How To Plant Watermelon Plant [ Full Guide ]

Watermelon is a delicious and refreshing fruit that thrives in warm environments. Growing your own watermelon plants can be a rewarding experience, but it requires careful planning, proper location, soil preparation, variety selection, and planting methods. This comprehensive guide will walk you through the detailed steps of planting watermelon plants, from choosing the right location to starting seeds and nurturing the plants to maturity.

Quick Answer: How To Plant Watermelon Plant

To quickly summarize the process of planting watermelon plants, follow these main steps:

  1. Choosing the Right Location: Select a sunny spot with well-draining soil.
  2. Preparing the Soil: Ensure the soil is rich in organic matter and has a slightly acidic pH.
  3. Selecting the Right Watermelon Varieties: Choose varieties suited to your climate and space.
  4. Starting Seeds Indoors vs. Direct Sowing: Decide whether to start seeds indoors or directly sow in the ground.

By paying attention to each of these steps, you can maximize the chances of success in growing flavorful and juicy watermelons in your own garden.

Choosing The Right Location

Before planting watermelon plants, it’s crucial to select the right location. Watermelons require plenty of sunlight and warm temperatures to thrive. Choose a spot that receives at least 6-8 hours of direct sunlight per day. Additionally, the location should have well-draining soil to prevent water from pooling around the plants.

If you live in a region with a short growing season, consider planting watermelon in a location that is sheltered from cool winds to give the plants a head start. Remember that watermelon vines can spread significantly, so ensure that the chosen spot has ample space for the trailing vines to grow without overcrowding other plants.

Preparing The Soil

Watermelons thrive in fertile, well-drained soil with a slightly acidic pH level between 6.0 and 6.8. Start by testing the soil in the chosen location to determine its pH level. This can be done using a simple at-home soil test kit or by sending a sample to a local agricultural extension office for analysis.

If the soil pH is too high, it can be lowered by incorporating elemental sulfur into the soil. Conversely, if the pH is too low, the soil can be amended with lime to raise the pH level. Work these amendments into the soil well in advance of planting to allow time for them to take effect.

In addition to adjusting the pH, enrich the soil with organic matter such as compost or well-rotted manure. This will provide essential nutrients to the watermelon plants and improve the soil structure. Mix the organic matter thoroughly into the soil to ensure even distribution.

Selecting The Right Watermelon Varieties

Watermelons come in a variety of types, each with its own unique characteristics such as size, flavor, and maturation period. When selecting watermelon varieties to plant, consider the following factors:

  • Climate Suitability: Choose varieties that are well-suited to the climate in your region. Some watermelon varieties are better adapted to cooler climates, while others thrive in hot and humid conditions.
  • Space Availability: Consider the space available in your garden. Some watermelon varieties produce compact vines and smaller fruits, making them suitable for small gardens or containers.
  • Flavor and Texture: Different watermelon varieties offer varying levels of sweetness, texture, and color. Research the flavor profiles of different varieties to choose the ones that appeal to your taste preferences.

Popular watermelon varieties include ‘Sugar Baby’ for its small size and early maturation, ‘Black Diamond’ for its large and sweet fruits, and ‘Crimson Sweet’ for its juicy and flavorful flesh. Check with local nurseries or agricultural extension offices for recommendations on which varieties are best suited for your specific growing conditions.

Starting Seeds Indoors Vs. Direct Sowing

When it comes to planting watermelon seeds, you have the option of starting seeds indoors or directly sowing them into the ground. Each method has its own advantages and considerations.

Starting Seeds Indoors

Starting watermelon seeds indoors allows for an earlier start to the growing season, particularly in regions with short summers. It also provides more control over the germination process and early seedling growth.

To start watermelon seeds indoors, follow these steps:

  1. Use biodegradable pots or seedling trays filled with a high-quality seed starting mix.
  2. Plant 2-3 seeds per pot or cell, at a depth of 1 inch.
  3. Keep the soil consistently moist and maintain a temperature between 75-85°F (24-29°C) for optimal germination.
  4. Once the seedlings develop their first set of true leaves, thin them to one strongest seedling per pot or cell.

