So, when is the right time to plant tomatoes in Melbourne?

Melbourne is warming up, gardeners are getting their summer crops underway, and tomatoes are the talk of the town. Some gardeners around Melbourne already have their tomatoes in the ground. Others seem ready to pull the trigger.

So, is it the right time or worth holding off?

Ah, Melbourne spring. Four seasons in one day. And at least four opinions on when to plant a tomato.

The case for getting started

There are some pretty good reasons to be tempted. October is when warm-season crops start coming back onto the menu in Melbourne, and tomatoes are one of the stars of the show. Longer days, stronger sunshine and warming soil mean conditions are gradually becoming much more tomato-friendly.

If you've got a sunny, sheltered garden and your seedlings are looking healthy, you may be getting close. And there are benefits to getting an early start. Give your plants time to establish now and, ideally, you'll have bigger, stronger plants ready to make the most of summer. But there's just one problem. Melbourne hasn't quite signed off on summer yet.

The case for waiting

If you've spent more than an hour in Melbourne, you'll know the weather gods here like to keep things interesting. A warm afternoon can be followed by a very chilly night, and frost can still be a possibility in some parts of Melbourne through spring. Tomatoes don't particularly enjoy either.

And last week was a pretty good reminder of just how quickly things can change. Melbourne received around 50mm of rain in a matter of days, despite the fact that we're now well into spring.

Gardening Australia recommends waiting until the soil reaches at least 16°C, with 18–20°C being better, and until the risk of frost has passed.

There's a reason the old Melbourne Cup Day rule has stuck around. It's not an official tomato law handed down from the Department of Tomatoes. It's simply a useful rule of thumb for a city where spring weather can be spectacularly inconsistent . So the question isn't really:

“Is it October yet?”

It's:

“Is my garden ready?”

Your garden might be warmer than the one next door

This is where Melbourne's microclimates come into play.

A sunny north-facing courtyard surrounded by brick can warm up very differently from an exposed backyard in a colder pocket of the suburbs.

If your garden gets plenty of spring sun, is sheltered from cold winds and drains well, you might be able to get away with planting earlier.

If it's exposed, low-lying or slow to warm up, patience might be your best gardening tool.

Sadly, patience doesn't come in a seed packet.

Before you plant, check:

Sun

Tomatoes want plenty of it. Ideally, give them a good six to eight hours of direct sunlight.

Overnight temperatures

Don't just look at the daytime forecast. A lovely 22°C afternoon doesn't mean much if the temperature is going to plummet overnight.

Soil temperature

Cold soil can leave tomatoes sitting there wondering what they've done to deserve this.

Drainage

Especially after a wet spell, make sure your soil isn't staying soggy. Tomatoes like moisture, but they're not keen on living in a swamp.

Your seedlings

If they've been growing somewhere warm and protected, harden them off gradually before throwing them into the great outdoors.

Or… hedge your bets

You don't necessarily have to choose between plant everything now and wait until Melbourne Cup Day. You could plant a few and keep a few seedlings protected. That way, if Melbourne decides to serve up an unexpected cold snap, you've still got some players on the bench.

And if the weather behaves?

Congratulations. You're officially ahead of the game.

So, when should you plant tomatoes in Melbourne?

There isn't one magic date. If you've got a warm, sunny, sheltered garden, your soil is warming up and the nights are looking relatively friendly, you may be ready to start. If your garden is still cold and exposed, there's absolutely nothing wrong with waiting a little longer.

The important thing is to look at your garden, not just the calendar.

Because Melbourne's tomato season isn't really controlled by a date. It's controlled by the weather. And the weather, as anyone who has lived here for five minutes knows, does whatever the hell it wants.

In summary: If you're itching to plant, you're not alone. But don't let a sunny afternoon bully you into it. Check your garden, watch those overnight temperatures and give your tomatoes the conditions they actually want. A little patience now could mean a lot more tomatoes later.

And that seems like a pretty good deal to us.