Want to grow a quirky, weird little fruit in your garden that resembles tiny watermelons?
Enter the cucamelon. Also called mouse melons or Mexican sour gherkins.
Besides the novelty of cucamelon, these guys are delicious summertime snacks that can be eaten off the vine!
They have a slight zest of sourness but can be used in soups or salads if you wanna try something new and exciting.
If you’ve never grown fruiting vine plants before, this is good for beginners. It looks exotic and cute, and it’s edible!
Once you get them going, they take care of themselves. Give some TLC and you’re good.
Let’s dive in and learn how to grow and care for sour gherkins!
Guide Contents
Quick care guide: Cucamelons
| Plant type | Perennial herb (zones 10 or higher), annual (cooler zones) |
| Origin | Central America, South America, Mexico |
| Scientific name | Melothria scabra |
| Other names | Mexican sour cucumber, Mexican miniature watermelon, Mexican sour gherkin, mouse melon, sandita, pepquinos, little watermelon, Guadelooupe cucumber, creeping cucumber, Mexican cucumber |
| Soil type | Fertile, loamy, well-draining, nutrient-dense |
| Soil pH | 6.0-6.8 (slightly acidic) |
| Sunlight requirement | Full sun, at least 6 hours per day |
| Bloom season | Spring, summer |
| Colors | Green, lime green, yellow |
| Max height | 10 feet |
| Max width | 10 feet (if not grown vertically) |
| Low temperature tolerance | 50F |
| High temperature tolerance | 90F |
| Ideal temperature range | 65F-75F |
| Humidity | Moderate (50% or higher) |
| Watering requirements | 1-2 inches of water per week |
| Fertilizer requirements | Moderate, use adjusted dosage in spring/summer, supplement with high potassium, low nitrogen plant food |
| Plant food NPK | 5-10-10 |
| Days until germination | 7-14 days |
| Days until harvest | 60-80 days |
| Bloom time | 80-100 days |
| Speed of growth | Moderate |
| Hardiness zones | Annual: 2, 3, 4, 5, 6, 7 Perennial: 8, 9, 10, 11, 12 |
| Plant depth | 0.25-0.50 inches for seeds, plant same depth as original container if from seedling |
| Plant spacing | Groups of up to 5 plants 1-2 inches apart. Space groups at least 12 inches apart. |
| Plant with | Cucumbers Cantaloupe Honeydew Dill Peas Beans Onions Radish Parsnip Carrot Corn Tomatoes Lettuce Kohlrabi Asparagus Celery |
| Don't plant with | Sage, potato |
| Propagation method | From seed or seedlings |
| Common pests | Snails, slugs, aphids |
| Common diseases | Cucumber mosaic virus, powdery mildew |
| Indoor plant | No |
| Outdoor plant | Yes |
| Grown in container | Yes |
| Flowering plant | Yes |
| Beginner friendly | Yes |
| Care level | Low (very easy for beginners) |
| Best uses | Soups, salads, seafood, sauces, pickling, canning |
Toxicity warning
There are multiple types of these melons that have a similar appearance, which can make it extremely easy to get them confused.
For starters, you have the edible species, Melothria scabra.
But then you have other types like M. charatia or M. pendula, which will become toxic over time. They turn black over time which signifies that they’re not edible. M. scabra is edible anytime. The other two are only edible before they turn dark.
To be safe, you should always confirm the species and then act accordingly. If you’re new to growing cucamelons, stick with the M. scabra cultivar.
Last updated: 6/23/22.
What’s cucamelon? Or mouse melon? Or sour gherkin?
Cucamelons, also known as mouse melons or sour gherkins are a unique little fruit that originates from Central and South America.
They’re not a cucumber nor a melon. But they’re considered to be part of the Cucurbitaceae family, which is the “larger cucumbers.” AKA Curcubits.
They’re known to be stubborn with low yields, making them hard to grow in the home garden or require a lot of effort.
This makes gardeners less inclined to grow them compared to other easy-to-grow fruit bearers like San Marzano tomatoes or sugar beets. Most people grow cucamelons for the novelty- they literally look like tiny watermelons.
If you’re up for the challenge, growing your own cucamelons is an exciting endeavor that’ll earn you bragging rights.
These fruits are usually consumed on the spot and rarely even make it into the kitchen. Yes, they’re tastiest when they’re eaten right off the vine!
While similar to cucumbers, they’re more like watermelons. They taste like cucumber with a slight tang of citrus. They’re not hard to grow, but they do have some quirks that you’ll want to be aware of so you can get the most flavor possible.
