What I Sow on a London Balcony in March

Early March is a time of reckoning for any balcony gardener in London. The wind still nips at your fingertips, and the soil in pots can feel downright cold. But there’s something quietly hopeful about that sharp breeze and the lengthening days – a promise that, yes, life will push through the early chill again.

I find March is when the balcony starts to stir into activity. Not all seeds are ready for it yet. But the ones that are? They’ve earned their place by resilience. Sweet peas, for one, and hardy lettuces. Maybe some scabious or cornflowers if your pots face a bit of shelter. These plants don’t just survive that wind; they wear it like a badge.

Before sowing, I give my containers a once-over — rinsing out old soil, refreshing with a light, well-draining mix. Lean soil for roots to stretch, but with enough moisture retention. It’s a balancing act. The pots on my balcony are all small — a nod to limited space, but also a challenge on windy days.

When wind sweeps across, it’s tempting to retreat indoors with your ambitions. But there’s a quiet joy in placing sturdy stakes or pairing whippy plants with neighbours who offer them shelter. Aromatics like thyme never fret over a breeze and add calm to the space. I always keep that in mind, especially when choosing what to sow early in March.

Container sowing this month is all about making space, controlling conditions, and starting slow. Pots need careful watering — too wet invites rot, too dry stalls growth. I use lightweight cloches or even simple glass jars for the most tender seedlings, giving them a warm start without crowding the balcony.

So what’s on my sowing list this March? Sweet peas (a classic, as much for smell as tenacity), hardy salad leaves like mâture or rocket, and some poppies for that cheerful splash of colour later in the summer. I try to combine the practical with the pretty — a few herbs, some flowers, all fitting neatly in their pots without a tussle.

If you’re after seeds that will handle the challenges of urban balcony life, look for varieties bred for container growing or those known for their toughness in British spring weather. Herboo’s urban seed collections have a thoughtful selection of these — which always saves me the trial and error.

That first ten days of March can feel slow. The seeds aren’t rushing to show themselves. But watch the soil closely. Look for that faint lift, or the very smallest green tip breaking surface.

And then… you know the momentum will build. The balcony will brighten, and the quiet promise held in those first March sowings will bloom out before long.