How to Grow Watermelon in Australia

Quick Guide: Growing Watermelon in Australia

  • Optimal Growing Temperatures: Between 21°C and 35°C.
  • Ready to Harvest: 12-17 weeks after planting.
  • Space Between Plants: Ensure 60 - 75 cm apart.
  • Companion Plants: Corn... See More
  • Plants to Avoid: Potatoes... See More
  • Plant Type: Seed

When to Plant Watermelon in Australia

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Best planting months for Watermelon in the Tropical regions are March, April, May, June, July.

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For the Subtropical region, Watermelon can be planted from January to February and July to December. Cities in the Subtropical region include Brisbane, Central Coast, and Sydney.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec


Watermelon can be from August to December in the Temperate regions of Australia. Cities in the Temperate region include Melbourne, Adelaide, Geelong, and Perth.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec


For the Cool region, Watermelon can be planted from September to November. Cities in the Cool region include alpine regions of Victoria and Tasmania.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec


Best planting months for Watermelon in the Arid region are February, March, April, October, November, December.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

One of the primary advantages of growing watermelon at home is the ability to choose from a wide variety of options. While supermarkets often offer limited choices, cultivating watermelon in your own garden allows you to experiment with different flavours, sizes, and colours. Whether you prefer the classic seeded varieties or the convenience of seedless watermelons, there is a perfect option out there waiting for you. By selecting the right variety, you can tailor the growing experience to your personal preferences and ensure a bountiful harvest.

Selecting the Right Watermelon Variety

When it comes to growing watermelon at home, selecting the right variety is crucial for a successful harvest. With so many options available, it can be overwhelming to choose the perfect watermelon for your garden. However, by considering factors such as seed type, size, climate, and space availability, you can make an informed decision that will set you up for juicy, sweet fruits that will make your taste buds dance with delight.

Seedless or Seeded?

One of the first choices you'll encounter when selecting a watermelon variety is whether to go for seedless or seeded fruits. Seedless watermelons are a popular choice for many gardeners due to their convenience. These varieties produce fruits with small, underdeveloped seeds that are barely noticeable when consumed. Seedless watermelons are known for their sweet and juicy flesh, making them a favourite among fruit lovers. On the other hand, if you enjoy the tradition of spitting out watermelon seeds on a lazy summer day, then seeded varieties might be more to your liking. Seeded watermelons often have larger fruits and can be just as delicious as their seedless counterparts.

Choosing the Ideal Size

Watermelons come in a range of sizes, from petite personal melons to massive fruits that can weigh up to 50 pounds or more. When selecting a watermelon variety, consider the needs of your household and the available space in your garden. Personal-sized watermelons are perfect for individuals or small families, as they are easier to handle and require less space to grow. If you have a larger family or enjoy sharing the bounty with friends and neighbours, opt for larger varieties that can provide ample fruit for everyone to enjoy.

Considering Climate and Space

Watermelons thrive in warm climates, requiring plenty of sunshine and heat to develop their sweet flavours. Before selecting a watermelon variety, consider the climate in your region. Some varieties are better suited for cooler climates, while others excel in hot and humid conditions. Additionally, take into account the available space in your garden. Some watermelon varieties have a sprawling growth habit, taking up a significant amount of room. If you have limited space, look for compact or bush varieties that can be grown in containers or smaller garden beds.

By carefully selecting the right watermelon variety, you can set yourself up for a successful and delicious harvest. Whether you prefer seedless or seeded fruits, choose the ideal size, or consider the climate and space in your garden, there is a watermelon variety out there that will meet your needs. So, get ready to enjoy the refreshing taste of homegrown watermelon all summer long!

Next up: Preparing the Soil: Soil Testing, Amending Soil with Compost, Providing Proper Drainage

Preparing the Soil

Before embarking on the journey of growing luscious watermelons at home, it is crucial to prepare the soil to provide the ideal conditions for their growth. A well-prepared soil not only promotes healthy plant development but also ensures a bountiful harvest. In this section, we will explore the essential steps to prepare the soil for cultivating watermelons.

Soil Testing

To lay a solid foundation for successful watermelon cultivation, one must begin with a soil test. Soil testing is an invaluable tool that provides valuable insights into the soil's nutrient composition, pH levels, and overall health. By understanding the specific requirements of your soil, you can make informed decisions about the necessary amendments and fertilisers that will optimise watermelon growth.