Transplant the seedlings outdoors after the last frost date for your region, once the soil has warmed and all chance of frost has passed.

Direct Sowing

Direct sowing watermelon seeds is a straightforward method that is well-suited for regions with longer growing seasons and warm soil. It eliminates the need for transplanting seedlings and allows the plants to establish themselves directly in their final growing location.

To directly sow watermelon seeds, follow these steps:

  1. Wait until the soil temperature reaches at least 70°F (21°C). Use a soil thermometer to monitor the temperature, typically measured at a depth of 4 inches.
  2. Plant the seeds in mounds or rows, at a depth of 1 inch and a spacing of 2-3 feet apart, with 6-8 feet spacing between rows for ample spreading room.
  3. Keep the soil consistently moist, especially during the germination and early growth stages.

Whichever method you choose, ensure that the soil remains consistently moist but not waterlogged during the germination and early growth stages to promote healthy seedling development.

Successfully planting watermelon plants begins with careful consideration of the location, soil preparation, variety selection, and planting method. By choosing a sunny and spacious spot, preparing fertile and well-drained soil, selecting suitable watermelon varieties, and following the appropriate planting method, you can set the stage for healthy watermelon plants and a bountiful harvest.

Remember to monitor the plants regularly, provide adequate water and nutrients, and protect them from pests and diseases as they grow. With proper care and attention, your watermelon plants will reward you with fresh, juicy fruits that are perfect for enjoying on a hot summer day.

Planting Watermelon Seeds

Watermelon is a popular summertime fruit known for its sweet and juicy flesh. Not only is it delicious to eat, but it can also be a rewarding and fun experience to grow your own watermelon plants. Planting watermelon seeds and tending to the plants requires proper techniques and care to ensure healthy growth and a bountiful harvest.

  1. Selecting the Right Variety: Before planting watermelon seeds, it is essential to choose the right variety that suits your growing conditions and preferences. There are many different types of watermelons available, each with its own distinctive characteristics, such as size, flavor, and rind color. Some popular varieties include “Sugar Baby”, “Crimson Sweet”, and “Charleston Gray”. Consider factors like soil type, climate, and available space when selecting the variety.

  2. Prepping the Soil: Watermelons thrive in well-draining soil with a pH level between 6 and 6.8. Start by clearing the area of any weeds, rocks, or debris. Loosen the soil to a depth of at least 12 inches using a garden fork or tiller. Incorporate organic matter like compost or aged manure to improve soil fertility and drainage.

  3. Germinating Watermelon Seeds: Watermelon seeds can be germinated indoors or directly sown in the garden. Germinating seeds indoors allows for better control over the growth environment, particularly in regions with short growing seasons. Start by filling biodegradable seedling pots or trays with seed starting mix. Plant two to three seeds per pot, about half an inch deep. Keep the soil consistently moist and maintain a temperature between 75 and 85°F (24-29°C) for successful germination. Once seedlings develop their second set of leaves, thin them out, keeping only the strongest plant.

  4. Direct Sowing: If you live in a region with a long growing season and warm soil, you can directly sow watermelon seeds in the garden. Wait until the danger of frost has passed and the soil temperature has reached at least 70°F (21°C). Create small mounds or hills that are around 3 feet apart to provide the plants with adequate drainage. Plant three to four seeds per hill, about an inch deep. After germination, thin the seedlings, retaining the healthiest plant in each hill.

  5. Transplanting Seedlings: If you started your watermelon seeds indoors, transplant the seedlings into the garden once they have developed their true leaves and all chances of frost have passed. Choose a warm and sunny spot in the garden with enough space for the vines to spread. Dig holes slightly larger than the seedling’s root ball and gently place the seedling, covering the roots with soil. Space the plants about 2-3 feet apart, leaving ample room for the vines to grow.

