Growing Watermelon in Pennsylvania: Tips and Tricks for Success

By: Carolyn J. Vance

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Watermelon is a delicious and refreshing fruit that thrives in the warm summer months. While Pennsylvania may not be known for its tropical climate, it is still possible to grow watermelon successfully in this state. With careful planning and the right techniques, you can enjoy homegrown watermelons that are sweet, juicy, and bursting with flavor.

One of the first steps to successfully growing watermelon in Pennsylvania is selecting the right variety. Due to the short growing season in this region, it is best to choose early-maturing or short-season watermelon varieties. These types of watermelons require fewer days to mature and are more likely to ripen before the first frost hits.

When it comes to planting, watermelons prefer well-drained soil with plenty of organic matter. Start by preparing the soil by removing any weeds or debris. It is recommended to incorporate compost or well-rotted manure into the soil to improve its fertility and drainage. Watermelons also require a sunny spot in the garden with at least 6-8 hours of direct sunlight daily.

After preparing the soil, sow the watermelon seeds directly into the ground once the soil temperature reaches at least 70°F (21°C). Plant the seeds about 1 inch deep and space them 2-3 feet apart. Watermelons are heavy feeders, so it is essential to water them consistently throughout the growing season. Adequate water and fertilization are key to producing large, juicy watermelons.

By following these tips and techniques, you can successfully grow watermelons in Pennsylvania and enjoy the taste of homegrown fruit all summer long. Remember to monitor your plants for pests and diseases and take appropriate action if needed. With a little bit of effort and patience, you can have a bountiful harvest of delicious watermelons that will make your summer even sweeter.

Selecting the Right Varieties

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Growing watermelon in Pennsylvania requires selecting the right varieties that can thrive in the local climate and soil conditions. Here are some key considerations to keep in mind when choosing watermelon varieties for your Pennsylvania garden:

1. Climate and Growing Season

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

2. Disease Resistance

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Watermelons can be prone to various diseases, such as powdery mildew, fusarium wilt, and anthracnose. When selecting varieties, look for those that have resistance or tolerance to these common diseases. This will help ensure a healthier and more productive crop.

3. Size and Shape

Consider the size and shape of the watermelon you prefer. Some varieties produce large, round watermelons, while others may be smaller and oblong. Choose a variety that suits your personal preferences and the available space in your garden.

4. Seedless or Seeded

Watermelon varieties come in both seeded and seedless varieties. Seeded watermelons may have larger, edible seeds that some people enjoy, while seedless varieties are typically easier to eat. Consider whether you prefer the convenience of a seedless variety or don’t mind dealing with seeds when making your selection.

5. Flavor and Sweetness

6. Vining or Bush

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Watermelon plants can either be vining or bush types. Vining varieties require more space as they tend to spread out and vine along the ground. Bush varieties, on the other hand, are more compact and well-suited for smaller gardens or containers. Choose the type that best fits your garden space.

By considering these factors and selecting the right watermelon varieties, you can ensure a successful and enjoyable gardening experience in Pennsylvania.

Preparing the Soil

Before planting watermelons in Pennsylvania, it is important to properly prepare the soil. Follow these steps to ensure optimal growing conditions:

  1. Test the soil: Begin by testing the soil pH and nutrient levels. Watermelons thrive in a pH range of 6.0 to 6.8. If the pH is too low, add lime to raise it. If the pH is too high, add sulfur to lower it. Testing the nutrient levels will determine if any amendments, such as compost or fertilizer, are necessary.
  2. Clear the area: Remove any weeds, rocks, or debris from the planting area. This will prevent competition for nutrients and provide a clean space for the watermelon plants to grow.
  3. Till the soil: Use a garden tiller or a shovel to loosen the soil to a depth of at least 8-12 inches. This will improve drainage, as watermelons do not tolerate soggy soil, and will also make it easier for the roots to penetrate the soil.
  4. Add organic matter: Incorporate compost or well-rotted manure into the soil to improve its fertility and moisture-retaining capacity. This will provide the necessary nutrients for healthy plant growth.
  5. Apply fertilizer: Before planting, apply a balanced fertilizer according to the soil test recommendations. This will ensure that the watermelon plants have the necessary nutrients for vigorous growth. Follow the instructions on the fertilizer package for proper application rates.
  6. Smooth the soil: Use a rake to level the soil surface and create a smooth planting bed. This will facilitate even water distribution and make it easier to plant the watermelon seeds or transplants.
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By following these steps for preparing the soil, you will create an optimal growing environment for watermelons in Pennsylvania. This will increase your chances of a successful harvest and ensure that the watermelon plants have the necessary nutrients and conditions to thrive.