Conducting a soil test involves collecting samples from different areas of your garden and sending them to a reputable soil testing laboratory. The results will provide detailed information about the levels of essential nutrients such as nitrogen, phosphorus, and potassium, as well as secondary nutrients and micronutrients. Armed with this knowledge, you can tailor your soil preparation efforts to meet the specific needs of watermelon plants.

Amending Soil with Compost

One of the key steps in preparing the soil for watermelons is enriching it with organic matter, and there is no better source of organic matter than compost. Compost is the black gold of gardeners, teeming with beneficial microorganisms, essential nutrients, and a crumbly texture that improves soil structure.

To amend the soil with compost, spread a layer of compost over the designated watermelon planting area and incorporate it into the soil using a garden fork or tiller. Aim for a depth of at least six inches (15 cm) to ensure thorough mixing. This process will enhance the soil's fertility, improve its water-holding capacity, and promote the growth of beneficial soil organisms.

Providing Proper Drainage

Good drainage is a vital aspect of soil preparation for watermelon cultivation. Watermelons thrive in well-drained soil, as excessive moisture can lead to root rot and other detrimental conditions. To ensure proper drainage, it is important to assess the natural drainage characteristics of your garden and take appropriate measures if necessary.

If your garden has heavy clay soil that tends to retain water, consider incorporating organic matter such as compost, peat moss, or aged manure. These amendments will improve the soil's structure and porosity, allowing water to flow freely and preventing waterlogged conditions. Additionally, raising the planting bed slightly can help improve drainage, especially in areas prone to water accumulation.

On the other hand, if you have sandy soil that drains too quickly, incorporating organic matter will help increase its water-holding capacity. Mulching around the watermelon plants can also be beneficial, as it helps retain moisture and prevents rapid evaporation.

By taking the time to prepare the soil properly, you are setting the stage for a successful watermelon-growing adventure. Soil testing, amending with compost, and providing proper drainage are essential steps that will ensure the optimal conditions for your watermelon plants to thrive. So roll up your sleeves, put on your gardening gloves, and let's get the soil ready for some juicy, homegrown watermelons!

Planting Watermelon Seeds

Once you've selected the perfect watermelon variety for your home garden, it's time to get your hands dirty and plant those seeds. Whether you choose to start the seeds indoors or directly sow them in your garden, this section will guide you through the process with expert tips and techniques.

Starting Seeds Indoors

If you're eager to get a head start on your watermelon growing journey, starting the seeds indoors is a great option. This method allows you to provide optimal conditions for germination and early growth. Here's how to do it:

  1. Gather your supplies: You'll need seed starting trays or pots, seed starting mix, water, and of course, your watermelon seeds. Make sure the containers have drainage holes to prevent waterlogging.
  2. Prepare the seed starting mix: Fill the trays or pots with a high-quality seed starting mix. This type of soil is lightweight and fertile, providing the ideal environment for young seedlings.
  3. Plant the seeds: Create small indentations in the soil with your finger, about 1 inch deep. Place a couple of seeds in each hole, then cover them with soil and gently press down to ensure good soil-to-seed contact.
  4. Provide proper moisture: Water the soil gently, ensuring that it is evenly moist but not waterlogged. Remember, watermelon plants love water, but excess moisture can lead to rotting.
  5. Create a warm environment: Place the seed trays or pots in a warm location, such as near a sunny window or under a grow light. Watermelon seeds germinate best at temperatures between 75-85°F (24-29°C).
  6. Monitor and care for the seedlings: Keep a close eye on the seedlings as they emerge. Once they have grown their first set of true leaves, thin them out to leave only the strongest seedling in each container.
  7. Harden off the seedlings: About a week before transplanting the seedlings outdoors, gradually expose them to outdoor conditions. Start by placing them outside for a few hours each day, gradually increasing the time over the course of a week. This process helps the seedlings adjust to the outdoor environment.

