How to Grow Watermelons

Updated on January 28, 2020
OldRoses profile image

Caren White is a Master Gardener and instructor at Home Gardeners School. She has been associated with Rutgers Gardens for over a decade.

Nothing beats a nice, juicy watermelon on a hot day.
Nothing beats a nice, juicy watermelon on a hot day. | Source

For me, watermelon has always been the taste of summer. It reminds me of long, hot, lazy summer afternoons. The refreshing flavor of a slice of watermelon is a great way to cool off.

What are Watermelons?

Watermelons (Citrullus lanatus) are members of the cucurbit family which includes squash, cucumbers and zucchini. The plants are large vines that produce fruit.

Watermelons have a long history. They are native to North Africa so it is not surprising that they have been found in Egyptian tombs. They are also mentioned in the Bible. They made their way along the Silk Road to China where they have been grown since the 10th century. The Moors introduced watermelons to Europe when they invaded in the 13th century. And the Europeans introduced them to the New World when they colonized it in the 16th and 17th centuries. The Native Americans quickly adopted the watermelon and added it to their diets.

How to Prepare Your Garden to Grow Watermelons

Watermelons require heat, a long growing season, and plenty of nutrients. They are heavy feeders. Enrich your soil with compost or well-rotted manure. You may want to lay down a layer of black plastic to warm the soil.

Choose a spot in your garden where cucurbits such as cucumbers, squash, or zucchini were not grown the year before. This prevents the spread of disease. Make sure you have enough space. Watermelon vines can grow up to 20 feet in length.

How to Grow Watermelons From Seed

Depending on the variety, watermelons require a growing season of 70 to 90 days. In northern climates with a shorter growing season, seeds should be started indoors one month before the last frost date. Use biodegradeable pots such as peat pots to avoid damaging the roots when you transplant them into your garden. Plant three to four seeds 1/2" deep and thin them to the best one after they germinate. Always thin by cutting the seedlings at the soil line. Pulling them up out of the peat pot will disturb the roots of the remaining seedling and possilibly kill it.

Grow tyour seeds (and later seedlings) on a heat mat so that they attain a temperature between 70°F and 80°F. You can (carefully) transplant your seedlings into your garden two weeks after your last frost unless you are growing in peat pots. Peat pots can be transplanted directly into your garden.

In warmer climates with a longer growing season, you can direct sow your seeds into your garden two weeks after your last frost. The soil should be a minimum of 70°F for them to germinate. You can warm your soil by covering it with black plastic.

How to Grow Watermelons

Watermelons like good drainage, so it is best to plant them in hills. You can direct sow your seeds into your garden after the soil warms. Plant 8 to 10 seeds 1" deep in each 5' wide hill and thin to the three best seedlings after germination. Always thin by cutting off the unwanted seedlings at the soil line. Never pull them up. That can disturb the roots of the remaining seedlings possibly killing them.

Hills should be 3' to 4' apart. If you are instead planting in rows, space your plants 6' apart and your rows 6' apart. Remember, the vines will be very long, and you don't want to crowd your plants. Doing so encourages disease such as powdery mildew.

It's a good idea to protect your young plants from cool weather and pests with floating row covers. You will need to keep them covered for about six weeks, until the plants have developed flowers.

Begin regular watering as soon as your seedlings have emerged. Watermelons require 1" to 2" of water each week. To judge when your seedlings need to be watered, stick your finger in the soil. If it is dry up to the first knuckle on your finger, it is time to water. Adding mulch to your garden will keep the soil moist and discourage weeds, which will compete with your vines for water and nutrients.

Watermelons have male and female flowers.  The female flowers have the beginnings of a watermelon.
Watermelons have male and female flowers. The female flowers have the beginnings of a watermelon. | Source

Watermelons have male and female flowers. They depend on bees to get the pollen from the male flowers to the female flowers. When your vines start developing flowers, you should remove your row covers so that the bees can reach the flowers to pollinate them. The vines will develop male flowers first. This attracts the bees so that they are accustomed to visiting your watermelons every day. Two weeks later, the female flowers will appear. You can easily tell male from female flowers. Female flowers are the ones with the tiny watermelons at the base of the flower.

Cut back on watering when the fruit reaches the size of a tennis ball. Too much water will reduce the flavor of the fruit. A watermelon is 90% water. It is sweeter if you water it less. As your watermelons grow, place a bed of straw or a piece of cardboard under them to keep them off the soil and prevent rot.