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Watering Techniques

Proper watering is crucial for the healthy growth of watermelon plants, as they require an adequate supply of moisture throughout the growing season. Here are some important watering techniques to keep in mind:

  1. Establishing a Watering Schedule: Watermelons have high water requirements, especially during hot and dry periods. It is essential to establish a regular watering schedule to ensure that plants receive consistent moisture. Water deeply, aiming for around 1-2 inches of water per week. To determine the right amount of water, use a rain gauge or a shallow dish placed near the base of the plant to measure rainfall.

  2. Watering at the Base: When watering watermelon plants, it is best to focus on the base of the plant and avoid wetting the foliage. By watering at the base, you reduce the risk of fungal diseases and water evaporation. Consider using a soaker hose or drip irrigation system to maintain soil moisture without wetting the leaves and fruits.

  3. Mulching: Mulching is a beneficial practice for watermelon plants as it helps retain soil moisture, suppresses weed growth, and regulates soil temperature. Apply a layer of organic mulch, such as straw or wood chips, around the base of the plants, leaving a few inches of space around the stem. This will prevent water evaporation and keep the soil consistently moist.

  4. Monitoring Soil Moisture: Regularly monitor the soil moisture levels to ensure that it remains consistently moist. Stick your finger about an inch into the soil to check for dryness. If the soil feels dry, it’s time to water. Additionally, avoid overwatering, as waterlogged soil can lead to root rot and other problems. Strive for a balance between moisture retention and proper drainage.

Fertilizing Watermelon Plants

Watermelon plants have particular nutrient requirements to support their vigorous growth and fruit production. Fertilizing at the right time and with the appropriate nutrients is essential for healthy watermelon plants. Here’s what you need to know:

  1. Soil Testing: Before planting your watermelon seeds or transplanting seedlings, it is advisable to conduct a soil test. A soil test will help determine the nutrient content and pH level of the soil, allowing you to make informed decisions about the type and amount of fertilizers needed. Contact your local agricultural extension office or use a home testing kit to obtain accurate results.

  2. Pre-Planting Fertilization: Watermelon plants benefit from a nutrient-rich soil right from the start. A week or two before planting, incorporate a balanced, organic fertilizer into the soil. Look for fertilizers with an NPK ratio of around 10-10-10 or 14-14-14. Follow the package instructions for the recommended application rate.

  3. Side-Dressing: Once the watermelon plants have started actively growing, they will require additional fertilization to support their nutrient needs. Side-dressing is a technique where you apply fertilizer in a band around the plants, away from the base of the stem. Use a balanced fertilizer or a fertilizer specifically formulated for fruiting plants, following the recommended dosage on the package label. Apply the fertilizer about 6 inches away from the plants to prevent burning the roots and water it in thoroughly.

  4. Organic Alternatives: If you prefer organic cultivation methods, there are natural alternatives you can use to fertilize watermelon plants. Compost and well-rotted manure are excellent options for enriching the soil with organic matter and nutrients. Apply a layer of compost or composted manure around the base of the plants, ensuring it remains a few inches away from the stem. This will provide a slow-release source of nutrients throughout the growing season.

Trellising Or Supporting Watermelon Vines

As watermelon plants grow, they develop long, sprawling vines that can quickly take up a significant amount of garden space. Trellising or supporting the vines helps save space, improve air circulation, and protect the fruits from rotting on the ground. Here’s how to do it:

  1. Choose a Trellising Method: There are several trellising methods suitable for watermelon plants, depending on your available space and preferences. One common method is to use a sturdy, vertically positioned trellis or trellising net. Alternatively, you can provide support by using slings or hammocks to hold the fruit as it develops, tying the vines to stakes or installing a trellis with horizontal supports.

  2. Training the Vines: As the watermelon plants grow, gently guide the vines towards the trellis or support structure. Use soft plant ties or strips of cloth to secure the vines loosely, allowing room for growth. Avoid tying the vines too tightly to prevent girdling and damage.

