Browse this collection of flower seeds to sow in March if you’re hoping to fill your garden with colour and scent this summer. Early spring is the best time to propagate traditional favourites like marigolds, delphiniums, sunflowers and sweet pea seeds. For more tips on what flowers to plant in March in the UK, see our month-by-month flower seed guides.
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Growing flowers from seed is the ideal way to try something a bit different. Try Viola ’Blackjack’ with its inky blooms, Asarina ‘Formula Mix’, which has trumpet-shaped flowers, or our Cactus ‘Prickly Characters’ mix for some unusual perennials. You’ll find even more inspiration in our guide to flowers for tricky areas and helpful tips in the Frequently Asked Questions below.
Some of the best flower seeds to grow in containers include Lobelia ‘Monsoon’, Coleus ‘Rainbow Mixed’, Nasturtium ‘Bloody Mary’ and Lupin ‘Snow Pixie’.
Annual flower seeds like Ageratum ‘Blue Mix’ and nasturtiums will flower all summer if deadheaded regularly. You could also start marigolds and cosmos seeds this month, for long and colourful displays.
Nasturtiums and lobelia are both good choices for hanging baskets. Asarina seeds, also known as climbing snapdragons, are another beautiful option that create a voluptuous show in window boxes and baskets.