Do you wonder how to grow watermelon? Watermelons flourish on expansive vines during the hottest months. These sun-loving plants can either spread along the ground or, for smaller types, climb a sturdy trellis. Limited on space? No problem—you can also grow watermelons in large pots.
Watermelon flesh isn’t always red; it can be orange, white, or yellow, depending on the variety. Watermelon sizes differ greatly depending on the variety, care, and purpose. That brings us to the first question.
How Much Does a Watermelon Weigh?
The weight of a watermelon varies significantly depending on its variety and growing conditions. On average:
- Mini Watermelons: These typically weigh between 5 to 10 pounds (2.3 to 4.5 kg).
- Seedless Watermelons: These generally weigh between 10 to 20 pounds (4.5 to 9 kg).
- Seeded Watermelons: These can range from 15 to 45 pounds (6.8 to 20 kg), with some varieties even larger.
The largest watermelons, often grown for competitions, can weigh over 300 pounds (136 kg).
The Guinness Book of Records reports that on October 4, 2013, Christopher Kent from Sevierville, Tennessee, USA, was awarded for growing the world’s heaviest watermelon weighing 159 kg (350.5 lb).
Relate: How Many Strawberry Plants Per Square Foot?
Varieties and Climate Preferences
Watermelons come in various shapes, sizes, and colors. They are sensitive to frost and favor hot, dry climates.
In cooler areas, plant watermelons in spring after the last frost and when the soil has warmed to 18-22°C. Choose varieties that mature quickly; many need over 100 days from planting to harvesting.
Watermelons can be grown year-round in warmer, tropical regions; select varieties that can handle humid conditions during wetter seasons.
Also read:
- Why Are My Strawberry Plants Drooping?
- Why is My Strawberry Plant Wilting?
- Why Are My Strawberry Leaves Turning Red?
Benefits of Eating Watermelon Seeds
Watermelon seeds offer numerous health benefits, namely:
- Rich in protein
- Good source of healthy fats
- High in magnesium
- Support heart health
- Boost immune system
- Aid in digestion
- Contain iron
- Enhance skin health
- Support hair growth
- Provide essential amino acids
- Rich in antioxidants
- Promote healthy metabolism
- Contain zinc
- Improve bone health
- Aid in diabetes management
Also read: How Long for Watermelon Seeds to Germinate?
How Long for Watermelon Seeds to Germinate?
Watermelon seeds typically germinate about 4-12 days when the soil temperature is between 18-22°C. In cooler climates, you can start the seeds indoors using small pots or outdoors using raised container beds such as the Metal Raised Garden Bed with Trellis (see picture above ⬆) and a heat mat if necessary to maintain the ideal temperature.
How to Grow Watermelon Step-by-Step Guide
- Select a sunny location: Choose a spot in your garden with full sun or use large pots if space is limited.
- Use a sturdy support: Smaller fruit varieties can be grown vertically on a trellis or in large pots.
- Improve soil quality: Enhance the soil with organic matter like compost and specific plant food tailored for vegetables and herbs.
- Protect seedlings from pests: Use products like Defender Slug & Snail Pellets to guard young plants against pests.
- Start seeds indoors if necessary: In cooler regions, sow seeds in small pots or punnets indoors before transplanting them outside.
Where to Buy Watermelon Seeds
You can purchase watermelon seeds from various suppliers. One convenient option is Amazon, where various watermelon seeds are suitable for different climates and preferences. Check out watermelon seeds on Amazon (picture above ⬆).
Preparing the Soil
Watermelons thrive in rich, well-draining soil. Prepare your garden bed by mixing in organic compost and a balanced plant food. If you’re growing watermelons vertically, set up the support structure before planting to avoid disturbing the roots later.
Planting in the Garden
From seedlings: Plant watermelons 80-100cm apart, depending on the variety. Space them further apart in humid climates for better airflow and disease prevention. Lightly mulch around the plants to retain moisture.
From seeds: In warmer climates, direct sow seeds 1-2cm deep in clusters of 2-4, spaced 80-100cm apart. Thin to the strongest seedling in each cluster once they germinate. In cooler climates, start seeds indoors in small pots and transplant them outside when the soil has warmed.
Growing Watermelons in Pots
Use large pots (40-50cm deep) filled with quality potting mix. Install a trellis or place the pot near a sturdy fence. Sow 3-4 seeds at the base of the trellis and thin to the strongest seedling. Mulch around the plant to retain moisture and protect it from pests.
Related: What to Put Under Watermelons While Growing
Care & Harvest
Fertilize watermelons 30-50 days after planting with an organic fertilizer. Limit each plant to 3-4 fruits by pinching out the growing tips of the vines to concentrate energy on the remaining fruits. Harvest watermelons around 80-100 days after planting when the skin turns dull and the underside changes from white to creamy yellow. Cut them from the vine carefully with scissors.
Pests & Diseases
Protect young seedlings from slugs and snails with pellets or beer traps. Avoid overhead watering to prevent fungal diseases. In regions with high humidity, choose varieties that tolerate these conditions and ensure good airflow between plants. For aphids, use insecticidal soap or sprays.
By following these guidelines, you can enjoy a bountiful harvest of delicious watermelons.
How to Grow Watermelon Frequently Asked Questions
Q: How much sunlight do watermelons need?
A: Watermelons require full sun, meaning they need at least 6-8 hours of direct sunlight daily.
Q: How often should I water my watermelon plants?
A: Watermelons need consistent moisture, especially during fruit development. Water deeply once a week, ensuring the soil remains moist but not waterlogged.
Q: When should I harvest my watermelons?
A: Harvest watermelons when the skin changes from shiny to dull and the underside turns white to creamy yellow. This usually occurs around 80-100 days after planting.
Q: Can I grow watermelons in containers?
A: Smaller watermelon varieties can be grown in large pots that are at least 40-50cm deep. Ensure they receive ample sunlight and support them with a sturdy trellis if needed.
Final Thoughts on How to Grow Watermelon
Growing watermelons can be a rewarding experience, providing a plentiful harvest of sweet, refreshing fruits. You can enjoy watermelons even in limited space by selecting the right variety, preparing the soil properly, and giving your plants the care they need. Protect young plants from pests and diseases and closely monitor their growth. You can savor the delicious taste of homegrown watermelons with patience and attention.