  3. Supporting the Fruits: As the watermelon fruits start to develop, they can become heavy and put strain on the vines. Use slings made of old pantyhose or fabric strips to support the fruit and prevent them from breaking off the vine. Attach one end of the sling to the trellis or support structure and gently secure the other end around the developing fruit.

  4. Regular Maintenance: Regularly check and adjust the trellising or support system as the watermelon plants grow. Prune any excess and crowded vines to maintain proper airflow and prevent diseases. Monitor the weight of the developing fruits and adjust the slings or support as needed to prevent damage.

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Protecting Plants From Pests And Diseases

Watermelon plants are susceptible to a variety of pests and diseases that can affect their growth and yield. Implementing preventive measures and practicing good garden hygiene can help protect your watermelon plants. Here are some tips:

  1. Crop Rotation: Avoid planting watermelon plants in the same location year after year. Practice crop rotation, as this helps reduce the risk of soilborne diseases and pests. Rotate watermelons with plants from different families, such as corn or beans, to break the life cycle of potential pests and pathogens.

  2. Companion Planting: Planting companion plants around watermelon can help repel pests and attract beneficial insects. Marigolds, for example, are known to repel nematodes and certain insect pests. Nasturtiums can deter aphids and squash bugs. Be sure to research the compatibility of plants before establishing companion plantings.

  3. Regular Inspections: Regularly inspect the watermelon plants for signs of pests or diseases. Look for common watermelon pests such as aphids, cucumber beetles, and squash bugs. Check the undersides of leaves, stems, and fruits for eggs, larvae, or adult insects. Early detection is key to preventing pest infestations from spreading.

  4. Biological Controls: Consider using biological controls, such as beneficial insects and nematodes, to manage pest populations naturally. Ladybugs, lacewings, and parasitic wasps feed on common watermelon pests and can be introduced into the garden. Nematodes can also be applied to control soilborne pests, following the instructions provided.

  5. Integrated Pest Management (IPM): Employ an Integrated Pest Management approach, which combines various pest control methods to minimize the use of chemical pesticides. This includes practices like proper sanitation, regular monitoring, physical barriers, and cultural techniques to reduce pest and disease pressure.

  6. Fungal Diseases: Watermelon plants are susceptible to fungal diseases like powdery mildew and downy mildew. To prevent these diseases, avoid overhead watering, as moisture on the leaves promotes their development. If necessary, apply appropriate fungicides according to the product instructions and timing of application.

Growing watermelon plants can be a rewarding and enjoyable experience, whether you have a large garden or limited space. By following the proper techniques for planting, watering, fertilizing, and supporting the vines, you can ensure healthy growth and a bountiful harvest of sweet watermelons. Additionally, implementing measures to protect the plants from pests and diseases will help maintain the plants’ vigor and productivity. With the right care and attention, you can enjoy the satisfaction of growing your own juicy, homegrown watermelons.

Harvesting Watermelons

Watermelons are a delicious and refreshing fruit that many people enjoy during the hot summer months. If you have a green thumb and want to try your hand at growing your own watermelons, you are in for a treat! However, successfully growing watermelons requires some knowledge and effort.

Watermelons are typically ready to be harvested 80-90 days after planting the seeds. However, the exact timing can vary depending on the variety of watermelon you are growing. Here are some signs that indicate when it’s time to harvest your watermelons:

  1. Thumping: You can gently tap on the watermelon with your knuckles. If it produces a dull, hollow sound, it is likely ripe. If the sound is too high-pitched, the watermelon may not be fully matured.

  2. Color: The color of the watermelon’s skin can be a good indicator of ripeness. Most watermelons have a deep green skin when they are immature. As they ripen, the skin color will change to a lighter shade of green or even yellow. Look for a uniform color and avoid fruits with white or green spots.

  3. Tendril drying: Watermelon plants produce thin tendrils near the stem of the fruit. When the watermelon is ripe, these tendrils will start to dry out and turn brown. If most of the tendrils are dry, it’s a good indication that the watermelon is ready to be harvested.