Planting and Fertilizing

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Proper planting and fertilizing techniques are crucial for the successful growth of watermelons in Pennsylvania. By following these guidelines, you can maximize the yield and quality of your watermelon crop.

1. Choose the Right Location: Watermelons require full sun exposure to thrive. Select a planting site that receives at least 6-8 hours of direct sunlight per day. Additionally, ensure that the soil has good drainage to prevent waterlogged conditions.

2. Prepare the Soil: Before planting, it is essential to prepare the soil properly. Start by removing any weeds or grass from the area. Then, work the soil to a depth of 12-18 inches using a garden fork or tiller. Break up any clumps and remove rocks or debris. Watermelons prefer slightly acidic soil with a pH level between 6.0 and 6.8. Test the soil and amend it with lime if necessary to adjust the pH.

3. Choose the Right Time to Plant: Watermelons are warm-season crops that require soil temperatures of at least 70°F for optimal growth. Wait until the soil has warmed up sufficiently before planting. In Pennsylvania, this is typically around mid to late May. Planting too early may result in stunted growth or the death of seedlings.

4. Plant the Seeds: Watermelons can be grown from seeds or transplants. If using seeds, plant them directly into the prepared soil. Create mounds or hills about 3-4 feet apart to promote good drainage. Plant 4-6 seeds per mound, about 1 inch deep. Once the seedlings have emerged, thin them to leave the strongest one or two plants per mound.

5. Fertilize Regularly: Watermelons are heavy feeders and require adequate nutrition to develop and produce fruit. Apply a balanced fertilizer, such as a 10-10-10 or 14-14-14, at planting time. Follow the package instructions for the correct application rate. As the plants grow, side-dress them with additional fertilizer every 3-4 weeks. This will provide the necessary nutrients for continuous growth and fruit development.

6. Provide Proper Support: As the watermelon vines grow, they may require support to prevent them from sprawling on the ground. Use stakes or trellises to keep the vines off the soil. This will improve air circulation, reduce the risk of disease, and make it easier to harvest the fruit.

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7. Watering: Watermelons need consistent moisture throughout the growing season. Provide 1-2 inches of water per week, either through rainfall or irrigation. Water deeply and avoid overhead watering, as wet foliage can promote diseases. Mulching around the plants with straw or mulch will help retain soil moisture and prevent weed growth.

8. Weed Control: Keep the area around the watermelon plants free from weeds. Weeds compete with the watermelon plants for nutrients and water, reducing their growth and productivity. Regularly remove weeds by hand or use a shallow hoe to prevent damage to the plant’s shallow roots.

By following these planting and fertilizing guidelines, you can ensure a successful watermelon harvest in Pennsylvania. With proper care and attention, you’ll be able to enjoy juicy and delicious watermelons all summer long!

Watering and Mulching

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Proper watering is crucial for the successful growth of watermelon plants in Pennsylvania. Watermelons require consistent and deep watering to ensure healthy fruit development. Here are some tips for watering your watermelon plants:

1. Watering Frequency

Watermelon plants need regular watering, especially during hot and dry weather. Aim to water your plants deeply at least once a week. However, if the weather is exceptionally hot, you may need to water more frequently to prevent the soil from drying out too quickly.

2. Watering Method

It is best to water watermelon plants at the base of the plant rather than from above. This helps minimize the risk of moisture-related diseases, such as powdery mildew. Use a soaker hose or drip irrigation system to deliver water directly to the root zone. Avoid wetting the foliage as much as possible.

3. Mulching

Growing Watermelon in Pennsylvania: Tips and Tricks for Success

Mulching your watermelon plants is essential for moisture retention and weed suppression. Apply a layer of organic mulch, such as straw or wood chips, around the base of the plants. This will help keep the soil moist, regulate soil temperature, and prevent weed growth.