Direct Sowing in the Garden

If you prefer a more direct approach, you can sow your watermelon seeds directly in your garden. This method eliminates the need for transplanting and allows the plants to establish themselves in their permanent location from the start. Follow these steps for successful direct sowing:

  1. Prepare the soil: Choose a sunny spot in your garden with well-draining soil. Remove any weeds or debris, and loosen the soil to a depth of about 8-10 inches. Watermelon plants thrive in loose, fertile soil.
  2. Create hills or mounds: Watermelons appreciate well-drained soil, so create hills or mounds to improve drainage. Form small mounds of soil about 12-18 inches in diameter and 6-8 inches high. Space the mounds about 6 feet apart to allow the plants ample room to grow and spread.
  3. Plant the seeds: Make small holes in the top of each mound, about 1 inch deep. Place a couple of seeds in each hole, then cover them with soil and gently firm it down. Leave about 2-3 feet of space between each seed mound.
  4. Water thoroughly: After planting the seeds, give the soil a good soaking. This will ensure that the seeds have enough moisture to germinate. As the seedlings emerge, continue to water regularly, keeping the soil consistently moist but not waterlogged.

By following these planting methods, you'll be well on your way to cultivating your own succulent watermelons at home. Whether you choose to start the seeds indoors or directly sow them in your garden, remember to provide adequate care and attention as your watermelon plants grow. Stay tuned for the next section on Watering and Fertilising, where we'll delve into the essential practices for nourishing your watermelon plants and promoting their vigorous growth.

Watering and Fertilising

When it comes to growing watermelons, watering and fertilising are two crucial aspects that can make or break your harvest. By providing the right amount of water and nutrients, you can ensure healthy plant growth and maximise the sweetness of your watermelons. In this section, we will delve into the proper watering techniques, fertiliser requirements, and managing soil moisture to help you master these essential tasks.

Proper Watering Techniques

Water is the lifeblood of any plant, and watermelons are no exception. To keep your watermelon plants happy and hydrated, it is important to follow some proper watering techniques. First and foremost, it is important to water your plants deeply and infrequently. This means providing a thorough watering once or twice a week rather than shallow watering every day. Deep watering encourages the roots to grow deeper into the soil, making them more resilient to drought conditions.

During the early stages of growth, when the plants are establishing their root systems, it is crucial to keep the soil consistently moist. As the plants mature, you can gradually reduce the frequency of watering. However, during hot and dry periods, it is important to monitor the soil moisture closely and adjust your watering schedule accordingly.

To prevent overwatering and ensure proper drainage, it is recommended to water the plants at the base rather than from above. This helps to avoid wetting the leaves and fruit, which can increase the risk of disease. Additionally, using a soaker hose or drip irrigation system can help deliver water directly to the root zone, minimising water loss through evaporation.

Fertiliser Requirements

Watermelons are heavy feeders, meaning they require an ample supply of nutrients to thrive. Before planting, it is essential to prepare the soil by incorporating organic matter such as compost or well-rotted manure. This helps improve the soil's fertility and provides a slow-release source of nutrients for the plants.

During the growing season, it is important to provide additional fertiliser to meet the watermelon's nutrient requirements. A balanced fertiliser with equal amounts of nitrogen (N), phosphorus (P), and potassium (K) is generally recommended. However, it is important to avoid excessive nitrogen, as it can promote excessive foliage growth at the expense of fruit development. Instead, focus on providing a moderate amount of nitrogen to support healthy plant growth and fruit production.

To determine the specific fertiliser requirements for your watermelon plants, it is recommended to conduct a soil test. This will help you understand the nutrient levels in your soil and allow you to make informed decisions about the type and amount of fertiliser to apply. Generally, a side dressing of fertiliser around the base of the plants every three to four weeks during the growing season is sufficient to meet their needs.

Managing Soil Moisture

Maintaining proper soil moisture is essential for healthy watermelon plants. While watermelons require regular watering, it is important to strike a balance and avoid overwatering, as it can lead to root rot and other water-related issues. On the other hand, underwatering can result in stunted growth and poor fruit development.

One effective way to manage soil moisture is by applying a layer of organic mulch around the base of the plants. Mulch helps to retain soil moisture, suppress weeds, and regulate soil temperature. It also acts as a barrier, preventing water from evaporating too quickly from the soil surface.

Monitoring the soil moisture levels is crucial to ensure optimal growing conditions for your watermelon plants. You can use a moisture metre or simply stick your finger into the soil to check its moisture content. Ideally, the soil should be moist but not waterlogged. Adjust your watering schedule accordingly to maintain the right balance.

By mastering the art of proper watering techniques, understanding the fertiliser requirements, and effectively managing soil moisture, you can ensure robust growth and sweet, juicy watermelons. So go ahead and put your newfound knowledge into practice, and soon you'll be enjoying the fruits of your labour. Happy gardening!