  4. Size and weight: Ripe watermelons are usually heavier than unripe ones. Gently lift the watermelon and feel its weight. If it feels heavy for its size, it’s a good sign that it’s ready to be harvested.

When harvesting watermelons, it’s important not to rush the process. Leaving the watermelon on the vine for a few extra days can enhance its sweetness and texture. Use a clean, sharp knife or shears to cut the stem of the watermelon. Leave a few inches of stem attached to the fruit to prevent it from rotting.

Storing And Preserving Watermelons

After harvesting your watermelons, you may wonder how to store and preserve them to enjoy their flavorful goodness for a longer period. Here are some tips to ensure that your watermelons stay fresh:

  1. Cool and dry storage: Watermelons should be stored in a cool, dry place to prevent them from rotting. The ideal temperature for storing watermelons is around 50-60°F (10-15°C). Avoid humid areas as they can accelerate spoilage.

  2. Avoid stacking: Watermelons are delicate fruits and can easily get bruised or damaged if stacked on top of each other. Store them individually or on a soft surface to protect them from any impact.

  3. Don’t wash before storing: Watermelons have a natural protective coating on their skin, which helps to preserve freshness. Washing the watermelons before storage can remove this protective layer and make them spoil faster. Only wash the watermelon just before consuming it.

  4. Keep away from ethylene-producing fruits: Ethylene is a gas that promotes ripening. Keep watermelons away from fruits like apples, bananas, and tomatoes, as they release ethylene and can accelerate the ripening process of watermelons.

  5. Refrigeration: If you want to extend the shelf life of your watermelon, you can store it in the refrigerator. However, note that refrigeration can affect the texture and flavor of the watermelon. It is best to consume refrigerated watermelons within a week.

Tips For Achieving Sweet And Juicy Watermelons

Growing sweet and juicy watermelons is a result of several factors, including choosing the right variety, proper planting techniques, and providing optimal growing conditions. Here are some tips to help you achieve the best watermelon harvest:

  1. Select the right variety: There are numerous watermelon varieties available, each with its own taste, texture, and size. If you prefer sweeter watermelons, look for varieties labeled as "sugar baby," "sugar belle," or "candy," as these tend to have a higher sugar content.

  2. Plant in the right location: Watermelons thrive in full sun, so choose a location in your garden that receives at least 6-8 hours of direct sunlight each day. Ensure that the area has well-draining soil, as waterlogged conditions can lead to fungal diseases and poor fruit development.

  3. Prepare the soil: Watermelons prefer soil that is rich in organic matter, loose, and well-draining. Before planting, amend the soil with compost or aged manure to improve its nutrient content and drainage. Aim for a soil pH level between 6.0 and 7.0, as watermelons prefer slightly acidic to neutral soil.

  4. Planting technique: Watermelons are typically started from seeds rather than seedlings. Plant the watermelon seeds in hills or mounds, as this helps with drainage and warming the soil. Create small hills that are 12-18 inches in diameter and 4-6 inches tall. Plant 4-5 watermelon seeds in each hill and thin out the weakest seedlings once they have germinated.

  5. Proper spacing: Watermelon plants need ample space to grow and spread their vines. Allow a minimum of 3-4 feet between each watermelon plant. This spacing ensures enough air circulation and sunlight penetration, reducing the chances of disease and promoting healthy growth.

  6. Watering and fertilizing: Watermelons require consistent watering throughout their growing season. Keep the soil evenly moist, but not overly saturated, as waterlogged conditions can lead to root rot. Use a soaker hose or drip irrigation system to provide deep, consistent waterings. Apply a balanced fertilizer once the plants start to develop true leaves and feed them again every few weeks during the growing season.

  7. Mulching: Apply a layer of organic mulch, such as straw or wood chips, around the watermelon plants. Mulching helps to conserve moisture, suppress weeds, and regulate soil temperature. It also prevents the watermelon fruits from sitting on damp soil, which can cause them to rot.