When mulching, make sure to leave some space around the plant stem to prevent moisture-related diseases. The mulch layer should be around 2-3 inches deep. Refresh the mulch as needed throughout the growing season.

By following these watering and mulching practices, you can provide your watermelon plants with the necessary moisture for healthy growth and maximize your chances of a successful harvest.

Pest and Disease Control

When growing watermelons in Pennsylvania, it is important to be aware of the potential pests and diseases that can affect your crop. By taking preventive measures and implementing proper control methods, you can protect your plants and ensure a successful harvest.


  • Aphids: These small insects feed on the sap of the watermelon plants and can cause damage by sucking out the juices. Use insecticidal soap or neem oil to control aphids.
  • Whiteflies: These tiny white insects can transmit diseases to your watermelons. Use yellow sticky traps or apply sticky tape to control whiteflies.
  • Spider mites: These arachnids can cause damage by sucking out fluids from the leaves. Keep the foliage of your watermelon plants regularly sprayed with water to prevent spider mite infestations.
  • Cutworms: These caterpillar-like larvae feed on the stems of watermelon plants. Use collars around the plants to prevent cutworms from accessing the stems.
  • Squash bugs: These pests can cause significant damage to watermelon plants by sucking out sap and laying eggs. Use insecticidal soap or neem oil to control squash bugs.
  • Slugs and snails: These slimy creatures feed on the leaves and fruits of watermelon plants. Use beer traps or diatomaceous earth to control slugs and snails.


  • Anthracnose: This fungal disease can cause dark, sunken lesions on the leaves, stems, and fruits of watermelon plants. Keep the plants properly spaced to improve air circulation and use fungicides to control anthracnose.
  • Powdery mildew: This fungal disease appears as a white powdery coating on the leaves of watermelon plants. Use fungicides and avoid overhead watering to control powdery mildew.
  • Fusarium wilt: This soil-borne disease can cause wilting, yellowing, and stunted growth in watermelon plants. Choose resistant varieties and practice crop rotation to reduce the risk of fusarium wilt.
  • Verticillium wilt: This fungal disease affects the vascular system of watermelon plants, causing wilting and yellowing of leaves. Choose resistant varieties and practice crop rotation to control verticillium wilt.
  • Mosaic virus: This viral disease can cause mottling, yellowing, and distortion of leaves in watermelon plants. Use resistant varieties and control aphids to prevent the spread of mosaic virus.
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Regularly inspect your watermelon plants for signs of pests or diseases. By identifying and treating problems early on, you can minimize the damage and protect your crop. Remember to always follow the instructions on pesticide labels and use chemicals responsibly.

Harvesting the Fruit

Harvesting watermelons is an exciting time for any gardener, as it marks the culmination of months of hard work and anticipation. Here are some tips to ensure that you harvest your watermelons at the peak of ripeness and enjoy the sweetest fruits possible.


One sign that a watermelon is ripe and ready to harvest is the change in color of the skin. The skin should develop a dull appearance and the underside should have a yellowish or creamy color, indicating that it’s fully ripe. Additionally, the tendril closest to the fruit should turn brown and dry out.


Growing Watermelon in Pennsylvania: Tips and Tricks for Success

When the time comes to harvest your watermelons, it’s best to use a sharp knife or pruning shears to cut the stem about an inch above the fruit. Avoid pulling or twisting the fruits, as this can damage the vines and affect future growth. It’s also important to handle the watermelons with care to avoid bruising or cracking the skin.

After harvesting, it’s a good idea to wash the watermelons gently to remove any dirt or debris. Once cleaned, they can be stored at room temperature for a few days or refrigerated for up to two weeks, depending on their level of ripeness.

Enjoying the Fruits of Your Labor

Once your watermelons are harvested, it’s time to savor the fruits of your labor. There are numerous ways to enjoy watermelon, whether you prefer it sliced, cubed, juiced, or included in salads, smoothies, or desserts. The possibilities are endless!

Remember to save some seeds from your harvested watermelons for future planting. This will allow you to continue growing delicious watermelons year after year.

Now that you’re equipped with the knowledge of harvesting watermelons, get ready to enjoy the sweet, juicy rewards of your hard work in the garden. Happy harvesting!

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