Ready to sow with confidence instead of crossing your fingers? March brings longer days and real momentum, but cold, wet ground can still undo good plans. We break down exactly what to start now under cover, what needs heat, and what should wait a week or two, so you save seed, time, and energy while setting up a strong season.

We begin with the crops that make March feel productive fast: salads like spring onions, spinach, radish, and a range of lettuces that thrive in plug trays and tunnels. Then we map out the cool-season backbone of a kitchen garden with brassicas and alliums, from cabbage and cauliflower to onions, shallots, and leeks. Root crops get nuanced advice: early carrots under cover, beetroot for a head start, and a realistic plan for parsnips when soil finally dries. For heat lovers—tomatoes, peppers, and chillies—we explain why steady night temperatures and a basic propagator make the difference between sturdy transplants and setbacks.

Herbs bring flexibility, with parsley and coriander on a little-and-often schedule and practical reasons to buy thyme, sage, and rosemary as small plants. We also time peas and broad beans for tidy module-grown transplants that beat slugs and claggy beds. Flowers round out the plan: sweet peas, cosmos, marigolds, lobelia, nasturtiums, and sunflowers for cheerful summer displays, plus summer bulbs and tubers like dahlias and lilies to anchor borders with bold colour. Throughout, we keep one principle front and centre: sow by conditions, not by the month on the packet. Protect tender seedlings, harden off with care, and wait for the soil to say yes.

If this guide helps you plan your March, share it with a gardening friend, subscribe for monthly sowing plans, and leave a review to help others find the show. What will you start first under cover this week?

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Until next week
Happy gardening
John