  8. Pollination: Watermelon plants rely on bees and other pollinators for successful pollination and fruit development. Encourage pollinators to visit your garden by planting flowers that attract them nearby. Avoid using pesticides that can harm these beneficial insects.

  9. Support for growing vines: As the watermelon plants grow, their vines can become heavy with fruit. Supporting the vines can prevent them from breaking and reduce the risk of disease. Use trellises, cages, or stakes to support the vines and lift them off the ground.

  10. Thinning the fruits: Watermelon plants often produce more fruits than they can support. To ensure the remaining watermelons grow to a good size, thin out the fruits. Leave only one or two watermelons per vine, removing the smaller or misshapen ones.

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Troubleshooting Common Watermelon Growing Problems

Despite your best efforts, you may encounter some problems while growing watermelons. Here are a few common issues and their solutions:

  1. Poor fruit set: If your watermelon plants have healthy foliage but are not producing fruits, the problem may lie with pollination. Ensure that there is an adequate population of pollinators in your garden. You can also hand-pollinate the flowers by transferring pollen from the male flowers to the female flowers using a small brush or cotton swab.

  2. Blossom end rot: Blossom end rot is a condition where the end of the watermelon opposite the stem becomes black and sunken. It is caused by a calcium deficiency in the plant or irregular watering. Ensure that the soil is evenly moist and apply a calcium-rich fertilizer according to the package instructions.

  3. Pest infestation: Common pests that can attack watermelon plants include aphids, cucumber beetles, and squash bugs. Monitor your plants regularly and take action at the first sign of an infestation. You can remove pests by hand, use organic insecticidal soap or neem oil, or introduce beneficial insects like ladybugs and lacewings.

  4. Fungal diseases: Watermelon plants are susceptible to fungal diseases like powdery mildew and downy mildew. Ensure good air circulation around the plant by proper spacing and trellising the vines. If disease occurs, promptly remove and destroy the affected leaves. Fungicidal sprays may be necessary in severe cases.

  5. Sunburn: Watermelon fruits can get sunburned if left exposed to direct sunlight for extended periods, especially if the leaves do not provide enough shade. Protect the fruits by placing a light-colored cloth or cardboard sheet under them, providing partial shade.


Growing your own watermelon plants can be a rewarding experience that allows you to enjoy the freshest and most flavorful fruits right from your garden. By following the steps outlined in this article, you can successfully plant watermelon plants, harvest the fruits at the right time, store and preserve them properly, and troubleshoot any issues that may arise along the way. Remember to choose the right variety, provide optimal growing conditions, and pay attention to watering, pollination, and pest control. With patience and care, you will be rewarded with sweet and juicy watermelons that are a delight to savor.


What Type Of Soil Is Best For Planting Watermelon?

Well-drained, sandy loam soil with a pH level between 6.0 and 6.8 is ideal for watermelon plants. This type of soil will allow for proper drainage while also providing necessary nutrients for growth.

When Should Watermelon Plants Be Planted?

Watermelon plants should be planted after the last frost and when soil temperatures reach at least 70 degrees Fahrenheit. This is typically in late spring or early summer in most regions.

How Much Space Is Needed Between Watermelon Plants?

Watermelon plants require ample space to grow and spread. Plant seeds or seedlings at least 8-10 feet apart in rows, with 10-12 feet between each row. Vining varieties may require even more space.

How Often Should Watermelon Plants Be Watered?

Watermelon plants require consistent moisture to thrive, so they should be watered deeply at least once a week. Increase watering during hot and dry periods, and reduce watering as the fruit matures to prevent splitting.

How Can I Tell When Watermelon Is Ripe And Ready To Harvest?

Watermelon is typically ready to harvest 75-90 days after planting. Look for a yellow or cream-colored spot on the bottom of the fruit, known as the "ground spot." This spot should be fully developed and the skin should be dull, not shiny. Additionally, the fruit should sound hollow when tapped.