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Growing watermelon in the ground is one of the most rewarding gardening projects you can take on.
It takes patience, plenty of sunshine, and a little know-how, but the payoff is sweet, juicy fruit you grew yourself.
If you’ve been wondering how to grow watermelon in the ground, you’re in the right place.
Watermelons love warm soil, lots of space, and consistent watering, and when you give them those things, they practically take care of themselves.
In this post, we’ll walk through how to grow watermelon in the ground from seed to harvest, covering everything from planting and soil prep to watering, feeding, and knowing when to pick.
Let’s dig in.
How to Grow Watermelon in the Ground: Getting Started
Learning how to grow watermelon in the ground starts with picking the right spot and preparing your soil.
Watermelons are heavy feeders and thirsty plants, so a little upfront work goes a long way.
Here’s what to focus on first.
1. Choose a Spot With Full Sun
Watermelons need at least 8 to 10 hours of direct sunlight every day.
The more sun they get, the sweeter your harvest will be.
Pick a spot in your garden that isn’t shaded by trees, fences, or buildings during the day.
If you’re serious about how to grow watermelon in the ground, sun is non-negotiable.
2. Wait for Warm Soil
Watermelons hate cold soil, so don’t rush planting.
Wait until the soil temperature is at least 70°F (21°C) and all danger of frost has passed.
In most regions, that means planting two to three weeks after your last expected frost date.
If your soil is still chilly, your seeds may rot instead of sprouting.
3. Prepare Loose, Rich Soil
Watermelons grow best in loose, well-draining soil that’s rich in organic matter.
Mix in plenty of compost or aged manure before planting to give your vines a strong start.
Aim for a soil pH between 6.0 and 6.8 for the best results.
Good drainage matters too, because soggy roots lead to rot and weak plants.
Planting Watermelon in the Ground
Once your soil is ready, planting is the fun part.
Here’s how to plant watermelon in the ground the right way.
1. Space Your Plants Properly
Watermelon vines sprawl, so give them room.
Plant seeds or transplants about 3 feet apart in rows that are 6 to 8 feet apart.
If space is tight, you can grow them on mounds, but crowding leads to poor airflow and disease.
2. Plant Seeds or Transplants
Sow seeds about 1 inch deep, placing 2 to 3 seeds per spot.
Once they sprout, thin them to leave the strongest seedling.
If you’re using transplants, set them in the ground at the same depth they were growing in their pot.
Water gently after planting to settle the soil around the roots.
3. Add a Layer of Mulch
Mulch helps retain moisture and keeps weeds down.
Spread straw or compost around your plants, but keep it a few inches away from the stems.
This is one of the easiest ways to support how watermelon grows in the ground.
Watering and Feeding Your Watermelon
Watermelons are thirsty, but they don’t like wet feet.
Getting the balance right is key to healthy vines and sweet fruit.
1. Water Deeply and Regularly
Give your plants about 1 to 2 inches of water per week.
Water deeply at the base of the plant rather than splashing the leaves.
Consistency matters most, especially while the fruit is developing.
Drip irrigation or a soaker hose works great for growing watermelon in the ground.
2. Feed With a Balanced Fertilizer
Start with a balanced fertilizer when vines begin to run.
Once flowers appear, switch to a formula lower in nitrogen and higher in phosphorus and potassium.
Too much nitrogen gives you lots of leaves but few melons.
3. Watch for Pests and Disease
Keep an eye out for aphids, cucumber beetles, and powdery mildew.
Good airflow and proper spacing help prevent problems before they start.
Remove any diseased leaves promptly to keep the rest of the plant healthy.
Harvesting Watermelon Grown in the Ground
Knowing when to harvest is the final piece of how to grow watermelon in the ground.
Here’s how to tell your melons are ready.
1. Check the Tendril
Look at the curly tendril closest to the fruit.
When it turns brown and dries up, your watermelon is ripe.
2. Look for a Creamy Spot
Roll the melon over and check the underside.
A ripe watermelon has a creamy yellow spot where it rested on the ground.
If the spot is white or green, give it more time.
3. Listen for the Thump
Give the melon a firm knock with your knuckles.
A ripe watermelon gives a deep, hollow sound.
A dull thud usually means it’s not quite ready yet.
So, How Do You Grow Watermelon in the Ground?
You grow watermelon in the ground by giving them full sun, warm soil, plenty of space, and consistent watering.
Start with rich, well-draining soil, plant after the last frost, and feed them wisely as they grow.
Then watch for the signs of ripeness, like a dried tendril and a creamy spot underneath.
With a little patience and care, growing watermelon in the ground can reward you with some of the sweetest fruit you’ll ever taste.
Happy gardening.