Tips for Growing Watermelon in Arizona: From Planting to Harvesting

By: Carolyn J. Vance

Tips for Growing Watermelon in Arizona: From Planting to Harvesting

Growing watermelon in Arizona can be a challenging but rewarding experience. With its hot and dry climate, Arizona provides unique conditions for cultivating this juicy and refreshing fruit. By following a few key tips and techniques, you can successfully grow watermelon in your Arizona garden or backyard.

2. Prepare the soil: Before planting your watermelon seeds, it is crucial to prepare the soil properly. Start by removing any weeds or grass from the planting area. The soil should be loose and well-draining, as watermelons do not thrive in wet or soggy conditions. Consider adding compost or organic matter to improve the soil’s fertility and drainage.

Choosing the Right Watermelon Variety for Arizona

Arizona’s unique climate and growing conditions require careful consideration when choosing the right watermelon variety to grow. Here are some factors to consider:

1. Heat Tolerance

Watermelons are heat-loving plants, but not all varieties can withstand the intense heat of Arizona. Look for varieties that are specifically bred for hot climates and have good heat tolerance. These varieties are adapted to thrive in high temperatures and will have a better chance of producing sweet and juicy watermelons.

2. Short Growing Season

Arizona has a relatively short growing season due to its hot summers and mild winters. When selecting a watermelon variety, choose one with a shorter maturity period to ensure that the fruit ripens before the weather becomes too hot or frost arrives in the fall. Look for early-maturing varieties that can produce ripe watermelons within 70-90 days.

3. Disease Resistance

Watermelon plants can be susceptible to various diseases, and Arizona’s warm and dry climate can create favorable conditions for some of these diseases. To minimize the risk of disease and ensure a successful harvest, choose watermelon varieties that have resistance to common diseases such as powdery mildew, fusarium wilt, or anthracnose. Disease-resistant varieties are more likely to thrive and produce healthy fruits.

4. Size and Shape

Consider the size and shape of the watermelon that you prefer. Some varieties produce large, oval-shaped watermelons, while others may produce small, round or oblong fruits. Choose a variety that suits your preferences and fits well in the available gardening space.

5. Taste and Texture

Watermelons come in various flavors and textures. Some are extra sweet, while others have a more subtle taste. Some varieties have crisp, firm flesh, while others have a more tender texture. Consider your personal preferences when it comes to taste and texture and choose a watermelon variety that suits your palate.

By considering these factors, you can choose the right watermelon variety that is well-suited for Arizona’s unique climate and growing conditions. This will increase your chances of a successful harvest and ensure that you can enjoy delicious, homegrown watermelons throughout the summer.

Preparing the Soil

Before planting watermelon seeds in Arizona, it is essential to prepare the soil properly. This step is crucial for the successful growth of watermelon plants. Here are some important tips to follow when preparing the soil:

1. Choose the Right Location

Watermelon plants need full sun to thrive, so choose a location with at least 6 to 8 hours of direct sunlight per day. Additionally, make sure the area has good drainage to prevent waterlogged soil, which can lead to root rot.

2. Clear the Area

Remove any weeds, rocks, or debris from the planting area. Weeds can compete with watermelon plants for nutrients and water, while rocks and debris can hinder root development.

3. Test the Soil

Perform a soil test to determine its pH level and nutrient content. Watermelon plants prefer slightly acidic soil with a pH range of 6.0 to 6.8. Adjust the pH if necessary by adding amendments like sulfur to lower the pH or lime to raise it. Additionally, based on the soil test results, add organic matter or nutrients like nitrogen, phosphorus, and potassium to improve soil fertility.

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4. Till the Soil

Use a garden tiller or a hand tool to till the soil to a depth of 8 to 10 inches. This will loosen compacted soil and create a good environment for watermelon plants’ root development.

5. Amend the Soil

Based on the soil test results, amend the soil with organic matter or compost. This will improve the soil’s structure and fertility, allowing better water retention and nutrient availability to the plants.

6. Create Raised Beds

In areas with heavy clay soil or poor drainage, it is advisable to create raised beds. Raised beds provide better drainage and prevent waterlogged soil, which can cause root damage or disease.

By following these steps, you can ensure that the soil is well-prepared for planting watermelon seeds in Arizona. The proper soil preparation will provide a solid foundation for healthy plant growth and increase the chances of a successful watermelon harvest.