The leaves of cucamelon are exactly like cucumber leaves. The vines are coated with fine hairs that give them a fuzzy look. They have creeping vines that climb and stick to whatever is nearby.
What do they taste like?
Cucamleon is a flavor between cucumbers with some soreness. Think cucumber with a touch of lime.
While they’re not that sweet where you can down them like watermelon, they can be used to add some zest to your favorite drinks.
Growing cucamelon in garden beds is ideal, but you can also grow them in containers. I think most people just grow them for their novelty rather than eating them!
You may find them in the local farmer’s market, but rarely beyond that. They’re not sold in groceries because the demand for them is low.
Even if you do find them somewhere, they’re not cheap. You may see them upwards of $25 per pound.
So if you want to grow them for profit, or just because you like them, you’ll be happy to know that cucamelons are easy to grow and productive. Just be patient. Impatient gardeners will have a tough time because of their slow start.
But once you get them going, they’re extremely productive when the temperatures warm up.
What does cucamelon look like?
Cucamelon fruits look like tiny watermelons, but they’re actually classified as berries.
They’re about 1 inch in size but can get a bit bigger depending on how they’re grown. The skin is striped with dark green and light green patterns, just like watermelon.
The berries have small seeds on the inside with white flesh. The seeds can be harvested for regrowing next season. The seeds are easy to scoop out when eating. They’re coated with a gel.
As for the vine, they grow up to 10 feet tall and are climbing vines. The vines are thin, leggy, and dark green. The flowers are yellow with 5 petals and a darkened center.
Are Mexican sour gherkins easy to grow?
Generally, yes. They’re slow to start, but once they become established, they don’t require much care.
They’re also resilient to pests, hot and cold weather, and even drought-tolerant.
This makes them an easy vine plant to grow for beginners and why you should grow cucamelon in your edible garden.
How to propagate cucamelon
Propagating cucamelons is simple. You can do it from seed or buy a pre-grown seedling at your local nursery.
Either way is fine, but starting from seed is definitely more common as people usually collect them to replant next season if not in the right zone.
It doesn’t make much sense for garden centers to sell cucamelon seedling plants either as most people can’t grow them right. Cucamelon is resistant to drought once established.
From seed
The right time to plant cucamelon seeds is in the spring.
You want to make sure that there will be no more temperature dips and the climate is stable. Start seeds outdoors. There’s no need to start them using a starter kit indoors.
But there are some things you need to do to prep the soil before you sow the seeds:
First, use your favorite hand spade and roughen up the soil. Loosen it up so that it’s soft. Remove clumps of hardened parts. If it’s extra tough, water it first to help break it down. Use a rake if necessary to save your back.
If your zone is too cold to start outside, you can sow indoors using a starter tray with a humidity dome. Start seeds indoors about 6-8 weeks before the last spring frost. Sow them into individual pots or use a seed starter kit.
Sow 2-3 seeds per compartment using good quality soil made for potted plants. Use the same soil that you plan to use later in the garden to minimize shock.
Place it somewhere warm with sunlight.
Water to keep it moist, but not wet. When the roots grow out, harden them off and put them outside.
The roots need to be visible before you transplant cucamelons.
If not, you’ll need to keep it incubating, or else the climate change can cause plant shock. On average, cucamelons can be put into the garden about 8 weeks later or so.
Use well-draining, fertile soil. It should be rich and full of nutrients. If it’s made for fruits, it should be fortified with the necessary nutrients to help your cucamelon maximize yield.
Get organic soil if possible or if you plan on going organic.
Mound the soil by putting small bunches of soil in small batches.
If you’re not sure how to mound, reference this video:
Space each mound 3 feet (36 inches) apart. Put 1-2 seeds per mound. Plant 0.5” deep. Insert the pointed end of the seed into the soil. Lightly cover the seeds with some soil.
No need to firm it. It should sit comfortably.
Water generously to establish water pathways. You’re done! Wasn’t that easy?
Next, check the weather for the next few weeks. If you expect dips in the temperature, cover your seeds with a dome cover.
You’ll want to check daily to keep tabs on it. If it’s not going to be cold, no dome is needed. But if so, domes can help save your poor roots from dips.
These can be found in your local home improvement store or online!
They can help insulate the temperature, but don’t keep it on if it’s going to be warm.
They will trap heat and will wilt your seedlings if you use them on a hot day. This is just burning your plants.
Only use if the temperatures drop below 50F. Otherwise, you can let them grow as is.
Continue checking for pests, fungus, or other issues. Water every other day to keep it moist, but not waterlogged. This will kill your seedlings.
