Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
To plant watermelons from seeds, you start by choosing the right variety for your climate.
Watermelons grow from seeds, but whether you plant them directly in the ground or start them indoors depends on your growing season.
If you’ve ever wondered how to plant watermelons from seeds, the process is actually straightforward once you know the timing.
In this post, we’ll walk through how to plant watermelons from seeds step by step.
We’ll also cover how to plant watermelon seeds indoors, when to plant watermelons from seeds outdoors, and how to care for them so you get a sweet harvest.
Let’s dig in.
How to Plant Watermelons from Seeds
Knowing how to plant watermelons from seeds means giving them warmth, good soil, and plenty of space.
Here are the key steps to plant watermelon seeds the right way.
1. Choose the Right Watermelon Variety
Before you plant watermelons from seeds, pick a variety that suits your climate and space.
If you have a short growing season, choose an early-maturing type like Sugar Baby.
If you have room for vines to sprawl, larger varieties like Crimson Sweet work well.
When you plant watermelons from seeds, the variety also affects how long they take to ripen.
2. Start Seeds Indoors or Outdoors
You can plant watermelons from seeds either indoors or directly in the garden.
Watermelon seeds need warm soil to germinate, ideally between 70°F and 95°F.
If your soil is still cool, start seeds indoors about three to four weeks before the last frost.
When you plant watermelon seeds indoors, use biodegradable pots so you don’t disturb the roots later.
If you live in a warm climate, you can plant watermelons from seeds straight into the garden.
3. Prepare the Soil for Planting Watermelon Seeds
Watermelons love loose, well-draining soil rich in organic matter.
Before you plant watermelons from seeds, mix in compost and ensure the soil pH is between 6.0 and 6.8.
Plant watermelon seeds about one inch deep.
When you plant watermelons from seeds, space them three to five feet apart in rows six to eight feet apart.
If you plant watermelon seeds in hills, put four to six seeds per hill and thin to two or three seedlings.
4. Water and Warmth After You Plant Watermelons
After you plant watermelons from seeds, keep the soil consistently moist but not soggy.
Watermelon seeds germinate faster in warm soil, so consider using black plastic mulch to trap heat.
When you plant watermelons from seeds, avoid overwatering, which can cause rot.
Once seedlings appear, water deeply once a week to encourage strong roots.
5. Thin and Care for Seedlings
Once your watermelon seeds sprout, thin them so the strongest plants have room to grow.
If you plant watermelons from seeds in pots, transplant them carefully after the last frost.
When you plant watermelons from seeds, harden off indoor seedlings before moving them outside.
Feed your plants with a balanced fertilizer once they start vining.
When to Plant Watermelons from Seeds
Timing matters when you plant watermelons from seeds.
Here’s when to plant watermelon seeds for the best results.
1. Wait for Warm Soil
The best time to plant watermelons from seeds is when soil temperatures stay above 70°F.
If you plant watermelons from seeds too early, the seeds may rot instead of sprout.
2. After the Last Frost
Plant watermelons from seeds outdoors only after all danger of frost has passed.
In cooler regions, start seeds indoors and transplant when the weather warms.
3. Count Back from Harvest
Watermelons need 70 to 100 days to mature, depending on the variety.
If you plant watermelons from seeds, count back from your first expected frost date to ensure they finish ripening.
Tips for Growing Watermelons from Seeds
Once you plant watermelons from seeds, a few extra tips help them thrive.
1. Give Them Plenty of Sun
Watermelons need at least six to eight hours of direct sunlight daily.
When you plant watermelons from seeds, choose the sunniest spot in your garden.
2. Keep Pollinators Around
Bees are essential for watermelon pollination.
If you plant watermelons from seeds, avoid pesticides that harm pollinators.
3. Watch for Pests and Diseases
Aphids, squash bugs, and powdery mildew can affect watermelons.
When you plant watermelons from seeds, rotate crops and keep the garden clean to reduce problems.
So, How to Plant Watermelons from Seeds?
To plant watermelons from seeds, pick the right variety, wait for warm soil, and give them sun, space, and steady moisture.
Whether you plant watermelons from seeds indoors or directly in the garden, the key is warmth and patience.
Now that you know how to plant watermelons from seeds, you’re ready to grow your own sweet, juicy harvest.
Happy planting.