Growing Tomatoes in The Tropics

This post is about my experience and things I’ve learned growing tomatoes in the tropics. Yes, of course you can grow tomatoes in the tropics, but it’s a little different to growing cherry, heirloom, grape, beefsteak and slicer tomatoes in more temperate climates. I grew up growing tomatoes in a temperate environment, where winters didn’t support tomato growing. In the tropics you can grow tomato plants all year round, just about, and they’ll grow as perennials endlessly giving you cuttings for new plants. It’s not totally easy and some times of year are better for growing tomatoes than others, but here are a few tips and tricks for growing, planting, and sewing tomatoes in a hot country in summer and winter, wet monsoon season and dry season.

Food Plants That Grow in The Tropics
Food Plants That Grow in The Tropics
Cherry tomatoes, growing in a container in my tropical food garden in mid-May. That’s our late autumn. A little bit of European (sweet) basil there as a companion. Some are planted with marigolds.

Growing Tomatoes in The Tropics

Should You Plant Seeds or Buy Tomato Plants?

Either is absolutely fine but seeds will give you dozens of plants for the cost of one larger plant from the garden centre or nursery. Tomatoes actually like to be transplanted and sunk into their permanent home deeper, so we don’t worry too much about transplantation shock with tomatoes. But why not get your tomato plants for free?

I find when buying seed that it’s best to buy online from a specialist seed vendor. Seeds from supermarkets have a tendency to not germinate sometimes. But, if they’re all you can get, grow them. Work with what you’ve got, always.

How To Get Tomato Plants For Free

rooting in water growing tomatoes in the tropics from cuttings
Tomato plants form roots really easily in water in a tropical climate. Just keep them out of the direct sun and sink them deep. As you can see above they root all along their stems from little nodules. These are ready to pot up but could also have been potted up much earlier. Your tomato cuttings will likely root just as well in soil, out of the direct sun, so long as you keep the soil moist and don’t forget to water them.

Do you have tomatoes in your fridge? Take the seeds and plant them. You never know, some might grow. Some people dry them and ferment the jelly off but in my experience, they grow straight from the fruit. You’d be amazed how many plants you can grow for free from store-bought food.

Alternatively, do you have a friend or neighbour who grows tomatoes? Ask very nicely for a cutting and they may be able to give you a few. You see, most tomatoes need pruning. They tend to throw out side shoots from their “armpits” that most gardeners will remove to keep the plant more open. These side shoots root really easily if you pop them in a jam jar of water for a few days.

Once you see some nice roots forming just pot them up, nice and deep. Keep them out of direct sun for a few days until those roots get a grip and are able to take up as much water as your newly propagated tomato plants will need in the heat.

What time of Year To Plant Tomatoes in The Tropics?

Now is a good time. Now is always a good time. If you have seeds, plants, or cuttings, just plant them up and nurture them. For sure, some times are better than others. Check the date from sewing to first fruit on your seed packet. Aim to plant the seeds so that masses of fruit will be ripening in early spring into early summer. The time from sewing to fruiting for tomato plants is in the region of 60 to 80 days. This time varies with the variety of tomato.

Where in the tropics do you live? Our old home just 16 degrees from the equator allowed us to germinate tomato seeds and grow tomato plants year-round. Our new home, in the same tropical location, but at a greater elevation, is cooler. Germinating tomato seeds needs some extra warmth in winter and although the tomato plants grow and set some fruit through winter, they really start to thrive and produce masses of fruit in early spring.

Scorching dry season heat and lack of rain will make your tomato’s life harder, monsoon deluges likewise, but I’ve had success growing tomatoes from seeds, cuttings, and starts at just about any time of year in a hot tropical environment at sea level.

Throw the rules out the window, just grow them. As I said already tomatoes often grow as perennials in the tropics, I have tomato plants that are three years old and many are clones from cuttings so, technically, the same plant.

The easiest times to grow tomatoes would be the less extreme times of year, not too hot, not too wet, not too dry, not at the coldest time of year.

I get my best tomato harvest in July, August and September, usually. Our tropical winter here never gets so cold that tomato seeds refuse to germinate. (Until moving to a property at a greater elevation, where temperatures dropped significantly). September is technically the first month of spring here.

