Tips for Growing Watermelon in Wisconsin

Watermelon is a delicious and refreshing fruit that is perfect for enjoying during the hot summer months. While many people may think that growing watermelon in a northern state like Wisconsin is impossible, it can actually be done with the right techniques and care. If you’ve always dreamed of growing your own juicy watermelon in your Wisconsin backyard, then this article is for you.

Once you’ve chosen the right variety, it’s time to prepare your soil. Watermelons thrive in well-drained soil that is rich in organic matter. Make sure to clear any weeds or debris from your planting area and then amend the soil with compost or aged manure to improve its fertility. This will provide your watermelon plants with the nutrients they need to grow and produce juicy fruits.

As your watermelon plants grow, make sure to water them regularly, especially during dry periods. Watermelons are 92% water, so they require a consistent supply of moisture to thrive. It’s best to water them deeply and infrequently to encourage deep root growth. Mulching around the plants can help to retain moisture and suppress weeds.

By following these tips and techniques, you can successfully grow watermelon in Wisconsin and enjoy the sweet taste of homegrown fruit. From choosing the right variety to providing the necessary care and attention, you’ll be able to harvest your own juicy watermelons and impress your friends and family with your gardening skills.

Choosing the Right Variety of Watermelon

Cold-Hardy Varieties

One of the top considerations when choosing a watermelon variety for Wisconsin is its ability to tolerate colder temperatures. Look for varieties that are specifically bred for northern climates or have a reputation for being cold-hardy.

Some popular cold-hardy watermelon varieties include “Sugar Baby,” “Blacktail Mountain,” and “Mountain Sweet Yellow.” These varieties have been bred to withstand cooler temperatures and can perform well in Wisconsin’s climate.

Early Maturing Varieties

Another important factor in choosing a watermelon variety for Wisconsin is its maturity date. Since the growing season in Wisconsin is relatively short, selecting early maturing varieties is essential to ensure a successful harvest.

Consider varieties that typically reach maturity within 70-85 days, as they are more likely to produce ripe fruit before the first frost. Some early maturing watermelon varieties that are well-suited for Wisconsin include “Early Moonbeam,” “New Queen,” and “Millionaire.”

It’s also worth noting that smaller varieties, such as “Sugar Baby,” tend to mature earlier than larger varieties. This can be advantageous in Wisconsin’s climate where the growing season is limited.

By selecting cold-hardy and early maturing watermelon varieties, you can increase your chances of successfully growing watermelons in Wisconsin. Remember to consider your preferences and growing conditions before making your final decision.

Preparing the Soil

Properly preparing the soil is a crucial step in successfully growing watermelons in Wisconsin. Here are some important guidelines to follow:

1. Test the Soil

Before planting watermelon seeds, it is essential to test the soil to determine its pH level. Watermelons prefer a pH range of 6.0 to 6.8. If the soil is too acidic, you can add lime to raise the pH level. On the other hand, if the soil is too alkaline, you can add sulfur to lower the pH level. Testing the soil will ensure that it has the optimal conditions for watermelon growth.

2. Remove Weeds and Debris

Prior to planting, it is important to remove any weeds or debris from the area where the watermelons will be grown. Weeds can compete for nutrients and water, hindering the growth of watermelon plants. Remove any rocks, sticks, or other debris that may interfere with the development of the watermelon roots.

3. Add Organic Matter

Watermelons thrive in nutrient-rich soil, so it is beneficial to add organic matter such as compost or well-rotted manure. This will improve the soil structure, fertility, and water-holding capacity. Spread a layer of organic matter over the soil and incorporate it by tilling or digging. This will provide the watermelon plants with the necessary nutrients for healthy growth.

4. Improve Drainage

Watermelons require well-drained soil to prevent waterlogging, which can lead to root rot. If the soil in your garden has poor drainage, consider using raised beds or mounding the soil to improve water flow. Additionally, avoid overwatering to prevent water from accumulating around the roots of the watermelon plants.

5. Apply Fertilizer

Before planting the watermelon seeds, it is advisable to apply a balanced slow-release fertilizer, following the instructions on the packaging. This will provide the plants with the necessary nutrients throughout the growing season. Avoid using excessive amounts of fertilizer, as this can lead to excessive vegetative growth and poor fruit development.

Watermelon Varieties	Days to Maturity
Black Diamond	85-90
Sugar Baby	75-80
Jubilee	85-90

By following these guidelines and properly preparing the soil, you can create an ideal environment for growing watermelons in Wisconsin. Remember to monitor the soil moisture levels and avoid overwatering or underwatering the plants. With proper care, you can enjoy a bountiful harvest of delicious, juicy watermelons.

Sowing Watermelon Seeds

Once you have chosen the right variety of watermelon and prepared the soil, it’s time to sow the watermelon seeds. Follow these steps to ensure successful germination and healthy seedlings:

Step 1: Determine the Planting Time

Watermelons are warm-season crops, so it’s essential to sow the seeds after the danger of frost has passed. In Wisconsin, this is usually around late May or early June. Check the local weather forecast and soil temperature to determine the optimal planting time.

