How to Grow Melons
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How to grow melons starts with space and heat. Melons are warm-season plants with a long growing season, and they need more room than most garden crops. The four extension pages we opened agree on sun, warm soil and steady water, but they differ on spacing, sun hours and how to tell when fruit is ripe. This guide lists those differences so you can plan a patch that suits your garden.
Quick answer
- Plant after the last frost, when the soil is warm, and give the vines full sun.
- Space plants widely. Clemson gives 18 to 24 inches in the row and 6 to 8 feet between rows for cantaloupe and honeydew.
- Water deeply and steadily while the fruit sets and grows, then ease off as the fruit begins to ripen.
- Check the signs for each type. Muskmelons slip from the stem, and watermelons show a yellow underside.
Know which melon you are growing
The word “cantaloupe” can mean different fruit. Clemson Extension says “no true cantaloupes are actually grown commercially in the United States”, and that the name “has become the generic name of all netted, musk-scented melons”. Those netted melons are muskmelons. University of Maryland Extension adds that true cantaloupes, such as ‘Charentais’, are usually smaller, are not netted, and “do not slip from their stems when ripe”.
Honeydew is another group. Clemson says honeydew melons “usually have green or white flesh, although some newer varieties may have orange or pink flesh”. Watermelon is in a separate species. Maryland Extension notes that watermelon vines “range in length from 6 ft. (bush types) to 20 ft.”, so the plant needs a larger garden than most muskmelons. Plan the patch around the type you plan to eat.
Pick a site with sun and room
Sun is the first rule, though the pages give different hour counts. University of California Agriculture and Natural Resources says “Melons do best if they receive full sunlight (at least 4 to 6 hours a day)”. Maryland Extension is stricter, saying full sun requires direct light at least 6 hours a day and that melons prefer 8 to 10 hours. If your plot gets less than 6 hours, take the stricter number as your target.
UC ANR advises planting where the vines are “not shaded by trees, fences, or walls”. It also recommends choosing an area near an abundant supply of water, and planting on level ground. For soil, UC ANR says “Melons will do well on a wide range of soils; they do best in well-drained soils”, and it puts the target pH at 6.0 to 6.5. Clemson says melons need a lot of space, and it adds that “Cantaloupes and honeydews need a lot of space in the garden”. If your bed is small, see raised bed companion planting and layout for ways to plan around a large plant.
Start with warm soil
Melons do not tolerate cold. Clemson says “These melons are very tender and should be planted after the last chance of frost”. It adds that cantaloupe and honeydew grow best at average air temperatures between 65 and 75 degrees Fahrenheit, and that planting is best when the soil reaches at least 60 to 65 degrees. Maryland Extension gives the same rule in plainer words: direct sow “when all danger of frost is past and the soil is warm”.
Transplants buy time. Clemson says that “Under normal conditions melons grown from transplants can be harvested as much as two weeks earlier than melons grown directly from seed”. Maryland Extension gives a larger gain, saying melons grown from transplants can be harvested “as much as four weeks earlier”. Maryland also advises starting seed indoors 3 weeks before transplanting for an earlier fruit. The two pages differ on the size of the gain, so count your own weeks before you decide.
Black plastic mulch is another early-season tool. Clemson says the plastic “absorbs the sun’s warmth, allowing the soil to warm quickly”, and that it also conserves moisture and controls weeds. Maryland Extension says muskmelons and watermelons grown on black plastic or black landscape fabric “will produce larger and earlier harvests”. Use a soaker hose or drip line under the plastic if you can, as Maryland suggests.