Pruning and Trellising: Nurturing Watermelon Growth

As any seasoned gardener knows, tending to plants is a delicate dance of nurturing and guiding them towards their fullest potential. When it comes to watermelons, this is especially true. Pruning and trellising play a crucial role in controlling plant growth, supporting heavy fruits, and enhancing air circulation, ultimately leading to a bountiful harvest. In this section, we will explore the art of pruning and trellising, ensuring that your watermelon plants thrive.

Controlling Plant Growth: The Art of Pruning

Pruning is an essential technique that allows you to shape and direct the growth of your watermelon plants. By selectively removing unwanted shoots, leaves, and branches, you can help the plant focus its energy on producing larger and sweeter fruits.

But how do you know what to prune? It's simple! Begin by identifying the main stem, also known as the leader. This central stem is the backbone of your watermelon plant's growth. From here, you'll want to remove any secondary shoots that develop at the base of the plant or along the main stem. These shoots, also known as suckers, divert valuable nutrients away from the main stem and can hinder fruit development.

Remember: Pruning should be done with care and precision. Use clean, sharp pruning shears to make clean cuts, minimising the risk of introducing infections or damaging the plant.

Supporting Heavy Fruits: The Role of Trellising

As watermelon plants grow and develop, their fruits can become quite substantial, weighing down the vines and potentially causing them to break or snap. This is where trellising comes into play. By providing a sturdy support system for your watermelon vines, you can prevent fruit damage and create a more organised and manageable garden space.

Trellising involves the use of a structure, such as a trellis or a mesh netting, to elevate the vines off the ground and provide them with a strong framework to climb. As the vines grow, gently guide them towards the trellis and use soft ties or twine to secure them in place. This method not only prevents the fruits from resting on the soil, reducing the risk of rot and pests, but also promotes better air circulation around the plant.

Pro tip: When selecting a trellis, opt for a design that can withstand the weight of the watermelon fruits. Sturdy materials such as metal or wood are ideal choices.

Enhancing Air Circulation: A Breath of Fresh Air for Watermelon Plants

Just like humans, plants need fresh air to thrive. Adequate air circulation is crucial for preventing the buildup of moisture and reducing the risk of fungal diseases that can harm your watermelon crop. Pruning and trellising go hand in hand in creating an environment that fosters good airflow.

By pruning away excess foliage and guiding the vines upwards on a trellis, you allow air to move freely through the plant. This helps to prevent the growth of mildew and other fungal infections that thrive in humid conditions. Additionally, improved air circulation assists in pollination, ensuring a higher fruit set and a more abundant harvest.

Keep in mind: When pruning, be mindful not to remove too much foliage, as leaves are essential for photosynthesis, the process by which plants convert sunlight into energy.

By mastering the art of pruning and trellising, you are setting the stage for a flourishing watermelon garden. Remember, this is just one piece of the puzzle. 

Pest and Disease Control

When it comes to growing watermelons at home, ensuring the health and vitality of your plants is of utmost importance. Just like any other plant, watermelons are susceptible to a variety of pests and diseases. However, with proper knowledge and preventive measures, you can protect your watermelon crop and ensure a bountiful harvest.

Common Watermelon Pests

Watermelons can fall victim to a number of pests that can wreak havoc on their growth and development. Some of the most common pests that you may encounter include aphids, cucumber beetles, squash bugs, and spider mites. These pests can cause damage to the leaves, stems, and fruits of your watermelon plants, leading to stunted growth and reduced yields.

To combat these pests, it is important to monitor your plants regularly for any signs of infestation. If you spot any of these pests, you can employ natural and organic solutions to control their population and prevent further damage.

Natural and Organic Solutions

When it comes to dealing with watermelon pests, it is always best to opt for natural and organic solutions. These methods not only help protect the environment but also ensure the safety of your fruits for consumption.

One effective natural solution is companion planting. By planting certain herbs and flowers alongside your watermelon plants, you can repel pests and attract beneficial insects that will help control pest populations. For example, planting marigolds or nasturtiums near your watermelons can deter aphids and cucumber beetles.

Another natural solution is homemade insecticidal soap. This mixture, made from mild soap and water, can be sprayed onto your plants to suffocate and kill pests like aphids and spider mites. Just be sure to follow the proper recipe and dilution instructions to avoid damaging your plants.

