Hardy. Can go outside in early spring.
• Peas and mangetout: Plant outside. Hardy. Plant out in spring with twiggy supports.
• Leafy greens and brassicas: Plant outside. Hardy, cut-and-come-again leaves. Late summer plantings crop into autumn.
• Calendula (pot marigold): Plant outside. Hardy annual. Deadhead to keep the flowers coming.
• Cornflowers: Plant outside. Hardy and loved by pollinators. Plant out in spring.

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