vegetables to plant in march

What Vegetables to Plant in March [What to Sow Inside, Outside]

The days are starting to get longer and warmer (honestly) in March and it’s a great time to REALLY get started in the vegetable garden.   This month you can not only continue starting some seeds off indoors – whether that’s a greenhouse, polytunnel or windowsill, but you can also plant some seeds directly into the ground – weather of course depending!  Some of the vegetables that we plant in March are those that need a long growing season, others – like one of our favourites, beetroot and salad we sow early so that we can start enjoying them in the late spring.  Here’s our guide to what vegetables to plant in March – inside, in the greenhouse, the polytunnel and also outside too.


What Vegetables to Plant in March

Somewhat warmer days, long days and spring flowers appearing means that its time to get to work in the vegetable garden.  You’ll be able to transplant some vegetables that you started earlier inside, and also sow vegetable seeds directly into the ground.  We’ve split this guide into what vegetables to plant outside in March and what vegetables to plant inside in March.

Vegetables to Plant Outside in March

I’ll preface this by saying you’ll need to watch the weather forecasts and ensure that the ground isn’t too waterlogged (or frozen) before planting any vegetable seeds outside in March.  But here’s what you can usually plant outside in March in the UK.

Plant Beetroot Outside in March

Beetroot can germinate in lower temperatures, so you can sow it outside directly into the ground in March.  Beetroot is one of the vegetables that we prefer to grow in pots – which means that we can sow and keep the young plants in the greenhouse if the weather is bad and then move it outside when the weather is better.  It’s also one of the vegetables that we also store for later by preserving (here’s how). 

Plant Onion Sets In March

You can plant out onion sets in March.  You’ll want to ensure that they are not shooting before you plant them.  Picking up discounted onion sets at the garden centre is a good way to save money by growing vegetables, but you’ll want to ensure that you reject any that are shooting.  This just means that they’ll bolt during the summer.  If you’ve started onions from seed, then you’ll want to plant them.

Plant Carrots in March

March is the best time to plant carrots.  We recommend planting them in pots and using succession sowing – plant up a container or two a week to get a good supply of carrots throughout the summer and autumn.  We love Chantenay carrots, which are a great variety to plant in pots – there’s more about growing carrots in our guide here.

Start Growing Asparagus from Crowns in March

You can grow Asparagus from seed and it is surprisingly easy to grow and it can save you a lot of money.  However, it is better (and easier) to grow asparagus from one-year-old plants – called crowns – and plant asparagus crowns in March (and April).   Asparagus grows best in a sunny site, but will also tolerate shade.  You’ll need well-drained soil or compost.  And you shouldn’t plant a bed previously used for asparagus to this year’s asparagus.  Rotate!  Harvest asparagus in its third year from mid-April for about 6 weeks.  After this third year, you can harvest for 8 weeks from mid-April. You can read our guide to growing Asparagus here.

Plant Rhubarb Outside in March

You can grow rhubarb easily from seed and plant directly into the ground, but you won’t be able to harvest from rhubarb plants until their second year.  That’s why we recommend growing rhubarb from year old plants called crowns.  That way you’ll skip having to wait a year and get to the good stuff of harvesting (and eating!) your rhubarb.  Rhubarb doesn’t react well to being transplanted, so you’ll want to try and plant it where it will live its life.  We like to grow rhubarb in pots so that we’re able to move the pots around depending on the weather.

Plant out Potatoes in March

If you’ve been chitting your first early potatoes then in mid to late March you can start planting them out.  It’s best (we think) to plant out at regular intervals so that you can have a regular ongoing harvest.  We recommend growing potatoes in potato growing bags – it’s such an easy way to grow potatoes and makes it seriously easy to manage and control.   Growing potatoes in bags mean that it’s easy to protect them from frost if the frost appears once they’ve developed shoots above the compost. Here’s all you need to know about how to grow potatoes in bags.

Vegetables to Plant in the Greenhouse, Polytunnel and Indoors

Plant Salad Leaves Indoors in March

Start planting salad leaves in March and continue to do this throughout the month.  Salad leaves and lettuce are a fabulous fresh veg to plant successively throughout the year, and you’ll want to keep doing this through July.  With some varieties ready to eat in just 21 days, you’ll find that salad leaves and lettuce will save you a packet when it comes to shopping – there’s more on how to save money with your garden here.  Salad leaves and lettuce are seriously quick wins when it comes to growing vegetables.  If you sow them continually from about March until September then you’ll get heaps of fresh veg direct from the garden and save a LOT of money compared to supermarket buying.   

Plant Tomatoes Indoors in March

We always start tomatoes on windowsill regardless of whether we have a polytunnel or greenhouse where we are living.  Since we started growing them some 12 years ago, its something of a habit now and a great way to start the growing season.  Tomatoes are also a fruit that we plant in succession so that we have a regular supply throughout the summer.  Dealing with gluts isn’t a problem though, over the years our chutney making kit has come in very handy. We’ll try and mix it up by trying new varieties, but our out and out favourites for taste and flavour are here.

Plant Chilli Seeds in March

Chilli plants will always cheer up your windowsills – and there are some great chilli growing kits available that will let you try out different chilli seeds without the need for buying large packets of seeds.   Chilli seeds will start the germinate in about 10 days after which point you’ll want to ensure they get enough warmth and that they’re watered regularly.  Be aware that the hotter a chilli rates on the Scoville scale the warmer the environment that the plant will need. 

Grow Mushrooms In March

Mushrooms are a particularly easy vegetable to grow and you can grow mushrooms in March and throughout the year.  There’s no need for a big investment when it comes to growing mushrooms and there are a variety of types that you can grow.  We particularly like chestnut mushrooms, but you can grow shiitake, oyster and plain white mushrooms at home quite easily.   With a mushroom growing kit (we wrote about the best ones here) you’ll be able to harvest your first mushrooms after about 3 weeks!

All our monthly vegetable planting guides

Final words on Vegetables to Plant in March

March is an exciting time in the vegetable garden.  It’s a great time to start many new vegetables in the garden and inside.  Whether you’re starting off vegetables inside – on windowsills, greenhouses or polytunnels – or outside in March, then there are a plethora of options available to you.   We love March in the vegetable garden, it’s a time of such hope and new beginnings, we hope you’ll love it too!

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