Plant Care Watermelon


About Watermelon

Watermelon is an annual, prostrate, vining vegetable that produces large, spherical to oval, edible fruits. It is a member of the Cucurbitaceae (cucumber) family. Watermelon is easily grown from seed and does best in areas with long warm summers.


Citrullus lanatus

How to care for Watermelon

💦 Water

How often to water your Watermelon

Water needs for Watermelon
0.5 cups
every 9

Watermelon needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Calculate water needs of Watermelon

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size

☀️ Light

Finding light for Watermelon in your home

Light needs and placement for plant Watermelon: 1ft from a window
1ft or less from
a window

Watermelon love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Watermelon does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Watermelon in your home 🏡.

🪴 Nutrients

How to fertilize Watermelon

Nutrient, fertilizer, and repotting needs for Watermelon: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Watermelon after it doubles in size or once a year—whichever comes first.

💡 FAQs
⭐ Difficulty Level

Watermelon is generally easy to care for, though some plant parents report facing challenges with growing it. Check out the reviews down below to read more about their experiences!

Benefits of Growing Watermelon →

Common Watermelon Problems →

💦 Water Needs

Watermelon prefers for the soil to dry out between waterings and should be watered regularly. Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Watermelon Water Frequency →

Watermelon Root Rot →

☀️ Sunlight Needs

Watermelon requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.

Watermelon Light Requirements →

Watermelon Direct Sunlight Needs & Tolerance →

🐶 🐈 👶 Toxicity

Greg does not have confirmed data on this plant’s toxicity. If you, a family member, or a pet consumes plant material of unknown toxicity, it’s always best to consult a medical professional.

If you or someone else ingested this plant, call Poison Control at US (800) 222-1222. If a pet consumed this plant, contact your veterinarian or the ASPCA at US (888) 426-4435.

🪴 Soil

Watermelon does best in well-draining soil. A good soil will contain lots of organic matter such as coco coir as well as perlite or vermiculite to help with drainage. Adding a handful of perlite to regular store-bought potting soil should do the trick!

Best Soil Mix for Watermelon →

When and How to Successfully Repot Watermelon →

💩 Fertilizer

Watermelon should be repotted after it doubles in size or once a year, whichever comes first. Fresh potting soil has all the nutrients your plant needs, so as long as it’s refreshed yearly, you shouldn’t need to use fertilizer. Remember, plants get their energy from sunlight, not fertilizer!

⬆️ ⬇️ Growth Pattern

Watermelon grows along the ground and sends out shoots which will spread across the soil.

How and When to Prune Watermelon →

🌦️ Growing Outdoors

USDA Hardiness Zone
Watermelon can be grown outdoors in USDA Hardiness Zones 2a-11b. Find your local hardiness zone here.

Watermelon Temperature Tolerance →

🌱 Propagation

The seeds of Watermelon can be used to grow new plants! After your plant flowers, any seeds that formed can be collected and germinated in potting soil.

How to Propagate Watermelon →

🧐 Troubleshooting

When troubleshooting a sad-looking houseplant, start by checking for signs of distress in its leaves, such as yellowing, browning, or drooping, which can indicate overwatering or nutrient deficiencies.

Inspect the soil moisture; too dry or too wet soil can cause problems.

Ensure the plant is getting the right amount of light, as too much or too little can stress it.

Finally, consider environmental factors like temperature and humidity, and adjust care routines accordingly to revive your plant.

Care Summary for Watermelon



Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

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