Plant in hills or rows
The sources describe two layouts, hills and rows. Iowa State University Extension says muskmelon and watermelon “are usually planted in hills”. It advises planting 4 or 5 seeds per hill at a depth of 1 inch, then removing all but 2 or 3 healthy plants per hill once seedlings have 1 or 2 true leaves. Clemson uses rows and says to plant seed about one-half to three-quarters of an inch deep.
| Source | Muskmelon or cantaloupe | Watermelon |
|---|---|---|
| Clemson HGIC (cantaloupe and honeydew) | Rows 6 to 8 feet apart; plants 18 to 24 inches apart in the row | Not stated |
| University of Maryland Extension | Plants 24 inches apart in the row; rows 60 to 72 inches apart | 3 to 4 feet apart in the row; rows 6 to 7 feet apart |
| Iowa State University Extension | Hills 3 to 5 feet apart; 5 to 7 feet between rows | Hills and rows 6 to 8 feet apart |
| UC ANR Cultural Tips | Rows 4 to 6 feet apart, depending on the crop | Not stated |
The table shows the spread. Clemson’s 6 to 8 foot rows are wider than the 60 to 72 inches Maryland Extension gives for muskmelon. If space is tight, Iowa State University Extension says “If garden space is limited, bush-type varieties of muskmelon and watermelon are available”. Maryland Extension says most cultivars “are not well suited to small gardens because of the large space requirement”.
Vines can be trained to save room. Maryland Extension suggests you “Lift and move vines so they grow in one or two directions”, which “saves space and keeps your garden orderly”. Growing on a trellis lets you plant closer, but Maryland warns that each trellised melon must be supported “by a sling made of a material that dries quickly to prevent rot”.
Feed the plants
Clemson recommends a soil test first. If there is no test, it says to “apply 5-10-10 at 30 pounds per 1,000 square feet before planting”. It also recommends sidedressing before the vines start to run, and a second sidedressing after bloom when fruit is developing. UC ANR gives a smaller rate, 1 to 2 pounds of mixed fertilizer per 100 feet of row, placed in a band beside the row.
Nitrogen needs a light hand. Clemson warns that “Applying too much nitrogen fertilizer or planting too close can cause the plant to produce a lot of vine growth and very little fruit”. Maryland Extension says “Side-dressing with excessive nitrogen may lower yield and quality”, and it notes that late-maturing varieties may need extra fertilizer at fruit set.
Water deeply, then ease off
Water is the daily job. Clemson says “Melons need a lot of water”, and it recommends making sure the soil is moistened “to a depth of at least 6 inches” when you water. UC ANR recommends applying water to a depth of one foot to encourage deeper rooting. Maryland Extension says to keep plants “well-watered during establishment and fruit expansion”.
Drip irrigation comes up on several pages, and it is the method for keeping water off the leaves. Clemson says “Using drip irrigation instead of overhead irrigation keeps the foliage dry and reduces disease problems”. If you use overhead watering, Clemson says to water in the morning, so the foliage can dry before dark. For hose options, see hose attachments for watering plants. Stop watering near ripening. Maryland Extension advises that “Unless a prolonged dry spell strikes, stop watering when the fruits begin to ripen”, because that improves flavor and lowers the risk of splitting.
Pollination and fruit set
Poor fruit set is often a pollination problem. Clemson says “lack of pollination by bees is one of the most common causes” of poorly formed fruit or too few fruit. Maryland Extension notes that “Poor melon set is common during rainy weather when bees are inactive”. Watermelon is more demanding. Maryland says “pollen must be carried by bees from a male flower to a female flower”, and seedless watermelons need a seeded variety planted nearby to set fruit.
The fruit count matters too. Maryland Extension gives an approximate yield of 2 to 4 fruit per plant, depending on type and cultivar. Keep the plants well spaced, feed lightly, and make sure bees can reach the flowers.
Know when to pick
Each type has its own sign. Clemson says that for most cantaloupe varieties, “About 30 to 35 days are required from fruit pollination to harvest”. It describes the ripe stage as “full slip”, which is when “the stem separates completely”. Maryland Extension says muskmelons are at their peak for flavor when picked at full slip, “which is when the stem separates easily at the point of attachment”.
The other pages use different signs. UC ANR says to harvest “when a slight crack completely circles the stem where it is attached to the fruit”. For honeydew, Crenshaw or casaba, it says to harvest “when the fruit softens at the blossom end and starts to turn yellow”. Maryland Extension says honeydew and Crenshaw are cut from the vine “after they turn completely yellow”. For watermelon, Maryland suggests a yellowish underside where the fruit touches the ground, and a dead tendril near the stem.