What’s the “Official” Best Time to Plant Tomato Seeds in Tropical Australia?

At the end of summer, once the wet season has done its worst is the time most gardeners recommend planting tomato seeds in the tropics. The best months to sew tomato seeds are April and May. (in Australia, or the Southern Hemisphere)

Tomato seedlings should then be planted out 4-6 weeks later, in June and July.

Look at your seed packet to find how many weeks later your variety of tomato produces fruit.

Tomatoes like growing during the cooler months in a tropical climate, but if you can give them some shade and protection from the heat and the wet, I’ve had moderate success year-round. Cherry tomatoes seem to be the easiest to grow.

I haven’t bought tomatoes at the store in over 2 years. That goes for tinned tomatoes for cooking too.

What Varieties of Tomato Can You Grow in The Tropics?

I’ve not yet found one I couldn’t grow. At first, I had more success with cherry tomatoes than larger varieties but as my tomato handling expertise grew (particularly my soil know-how) I found that really I could grow anything.

My favourites and most productive varieties are roma (plum) tomatoes for cooking, black Russian, a slicer, for just being beautiful and impressive, black grape, a nice purple cherry and a nameless random cherry that’s been giving us abundant food for years. I have no idea what variety it is nor where it came from.

A new one I’m growing this year is a pineapple tomato, these are delicious, large, yellow/peach tomatoes. They’re not massively productive as yet but each fruit is a treasure.

How To Look After Your Tomato Plants

Holes in tomatoes Tomato pests in the tropics caterpillars
What’s making holes in your tomatoes? It could be this grub or caterpillar. Destroy on site. You’ll normally see just a round hole, the caterpillar emerges now and then. Other creatures that make holes in tomatoes include rats and mice.

Plants need sunshine, water, nutrients, and good soil. Good soil contains microorganisms, fungi, worms, and decaying matter, it holds moisture well. Really, gardening is all about growing good soil.

You’ll hear talk of tomatoes needing specific nutrients, potassium, nitrogen, calcium, and so on. And what about dolomite, blood and bone, and fish emulsion? Relax, it’s not hard and nothing to be scared of.

Keep your soil moist. This might mean you have to water them twice a day when it’s hot and dry, it might mean never in the wet season. Just keep the soil moist.

Don’t ever water plants in full sun if you can help it, and try not to splash water on leaves in the sun, this can burn them.

Wilting is normal, it’s the plant’s natural defence against dehydration, but if your plant goes beyond a mild wilt it could die. We don’t want that. Also, tomatoes don’t like to be sopping wet. Mine mostly survive the wet season, but they don’t like it. I raise mine in pots or raised beds so that they’re not sitting in a puddle for weeks.

Plants need a mixture of all the nutrients and minerals, just as we do. The following four elements are important in growing tomatoes.

  • Nitrogen grows plants, it grows big, healthy leaves and stems. Nitrogen is the building block of amino acids and proteins. Niotrogen is found in well rotted organic matter, manure, compost, and very dilute urine.
  • Potassium helps fruit and flowers grow. It facilitates transport within plants.
  • Phosphorous is needed for photosynthesis, respiration, and growth
  • Magnesium. Did you wonder why gardeners put Epson Salts in their garden beds? Plants need it. Yellowing can be caused by lack of Mg.
  • Calcium prevents bottom (AKA blossom) end rot. I add dolomite to prevent this.
growing tomatoes up a fence
You can support your tomato plants in many ways. Can you grow them up a pool fence? Well no, not really, it’s a safety risk, there are laws about plants and how much weight they can take near a pool fence. A child shouldn’t be able to use them to climb over the fence. Check your local laws. I prefer to use bamboo poles, the longest ones you can find. Then tie them on with gardeners’ twine, natural, not plastic.

Tomatoes will also need support. Flimsy tomato cages are useless, don’t buy those. Tomato plants can get absolutely enormous, higher than the house, so they will need support.

I use canes (longer the better) and string and I’m experimenting with growing them up strings. However, my favourite tactic is to plant determinate tomatoes (like romas) rather than indeterminate, they’re just more manageable.