Cucamelon will germinate within 1-2 weeks, depending on local temperatures. Warmer conditions will encourage generation.
From seedlings
If you happen to find cucamelon on sale, just get a new container with at least the same depth and width as the original pot.
Gently remove the original plant from the soil by loosening it. It may need some water to help loosen it up. Pop it into the new container.
Cover it with soil just like before. The base of the plant needs to be covered with soil, but don’t cover the leaves. Water it generously. Monitor for pests or infections.
The vines of cucamelon are fragile-looking, but they’re actually pretty resilient. Don’t be scared to prune it back or be a bit rough on it.
The vines are expert climbers, so provide some kind of support for them to cling to. You may need to guide the vines a few times until they establish themselves.
How to grow cucamelon
This section covers general guidelines for cucamelon care.
Your cucamleon’s care needs will vary depending on the cultivar, ambient conditions, and your hardiness zone.
So don’t take it literally.
Use it as a general care sheet so you know what’s required to grow and care for cucamelons in the garden.
Hardiness zone
Cucamleon needs warmer temperatures to yield those gorgeous berries, so that’s why you only find it growing on the margins of fertile, temperate zones.
It grows in USDA hardiness zones 2-11. But once you get into cooler zones, the temp dips likely will halt production.
This is especially true for those lower zones or northern zones. If this is you, you’ll need to overwinter the cucamelon in order to protect it.
Soil
Natively, cucamelons prefer soil that’s rich, fertile, loamy, and wet. They grow in the heavily forested regions with their lengthy vines.
Cucamelons have also been spotted in the margins of sandy soil regions
Consider mixing one part compost or perlite to help inject nutrients into the soil so it gets what it needs to produce plus help with water-saving.
pH value
The soil pH for cucamelon should be acidic between pH values of 6-6.8. You can lower the pH naturally using limestone or natural leaf litter.
Spacing
Cucamelon should be planted in small groups of 5 plants.
Provide 1-2 inches between each plant. Each group should be 12 inches apart, at least. This will optimize your garden space so you can maximize productivity.
Staking
Cucumaleno vines can reach up to 12 feet at max length.
You’ll need plenty of room for them to grow if you want to maximize yield. The vines can climb upwards or outwards, so you can use traditional methods like fencing, trellises, or stakes.
When they bear fruit, they get heavy so that’s why you need to provide something for them to climb on. Plant support is highly recommended.
The vines should be guided onto the trellis or support and then weaved through. Don’t let them touch the soil as it provides a bridge for pests to climb onto it.
Consider using sturdy trellises to keep it off the soil level and make harvesting easier.
Cucamelon that’s not being trellised will be prone to insects or pathogens since they’re touching the soil. It looks extremely ugly too.
Depth
Plant seeds 0.25 to 0.50 inches deep. Plant seedlings as deep as the crown, plus 1 inch so it’s completely covered.
Temperature
Cucamelon will become hardy to both cold and heat, but only when fully established.
They’re vulnerable when younger, so you should ensure that there are no temperature swings before planting outside in your garden bed. Be careful. Watch the weather.
The temperature should be between 60-75F for ideal produce. Cucamleon will wither if temperatures drop below 50F.
Temperatures that are too hot, such as above 90F, may cause production to stop.
Plant food (fertilizer)
Fertilizer is recommended for maximum yield.
The vines will benefit from 3 inches of organic compost in the spring and then again in summer.
If you use plant food, get one that’s made for fruits or citrus. Look for NPK values of 5-10-10 or higher potassium over nitrogen. No fancy NPK ratios are needed.
For soil that’s depleted, use a dose of fertilizer as directed. Don’t overdose or use half dosages to prevent plant food buildup.
If you’re growing in pots, you’ll need to half your dosages at first to see how your plant reacts.
Fertilizer is necessary if your plants are growing very few fruits or you have too leggy plants. Reduce the nitrogen in your fertilizer (the “N” in the NPK rating) to foster production.
Use a fertilizer with high potassium for max yield
Humidity
Cucamleon prefers moderate to high humidity.
This is a humidity level of at least 50%. Humidity won’t make or break your fruit, so don’t worry about it too much.
Warm humid climates will approximate their native environment in Central America. If you can provide this, you can optimize their production
Pruning
Cucamelon doesn’t require regular pruning unless the foliage is damaged or infested with bugs.
Prune off yellowing, browning, or wilting leaves.
Vines or stems that are damaged should be removed rather than letting the plant waste energy. Fruits that have been eaten or infested by pests should be pruned.
Watering
Plants will need about 1-2 inches of