70-75days to harvest
5-10days to germinate
Z3–8USDA zones
Easydifficulty
Heirloom

Sowing

Direct sow when soil reaches 65°F or start indoors 2-3 weeks before last frost. Plant seeds 1 inch deep.

Cultivation

Sun
Full sun (6+ hours)
Water
1-2 inches per week, reduce as fruit ripens
Soil
Well-drained sandy loam, tolerates various soil types
Soil pH
6.0-7.5
Spacing
36-48 inches
Height
4-8 inches
Season
Warm season

Appearance & flavour

Colour
Dark green skin with red flesh and black seeds
Size
8-10 inches long, 6-12 pounds
Shape
Oval to round
Flavour
Sweet and juicy with excellent watermelon flavor

In the kitchen

Fresh eating, fruit salads, juice, preserves

Pests, disease & resistance

Pests
Cucumber beetles, aphids, squash vine borers
Diseases
Anthracnose, fusarium wilt, bacterial fruit blotch
Resistance
Good cold tolerance, moderate disease resistance

Planting calendar by USDA zone

ZoneStart indoorsTransplantDirect sowHarvest
2May – JuneJulyJuly – AugustSeptember
3MayJune – JulyJune – AugustSeptember – October
4April – MayJuneJune – JulySeptember – October
5AprilMay – JuneMay – JulyAugust – October
6AprilMay – JuneMay – JulyAugust – September
7March – AprilMayMay – JuneJuly – September
8MarchApril – MayApril – JuneJuly – August
9FebruaryMarch – AprilMarch – MayJune – July
10January – FebruaryMarchMarch – AprilMay – July
11JanuaryFebruaryFebruary – MarchApril – June
12JanuaryFebruaryFebruary – MarchApril – June
13JanuaryFebruaryFebruary – MarchApril – June

Companion planting

8 beneficial pairings indexed for this variety, 3 to avoid.

NasturtiumsTrap crop for cucumber beetles and squash bugs, repels aphids
MarigoldsRepel nematodes and cucumber beetles with their strong scent
RadishesDeter cucumber beetles and squash vine borers, mature quickly without competing
BeansFix nitrogen in soil to benefit heavy-feeding watermelons
CatnipRepels ants, aphids, and cucumber beetles more effectively than DEET
OreganoRepels cucumber beetles and provides ground cover to retain soil moisture
CornProvides vertical structure and shade, traditional Three Sisters companion
SunflowersAttract beneficial insects and provide windbreak protection

Avoid

FennelAllelopathic compounds inhibit germination and growth of melons
TomatoesCompete for similar nutrients and space, both susceptible to similar fungal diseases
PotatoesMay stunt melon growth and both crops attract similar harmful insects

Nutrition (per 100 g)

Calories (per 100 g)
30
Protein (g)
0.61
Fat (g)
0.15
Carbohydrate (g)
7.55
Fibre (g)
0.4
Sugars (g)
6.2
Vitamin A (µg)
28
Vitamin C (mg)
8.1
Vitamin E (mg)
0.05
Vitamin K (µg)
0.1
Vitamin B6 (mg)
0.045
Folate (µg)
3
Calcium (mg)
7
Iron (mg)
0.24
Magnesium (mg)
10
Phosphorus (mg)
11
Potassium (mg)
112
Zinc (mg)
0.1
Selenium (µg)
0.4

Where to buy seed and equipment

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Growing it? There is a full cultivation guide at the melons growing guide.

Cultivar facts compiled from public horticultural references including USDA GRIN and NC State Extension. Descriptions are original to this catalogue.

DarkGrow forum

Grown Blacktail Mountain Watermelon?

Post a crop report — day counts, reservoir readings, what worked. Variety-specific logs are the most useful thing on the forum.

Similar varieties

Other melons with a comparable time to harvest, so a season that suits Blacktail Mountain Watermelon suits these too.

Browse all 38 melons