Planting Watermelon Seeds

When it comes to planting watermelon seeds in Arizona, there are a few important steps to follow in order to ensure successful growth. Here is a detailed guide on how to properly plant watermelon seeds in Arizona:

  1. Choose the right time: Watermelon seeds should be planted after the danger of frost has passed and the soil temperature has reached at least 70 degrees Fahrenheit. In Arizona, this typically occurs in late spring or early summer.
  2. Select the planting site: Choose a location in your garden that receives full sun and has well-drained soil. Watermelons thrive in sandy soil, so if your soil is heavy clay, consider amending it with compost or sand to improve drainage.
  3. Prepare the soil: Before planting, prepare the soil by removing any weeds or grass. Dig the soil to a depth of about 6-8 inches and mix in some well-rotted compost or organic matter to enrich the soil and improve its fertility.
  4. Sow the seeds: Create small mounds or hills in the prepared soil, spacing them about 5-6 feet apart. Make sure each mound is at least 18-24 inches wide and 6-8 inches high. Plant 3-4 watermelon seeds in each mound, spacing them about 1 inch apart. Cover the seeds with about 1 inch of soil.
  5. Provide support: If you are growing larger watermelon varieties or if you expect your watermelons to grow to a large size, consider providing support such as trellises or stakes. This will help keep the vines off the ground and prevent the fruit from rotting.
  6. Thin out the seedlings: Once the seedlings have emerged and are about 2 inches tall, thin them out so that only the strongest seedling remains in each mound. This will ensure that the remaining plant has enough space and resources to grow properly.
  7. Protect from pests: Watermelon plants are vulnerable to pests such as aphids, cucumber beetles, and squash bugs. To protect your plants, consider using row covers or organic pest control methods.

By following these steps, you can ensure that your watermelon seeds have the best chance of germinating and growing into healthy plants that will produce delicious fruit.

Watering and Irrigation

Proper watering is crucial for growing watermelons in Arizona due to the hot and arid climate. Inadequate watering can lead to stunted growth, poor fruit development, and even plant death. Here are some tips to ensure your watermelon plants receive the right amount of water:

1. Watering Method

It is best to water watermelon plants early in the morning or in the late afternoon. Avoid watering during the hottest part of the day to prevent excessive evaporation.

2. Drip Irrigation

Using a drip irrigation system is highly recommended for watering watermelon plants in Arizona. This method allows water to be delivered directly to the roots, reducing water waste and minimizing weed growth. It also helps prevent foliar diseases, as water does not splash onto the leaves.

3. Watering Frequency

Watermelon plants require consistent moisture, especially during the hot summer months. Ensure that the soil is evenly moist but not waterlogged. Aim to water the plants deeply, reaching a depth of 6-8 inches, about once or twice a week. Adjust the frequency depending on weather conditions and the moisture level of the soil.

4. Mulching

Apply a layer of organic mulch, such as straw or wood chips, around the base of the watermelon plants. Mulching helps retain moisture in the soil, minimizes weed growth, and regulates soil temperature. It also prevents soil erosion and enhances the overall health of the plants.

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5. Avoid Overwatering

While it is important to provide sufficient water to the watermelon plants, overwatering can be harmful. Excessive moisture can lead to root rot and other fungal diseases. Monitor the moisture level of the soil and adjust the watering accordingly to avoid waterlogged conditions.

By following these watering and irrigation practices, you can help ensure the success of your watermelon crop in the Arizona climate.

Fertilizing and Mulching

Proper fertilizing and mulching techniques are crucial for growing healthy watermelon plants in the hot Arizona climate. Here are some tips to help you ensure your watermelon plants get the nutrients they need and are protected from the intense heat:

Choosing the Right Fertilizer

Watermelon plants have specific nutrient requirements, and applying fertilizer is essential to meet those needs. Use a balanced fertilizer with equal amounts of nitrogen (N), phosphorus (P), and potassium (K). Look for a fertilizer with an NPK ratio of around 10-10-10 or 12-12-12. These balanced formulas will provide the necessary nutrients without causing excessive growth or burning the plants.

Applying Fertilizer

Before planting your watermelon seeds, prepare the soil by adding a layer of compost or well-rotted manure. This will help improve the soil’s fertility and water-holding capacity. Once the plants have grown to about 2-3 inches tall, apply the fertilizer. Sprinkle the granules around the base of each plant, avoiding direct contact with the stems. Water the plants thoroughly after applying the fertilizer to ensure it reaches the roots.


Mulching is highly beneficial for watermelon plants in Arizona as it helps conserve moisture, regulate soil temperature, and suppress weed growth. Apply a layer of organic mulch, such as straw, wood chips, or grass clippings, around the base of the plants. Make sure to leave a small space around the stems to prevent rot. The mulch will act as a barrier, reducing evaporation and keeping the soil cool.

In addition to conserving moisture, mulch also helps prevent weeds from sprouting and competing for nutrients with the watermelon plants. This allows the plants to focus their energy on growth and fruit production.

