March can feel like four seasons in a week, and that’s exactly why an April seed sowing guide is so useful. We sit down with the reality of spring weather swings and turn them into a practical plan: what to sow now under cover, what to hold back until soils warm, and how to stay flexible so you don’t waste seed or stall your garden momentum.

We run through a packed “what to sow in April” list for the vegetable garden, starting with reliable salads like lettuce, spring onions, spinach, radish and rocket, then moving into brassicas, peas and beans, and the root crops that start to make sense as beds dry out. We also share timing notes for onions and leeks, the value of multi-sowing, and why fresh parsnip seed matters more than people realise. For warm-season crops like tomatoes, cucumbers, courgettes and squash, we talk about the late-but-still-possible window and the importance of steady warmth.

Seedlings don’t love extremes, and we unpack a common spring problem: huge temperature variance in a greenhouse or polytunnel that can leave young plants looking sorry for themselves. You’ll also hear a simple way to keep harvests coming with microgreens, even when outside is still stop-start.

On the ornamental side, April is where annual flowers really kick off, with options like cosmos, sunflowers, nasturtiums, cornflowers and nigella, plus a great case for growing dahlias from seed and planting bulbs and tubers for summer colour. 

Grow Your Own Herbs Workshop: 

We finish with a look at upcoming workshops, including a herb-focused day with Laura Darcy of Yarrow lane Herbs that connects growing with real-world uses like teas and home remedies.

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Until next week  
Happy gardening  
John