Harvested watermelons.  Note the white spots indicating that the fruit is ripe.
Harvested watermelons. Note the white spots indicating that the fruit is ripe. | Source

How to Harvest Watermelons

How do you know when your watermelons are ripe? Many people use the "thump" method. If you thump a watermelon and it sounds hollow, it is ripe. The problem with this method is that it could damage your fruit. Others look at the stem that attaches the watermelon to the vine. If it is brown and appears dead, then the fruit must be ripe. This is not always true for all varieties. Some are not ripe until up to two weeks after the stem "dies."

The best way to tell if your watermelon is ripe is to look at the white spot on the bottom. It will be white as the fruit ripens and then darken to a cream color, or even yellow, when the watermelon is fully ripe.

Use your pruners or a sharp knife to cut the stem rather than pulling it off the vine, which can damage both the vine and the fruit.

How to Store Watermelons

After harvest, your watermelon will last up to 10 days unrefrigerated. If you cut it into quarters or slices, wrap them tightly in plastic wrap and store them in your refrigerator for up to four days.

© 2014 Caren White


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    • OldRoses profile imageAUTHOR

      Caren White 

      5 years ago

      Raimer, here in the US many people grow them successfully in their backyards. Try it! Thank you for reading and commenting.

    • profile image

      Raimer Gel 

      5 years ago

      Melons are the definite superstar fruits of summer. I wonder if I can grow them at home too. In our place, melons are only grown by full time farmers.

    • OldRoses profile imageAUTHOR

      Caren White 

      5 years ago

      Thanks, tobusiness! Glad to hear that you are a seedsaver. Enjoy your melons next summer. Thank you for reading and commenting.

    • tobusiness profile image

      Jo Alexis-Hagues 

      5 years ago from Lincolnshire, U.K

      I've already collected my melon seeds, thank you for this, let's hope I'll be enjoying melons next summer.:)

      Great informative hub.

    • OldRoses profile imageAUTHOR

      Caren White 

      5 years ago

      Me too, Pawpaw! No space but a huge love of watermelon. Thank you for reading and commenting.

    • OldRoses profile imageAUTHOR

      Caren White 

      5 years ago

      Jainismus, you're welcome! I adore watermelon in the summer. It's so cool and refreshing. Thank you for reading and commenting.

    • Pawpawwrites profile image


      5 years ago from Kansas

      This is one of the few things I don't grow, because of space, but I sure do love to eat them.

    • jainismus profile image

      Mahaveer Sanglikar 

      5 years ago from Pune, India

      Well written and very useful Hub. Watermelon is one of my favorite fruits and I am thankful to you for writing this hub.

      Shared on my hubapages.

    • OldRoses profile imageAUTHOR

      Caren White 

      6 years ago

      Agreed, Sunshine! There's nothing better than a slice of cold watermelon on a hot summer day. Thanks for reading.

    • Sunshine625 profile image

      Linda Bilyeu 

      6 years ago from Orlando, FL

      Awesome gardening tips for the watermelon lovers, such as myself. I've never attempted to grow them, but living in Florida, I find watermelon very refreshing when I need to cool off.

    • OldRoses profile imageAUTHOR

      Caren White 

      6 years ago

      Hi Ginger! So glad that you found it helpful. I didn't know about the watering. I will be using it in my own garden this year. Thanks for reading.

    • ExpectGreatThings profile image


      6 years ago from Illinois

      I wish I had read this before I attempted to plant. At least I'll do the watering and harvesting part right :) This is great information that I will be using. Thanks! - Ginger

    • OldRoses profile imageAUTHOR

      Caren White 

      6 years ago

      Lisa, sounds like you are doing all the right things. I'm sure that you will have watermelons this summer. Thanks for reading.

    • LisaRoppolo profile image

      Lisa Roppolo 

      6 years ago from Joliet, IL

      I have always had trouble with watermelon in my region. I think I finally am having luck this year. I started my seeds indoors 6 weeks before my last frost date and chose a variety that was more suitable for my northern garden. Out of 6 seedlings, 4 are doing really well. As long as the weather remains toasty this summer, I should have melons! I've noticed in cooler summers that my watermelon attempts were failures. Fortunately, I think we are in an el nino pattern this summer.


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