To further enhance the benefits of mulching, you can also use plastic mulch. Lay black or red plastic sheets over the soil before planting the watermelon seeds. This method is especially effective for heat-loving watermelon varieties as the plastic warms the soil, promoting faster growth and earlier fruiting.

By following proper fertilizing and mulching practices, you can improve the overall health and productivity of your watermelon plants in Arizona’s challenging climate.

Protecting Watermelon Plants from Arizona Heat

Watermelon plants are susceptible to the extreme heat of Arizona, so it is important to take steps to protect them and ensure a healthy harvest. Here are some tips for protecting your watermelon plants from the intense Arizona heat:

1. Provide Shade: Creating shade for your watermelon plants can help protect them from the scorching sun. You can use shade cloth, umbrellas, or even erect a temporary shade structure to shield the plants from direct sunlight during the hottest parts of the day.

2. Mulch: Applying a layer of mulch around the watermelon plants helps to retain moisture in the soil, prevent weed growth, and regulate soil temperature. Organic mulch, such as straw or wood chips, works best for watermelon plants in Arizona.

3. Watering Schedule: Establish a regular watering schedule for your watermelon plants. It is best to water deeply and infrequently to encourage deep root growth. Watering in the early morning or evening when temperatures are cooler can also help minimize water evaporation.

4. Drip Irrigation: Consider using drip irrigation for your watermelon plants. This method delivers water directly to the plants’ roots, reducing water waste and minimizing evaporation. Drip irrigation can also help keep the leaves and fruit dry, reducing the risk of fungal diseases.

5. Provide Air Circulation: Ensuring proper air circulation around your watermelon plants can help prevent the formation of fungal diseases. Avoid overcrowding plants and provide adequate spacing between them. Pruning excess foliage can also help improve air circulation.

6. Monitor Soil Moisture: Regularly check the soil moisture level around your watermelon plants. Avoid overwatering, as this can lead to root rot, but also ensure that the soil does not dry out completely. Maintaining appropriate soil moisture is crucial for the health and growth of watermelon plants in Arizona.

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7. Monitor Temperature: Keep an eye on the temperature in your watermelon patch. If temperatures are consistently high, consider using shade cloth or other cooling techniques. If temperatures become extreme, consider providing temporary relief by misting the plants with water to help lower the ambient temperature.

8. Use Organic Pest Control: Arizona is home to various pests that can damage watermelon plants. Instead of using pesticides, opt for organic pest control methods like hand-picking pests, using insecticidal soaps, or introducing beneficial insects to your garden.

9. Harvest Early: To avoid potential damage from excessive heat, consider harvesting your watermelons a bit earlier than usual. This can help ensure that the fruit reaches maturity and is ready for harvest before the peak temperatures of the summer months.

By following these tips, you can protect your watermelon plants from the intense Arizona heat and increase your chances of a successful harvest.

Harvesting and Storing Watermelon

Harvesting watermelon at the right time is crucial to ensure that you are enjoying the sweetest and juiciest fruit. Here are some tips on how to harvest and store watermelon in Arizona.

Knowing When to Harvest

Watermelons are ready to be harvested when they reach full maturity. The signs of maturity include a dull skin color, the bottom of the fruit turning yellow, and the tendril near the stem drying up. Additionally, if you tap the fruit and it produces a deep hollow sound, it’s a good indication that it is ready to be picked.

How to Harvest

To harvest watermelons, use a sharp knife or pruning shears to cut the fruit from the vine. Leave a few inches of the stem attached to the fruit to help with storing and prevent rotting. Be careful not to damage the fruit while cutting.

It’s best to harvest watermelons in the morning when the temperatures are cooler, as the fruit will be less likely to soften and become damaged during transport.

Storing Watermelon

After harvesting, it’s essential to store watermelons properly to maintain their quality and taste. Here’s how:

Step Instructions
Step 1 Wash the harvested watermelons gently with clean water to remove dirt and debris. Let them air dry.
Step 2 Choose a cool and dry location for storing watermelons. The ideal temperature is around 50-60°F (10-15°C).
Step 3 Place the watermelons on a clean and dry surface, such as a wooden pallet or straw. Keeping them off the ground helps prevent moisture buildup and rot.
Step 4 Do not stack the watermelons on top of each other as it can cause bruising and damage. Keep them in a single layer.
Step 5 Regularly check the stored watermelons for any signs of rot or spoilage. Remove any damaged fruits to prevent the spread of decay.

When stored properly, watermelons can last for up to 2-3 weeks. However, keep in mind that the flavor and texture may deteriorate over time, so it’s best to consume them as soon as possible for the best taste.

Now that you know how to harvest and store watermelon in Arizona, you can enjoy the fruits of your labor throughout the season.

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