Harvest on time. UC ANR warns that “Leaving the fruit on the plant too long may result in split melons or fruit decay”. Maryland Extension adds that “All melons will rot if left on the ground too long”. UC ANR advises twisting the fruit off rather than cutting it, and says to be careful not to damage the fruit or stems.
Store and serve
Storage is short. UC ANR says “Melons may be stored for a few weeks under refrigeration”, but it adds that if stored too long, “they may lose color and crispness”. Maryland Extension gives a range of 5 to 18 days in cool, moist conditions, and says muskmelon keeps ripening after harvest, unlike watermelon.
Cut melon needs cold care. Maryland Extension says to “Refrigerate and cover once a melon is cut”. Clemson says that at full slip, a cantaloupe’s quality “will deteriorate” if it is not consumed or cooled soon.
Pests and problems
Clemson says insect problems are “usually critical only in the seedling or early growth stage”, and names cucumber beetles and aphids as the most noticeable pests. Its page also lists gummy stem blight, Alternaria leaf blight, downy mildew and nematodes as problems that can affect melons. Maryland Extension says a thick organic mulch “will limit weed growth and help protect fruits from rot diseases”.
This guide does not give steps for controlling pests or plant diseases. For control that fits your area, ask your county extension office.
How we chose
We opened four university and extension pages on 2026-10-23: one each from Clemson and Maryland extension services, one from the UC Agriculture and Natural Resources integrated pest management site, and one from Iowa State University Extension. We kept the pages that describe planting, spacing, watering, harvest and storage in plain words. Each page had to load with a 200 status, and each figure in this guide had to match the page text.
We set aside general gardening sites and commercial pages that came up in search, because they are not extension or university pages. Where two pages gave different numbers, such as sun hours and harvest signs, the text shows both.
What we could not verify
The pages do not give a planting date for your area. Clemson uses soil temperature, Maryland uses the last frost, and Iowa State University gives central Iowa examples. Use your local frost dates, then count the days to harvest from the date you plant or transplant.
What the sources do not say
The pages do not describe growing melons in containers, so the spacing above assumes a garden bed or a larger patch. They give different days-to-harvest references: Maryland Extension counts 80 to 100 days from transplanting, while Clemson counts 30 to 35 days from pollination for most cantaloupe varieties. They also do not agree on sun hours or harvest signs. The Clemson page covers cantaloupe and honeydew only, so watermelon advice comes from Maryland and Iowa State University.
Frequently asked questions
Can melons be grown in a small garden?
Yes, with a compact plan. UC ANR says “Cantaloupe is suitable for a small garden if compact varieties are grown”. Iowa State University Extension recommends bush-type varieties when space is limited, and Maryland Extension notes that trellising can allow closer spacing.
Why are melons small or split?
Water is the most likely cause in these sources. UC ANR says “If plants are stressed for water when they start to set fruit, the melons may be small or deformed and rot will increase”. Maryland Extension links split fruit to watering near ripeness, and says to stop watering when the fruit begins to ripen.
How can you tell when a melon is ripe?
It depends on the type. For muskmelons, look for full slip, when the stem separates from the fruit. For honeydew, look for a soft blossom end that turns yellow. For watermelon, look for a yellowish underside and a dead tendril at the stem.
Why do melon vines set little fruit?
Two causes come up most often. Clemson names a lack of bee pollination as one of the most common causes, and it also says too much nitrogen or planting too close can give lots of vine and very little fruit.
Can a cut melon be kept in the refrigerator?
Yes, and cover it well. Once a melon is cut, the Maryland guidance is to chill it right away and keep it covered in the refrigerator.
Bottom line
Plant when the soil is warm, give the vines full sun and room, water deeply, and pick by the sign for your type. Those four steps are the common thread across the pages.
Sources
- https://hgic.clemson.edu/factsheet/cantaloupe/ (opened 2026-10-23)
- https://ipm.ucanr.edu/home-and-landscape/cantaloupe/cultural-tips/index.html (opened 2026-10-23)
- https://yardandgarden.extension.iastate.edu/faq/what-proper-way-plant-muskmelon-and-watermelon-home-garden (opened 2026-10-23)
- https://www.extension.umd.edu/resource/growing-melons-home-garden (opened 2026-10-23)