Step 2: Prepare the Seedbed

Before sowing the seeds, prepare the seedbed by removing any weeds and breaking up the soil. Watermelons prefer well-draining soil, so you may also need to amend the soil with organic matter, such as compost or aged manure.

Step 3: Space and Depth

Watermelon seeds should be spaced about 2 feet apart in rows, with at least 4-6 feet between rows. Make holes in the soil that are approximately 1 inch deep and place 2-3 seeds in each hole.

Step 4: Cover and Water

Once the seeds are in place, cover them with soil and gently pat it down. Water the newly planted seeds thoroughly, ensuring that the soil is consistently moist but not waterlogged.

Step 5: Provide Proper Care

As the watermelon seedlings emerge, thin them out by removing the weakest ones, leaving only the healthiest seedlings in each planting hole. Watermelon plants require plenty of sunlight and consistent watering throughout the growing season.

Step 6: Mulch and Monitor

Apply a layer of organic mulch around the plants to help conserve moisture and suppress weeds. Regularly monitor the plants for signs of pests or diseases, such as aphids or powdery mildew, and take appropriate measures to control them if necessary.

Following these steps will help you successfully sow watermelon seeds and establish healthy plants for a bountiful harvest. Remember to provide adequate water, sunlight, and care as your watermelons grow and develop.

Providing Adequate Water and Sunlight

Watermelons require a lot of water to grow and thrive, especially during hot summer months. It is important to provide them with adequate water to ensure proper fruit development and prevent wilting.

Watermelons should be watered deeply, allowing the water to reach the roots. This can be done either by hand watering or using a drip irrigation system. The soil should be kept consistently moist, but not waterlogged, as excessive moisture can lead to root rot and other diseases.

Sunlight is another crucial factor for the growth of watermelons. They need plenty of direct sunlight to produce sweet and juicy fruit. Choose a location in your garden that receives at least 6-8 hours of sunlight per day.

When planting watermelon seeds, make sure to space the plants properly to allow for good air circulation and sun exposure. Crowded plants can lead to poor fruit development and increased risk of disease.

During dry spells or heatwaves, it may be necessary to provide additional water to the plants. Monitor the soil moisture regularly to ensure it doesn’t dry out completely, especially during the fruiting stage.

Protect young watermelon plants from excessive heat by using mulch. Apply a layer of organic mulch around the base of the plants to help retain moisture in the soil and regulate the temperature.

Lastly, avoid overhead watering as it can promote the spread of diseases. Instead, water the plants at the base to minimize contact with the foliage.

By providing adequate water and sunlight, you can ensure healthy and productive watermelon plants that will reward you with sweet and refreshing fruit.

Managing Pests and Diseases

Watermelons can be susceptible to various pests and diseases, but with proper management, you can minimize damage and ensure healthy plants and fruits. Here are some tips for managing pests and diseases in your watermelon garden:

Pest or Disease	Symptoms	Management
Aphids	Sticky residue on leaves, curled and yellowing leaves	– Use insecticidal soap or neem oil to control aphid populations – Introduce natural predators like ladybugs or lacewings – Regularly inspect plants and remove affected leaves
Squash Bugs	Brown or yellow spots on leaves, wilting plants	– Handpick and remove squash bugs and eggs – Apply organic insecticides if necessary – Maintain good garden hygiene by removing plant debris
Fusarium Wilt	Yellowing and wilting of leaves, stunted growth	– Plant resistant varieties – Practice crop rotation – Avoid overwatering and water stress
Powdery Mildew	White powdery coating on leaves	– Use fungicidal sprays or sulfur dust – Promote good air circulation around plants – Remove infected plant parts
Root Knot Nematodes	Stunted growth, galls on roots	– Use resistant rootstock – Solarize the soil before planting – Practice crop rotation

Harvesting and Storing Watermelons

Once your watermelons are fully ripened, it’s time to harvest them. Here are some tips for harvesting and storing watermelons:

1. Timing: Watermelons are ready to be harvested when the tendrils near the fruit start to dry out, the bottom side turns yellow, and the skin becomes tough and resistant to scratching. If you tap the watermelon, it should sound hollow.

2. Cutting: Use a sharp knife or pruning shears to cut the watermelon from the vine, leaving a few inches of stem attached. Avoid pulling or twisting the fruit, as it can damage the vine.

4. Curing: After harvesting, it’s beneficial to cure the watermelons for about a week to increase their sweetness and flavor. This can be done by storing them at room temperature in a well-ventilated area.

5. Storing: Watermelons should be stored in a cool and dry place, such as a basement or fridge. They can last for up to two weeks if stored properly. However, once you cut into a watermelon, it should be consumed within a few days.

6. Seed Saving: If you want to save seeds from your watermelon, scoop out the seeds and rinse them in water. Spread them out on a paper towel to dry. Once they are completely dry, store them in a cool and dry place until the next planting season.

7. Enjoying: Now that you have harvested and stored your watermelons, it’s time to enjoy the sweet and juicy fruits of your labor! Watermelons are perfect for making refreshing salads, smoothies, or simply enjoying on their own.

By following these tips, you can ensure a successful watermelon harvest and enjoy the fruits of your labor all summer long!