How to Grow Watermelons in Oregon – A Comprehensive Guide

Try this watermelon growing method – Easy but the results are amazing

Choosing the Right Watermelon Variety

Selecting the appropriate watermelon variety is crucial for successful cultivation in Oregon’s climate. Different varieties have varying maturity periods, disease resistance, and suitability for specific growing conditions. Here’s a comparison of some popular watermelon varieties suitable for Oregon:

VarietyTypeDays to MaturityDisease ResistanceNotes

Sugar Baby	Seeded	75-85	Anthracnose, Fusarium Wilt	Small, icebox type
Crimson Sweet	Seeded	85-95	Anthracnose, Fusarium Wilt	Large, oblong shape
Millionaire	Seedless	80-90	Anthracnose, Fusarium Wilt	Medium size, sweet flavor
Yellow Doll	Seeded	70-80	Anthracnose, Fusarium Wilt	Small, yellow flesh

Seeded vs. Seedless Varieties

Seeded watermelon varieties are generally easier to grow and more reliable, but seedless varieties offer a more convenient eating experience. Seedless varieties require specific pollination techniques and may be more challenging for novice growers.

Days to Maturity

Oregon’s growing season can be shorter than other regions, so choosing a variety with a shorter maturity period (70-90 days) is essential. Longer-season varieties may not have enough time to fully ripen before the first frost.

Disease Resistance

Look for varieties with resistance to common watermelon diseases like anthracnose and fusarium wilt. Disease-resistant varieties can better withstand Oregon’s humid conditions and reduce the need for chemical interventions.

Preparing the Soil for Watermelon Cultivation

Proper soil preparation is crucial for how to grow watermelons in Oregon successfully. Watermelons thrive in well-draining, nutrient-rich soil with a slightly acidic to neutral pH.

Soil Testing

Before planting, test your soil’s pH and nutrient levels. Watermelons prefer a soil pH between 6.0 and 6.8. Soil testing kits are readily available and provide valuable information to guide soil amendments.

Amending the Soil

Based on your soil test results, amend the soil with organic matter like compost or aged manure to improve drainage and nutrient content. Watermelons are heavy feeders and may benefit from additional fertilizers, such as a balanced 10-10-10 fertilizer or a specific vegetable fertilizer.

Raised Beds or Hills

Watermelons often perform better when grown in raised beds or hills. Raised beds improve drainage and warm the soil more quickly in the spring. Hills, which are small mounds of soil, allow the vines to trail downward and provide excellent drainage.

Planting and Caring for Watermelon Plants

Proper planting and ongoing care are essential for a bountiful watermelon harvest in Oregon.

Direct Sowing vs. Transplanting

Watermelons can be grown from seed directly sown in the garden or started indoors and transplanted later. Direct sowing is easier but may result in a shorter growing season. Transplanting allows for an earlier start and can extend the growing period, but care must be taken to avoid damaging the roots.

Spacing and Depth

Proper spacing is vital for watermelon plant growth and fruit development. Here are some spacing recommendations for different watermelon varieties:

• Small (icebox) varieties: 2-3 feet between plants, 5-6 feet between rows
• Medium varieties: 3-4 feet between plants, 6-8 feet between rows
• Large varieties: 4-6 feet between plants, 8-10 feet between rows

Plant seeds or transplants at a depth of 1-2 inches in well-prepared soil.

Mulching

Mulching is highly recommended for watermelon cultivation. A 2-4 inch layer of organic mulch, such as straw or wood chips, helps retain soil moisture, suppress weeds, and moderate soil temperatures.

Watering

Watermelons require consistent moisture, especially during fruit development. Water deeply and regularly, providing about 1-2 inches of water per week. Avoid overhead watering, which can promote fungal diseases.

Pest and Disease Management

Monitor your watermelon plants regularly for signs of pests or diseases. Common watermelon pests include aphids, cucumber beetles, and squash bugs. Diseases like powdery mildew, anthracnose, and fusarium wilt can also be problematic. Implement organic control methods, such as insecticidal soaps, neem oil, or crop rotation, to manage pests and diseases.

Harvesting and Storing Watermelons

Proper harvesting and storage techniques are essential for enjoying your watermelon harvest to the fullest.

Signs of Maturity

Knowing when to harvest watermelons is crucial to ensure optimal flavor and quality. Here are some signs that your watermelons are ready for harvest:

1. The underside (where the melon rests on the ground) turns from white to creamy or yellow.
2. The tendril closest to the melon stem turns brown and dries up.
3. The melon develops a dull, hollow sound when tapped.
4. The rind loses its glossy appearance and becomes rough or dull.
5. The watermelon feels heavy for its size.

Harvesting Techniques

When harvesting watermelons, use a sharp knife or pruning shears to cut the stem about 2-3 inches from the fruit. Avoid pulling or twisting the melon, as this can damage the plant or other developing melons. Handle the harvested melons carefully to prevent bruising or damage.

Storage

Watermelons can be stored at room temperature for up to two weeks or refrigerated for up to four weeks. Keep them in a cool, dry place, and avoid stacking or putting pressure on the melons, which can cause them to spoil more quickly.

Conclusion

Growing watermelons in Oregon requires patience, attention to detail, and a commitment to following best practices. By choosing the right variety, preparing the soil properly, and providing optimal care throughout the growing season, you can enjoy a bountiful harvest of sweet, juicy watermelons. With this comprehensive guide, you now have the knowledge to successfully cultivate watermelons in Oregon’s climate. So, get ready to roll up your sleeves and embark on the rewarding journey of watermelon growing!