Some of the indeterminate cherries sprawl on and on. I have to keep cutting them back to size. Where a tomato stem touches the ground it will likely root in moist humid conditions, this is how they would grow if they were still wild. If your fruit is too low it can rot and, often, be eaten by rats and mice. I wish my cats could go outdoors to help with that!

Most gardeners prune their tomato plants, nipping out side shoots from the “armpits”. Some will prune them to a single stem and take off all old yellowing and browning leaves. It depends on how seriously you’re taking it really. Pruned or not, you’re likely to get some tomatoes to harvest. Not pruning the plants gives pests and diseases more places to hide out and grow. Watch out for bugs and caterpillars, check your plants daily. Squish bugs or brush them into a bucket of soapy water. I don’t like to use pesticides or DE that could harm my bees.

Every year you grow tomatoes you will become better at it. Watch, learn, observe, grow your tomato growing super powers.

New Plants Need To Be Looked After More

Young plants, seedlings, and newly rooted cuttings are like babies and you have to nurture them. They won’t yet have a robust root system to access all that water and all those nutrients. They might have a lot more green than they do root. This will make them much more likely to dehydrate in the heat. Keep a close eye on them. Maybe keep them out of the sun when it’s very hot or move them undercover in torrential rain. This is easy in pots.

Generally, the bigger the pot and the better the soil or compost it contains, the more fabulous your tomatoes will be. Keep their soil moist but not soggy. Some people pinch off the first flowers so that the second bunch of blossoms will be on a stronger plant. I don’t, I’m always far too excited about the prospect of tomatoes. You see, there really is no 100% right way and wrong way. You don’t have to grow tomatoes the perfect way, just do what works.

At What Time Of Year Will Your Tomatoes Bear Fruit

I don’t think I’ve yet had a month with no tomatoes. They struggle in the wet, but still, there are usually a few.

My most productive time for tomato harvesting is after the wet season, to the start of the wet season. Any time but the wet season!

Optimum time seems to be about May onwards, our autumn into winter and spring. My tomatoes, just 16 degrees south of the equator, don’t like the hot, wet, humid summers at all. Pests are a major issue for me and my tomatoes in the wet. But I obstinately refuse to use pesticides or anything artificial on my garden. My best and only bug defense is squishing.

Tomatoes will struggle in the dry season if their soil is not good and you don’t keep them consistently damp. In very dry conditions I need to water morning and evening and a thick layer of mulch helps water retention. Good soil, that holds water and contains plenty of organic matter will help tomato plants thrive in the dry season. Some shade won’t hurt them either.

What To Do With All Those Tomatoes?

Any tomatoes that we don’t eat fresh and raw, on the day, I cook or freeze to use later. I don’t do canning or bottling because we don’t have a winter to get through.

I simply chop my tomatoes in half or dice them smaller, and throw them in a bag in the freezer. I can add to, or take tomatoes from that bag day by day.

These are the reusable silicone freezer bags I use for all my garden produce. They’re a solid investment. Reusable plastic bags generally don’t last long. The stand that comes with these bags is invaluable for washing and drying and I put these in the dishwasher with no problems.

You can freeze cherry tomatoes, plum, salad, or beefsteak for cooking. They all freeze just fine.

Tomatoes freeze well for cooking. I can then use them to make any tomato-based sauce, soup, or casserole. I do not remove the skins as for a smooth tomato sauce (for pizza or pasta) I run them through the blender once cooked. It’s amazing how much garden produce you can freeze, I often have bags of bananas, aubergines, peppers, and chopped chilly peppers frozen too.

We also ferment, and dry. Both are possible with tomatoes and a few tomatoes in a fermented chilly sauce (hot sauce) is a great addition!

I’ve been sharing photos of my garden to Instagram for a few years now, I can easily look back and say yes, on that day last year I was picking tomatoes. I need to go back and check. Sometimes I even share daily harvest photos. Today it is mid-May, my main tomato harvest time is just beginning and things are looking really exciting out there, but also I’m starting new tomato plants from seed and cuttings. They should also be fine. As with every post on this site, this one will evolve, grow, and bloom. This is my hobby, my notes, my know-how. I am a scientist by training, a biologist actually. I experiment, test, and make notes. Welcome to my notebook.

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