Preventive Measures

Prevention is often the best defence against pests and diseases. By taking proactive measures, you can minimise the risk of infestation and keep your watermelon plants healthy.

One important preventive measure is crop rotation. Avoid planting watermelons in the same location year after year, as this can create an environment that is conducive to pests and diseases. Instead, practice crop rotation by planting watermelons in different areas of your garden each year. This will help disrupt pest life cycles and reduce the likelihood of infestation.

Additionally, maintaining proper sanitation in your garden is crucial. Remove any fallen leaves, fruits, or debris from the ground, as these can serve as breeding grounds for pests and diseases. Regularly inspect your plants for any signs of damage or disease, and promptly remove any affected parts to prevent the spread.

By following these pest and disease control measures, you can ensure the health and productivity of your watermelon plants. With a little care and attention, you will be rewarded with juicy and delicious fruits that you can enjoy all summer long.

Harvesting and Storing

After months of careful nurturing and tending to your watermelon plants, the time has finally come to reap the sweet rewards of your labour. Harvesting and storing watermelons requires a delicate touch and a keen eye for ripeness. In this section, we will explore the key considerations for determining ripeness, as well as the best techniques for harvesting and storing these delectable fruits.

Determining Ripeness

To truly savour the deliciousness of a watermelon, it is crucial to harvest it at the peak of its ripeness. But how can you tell if a watermelon is ready to be plucked from the vine? There are a few telltale signs to look out for:

  1. Thumping: Gently tap the watermelon with your fingers. A ripe watermelon will produce a deep, hollow sound, whereas an unripe one will sound dull.
  2. Colour and Texture: Inspect the watermelon's skin. A ripe watermelon will have a vibrant, uniform colour. The skin should be smooth, without any blemishes or soft spots.
  3. Tendril Drying: Examine the tendril closest to the fruit. If it has turned brown and withered, it is a good indication that the watermelon is ripe and ready to be picked.

By combining these methods, you can ensure that each bite of your homegrown watermelon bursts with juiciness and sweetness.

Harvesting Techniques

Once you have determined that your watermelon is ripe, it's time to carefully remove it from the vine. To avoid damaging the fruit, follow these tried-and-true harvesting techniques:

  1. Use Pruning Shears: Equip yourself with a pair of sharp pruning shears or a clean knife. Cut the watermelon stem with a clean, diagonal cut, leaving a few inches of stem attached to the fruit. This will help to preserve its freshness and extend its shelf life.
  2. Handle with Care: Handle the watermelon gently to prevent any bruises or punctures. Remember, these fruits can be surprisingly heavy, so use both hands and support the fruit from underneath as you lift it.
  3. Enlist a Helping Hand: If you're dealing with particularly large watermelons, don't hesitate to ask for assistance. Teamwork ensures that the fruit remains intact and undamaged during the harvesting process.

Storing Watermelon

Now that you've successfully harvested your watermelon, it's time to think about storage. Proper storage techniques will help prolong the fruit's freshness and preserve its mouthwatering taste. Here are a few tips to keep in mind:

  1. Cool and Dry: Store your watermelon in a cool, dry place. A temperature range of 50 to 60 degrees Fahrenheit (10 to 15 degrees Celsius) is ideal for maintaining its quality. Avoid placing it in direct sunlight or near other fruits that emit ethylene gas, as this can accelerate ripening and spoilage.
  2. Refrigeration: If you plan to consume your watermelon within a few days, refrigeration is the way to go. Wrap the fruit tightly in plastic wrap or place it in an airtight container to prevent moisture loss and maintain its juiciness. Remember to bring the watermelon to room temperature before serving to enhance its flavour.
  3. Freezing: If you have an abundance of watermelon or want to enjoy its refreshing taste during the off-season, consider freezing it. Cut the watermelon into bite-sized chunks or blend it into a refreshing sorbet. Seal the pieces in an airtight container or freezer bag, ensuring they are completely dry to prevent freezer burn.

By following these guidelines, you can relish the flavours of your homegrown watermelons long after the harvest season has come to an end.

As you can see, harvesting and storing watermelons is a rewarding process that requires attention to detail and a sprinkle of patience. By mastering these techniques, you can enjoy the fruits of your labour and share the succulent joy of homegrown watermelons with family and friends.

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