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Watermelon 'Blacktail Mountain'

Citrullus lanatus 'Blacktail Mountain'

Watermelon (Eng.), Waatlemoen (Afr.)


Blacktail Mountain has orange-red flesh and a dark, almost black, skin. This variety is a consistently high producer and it's unique rind color makes it an interesting addition to any garden. Watermelon is a spreading trailing plant that produces large round to oblong fruits with a mottled or striped green skin. Watermelon flesh can be red, orange, yellow or white depending on the variety. Watermelon is grown in tropical and subtropical areas worldwide for its large edible fruit, which is a special kind of berry with a hard rind and no internal division, botanically called a pepo. The sweet, juicy flesh is usually deep red to pink, with many black seeds, although seedless varieties have been cultivated. Watermelons are tender and need a long warm growing season to produce its fruit. Watermelon fruit is 91% water, contains 6% sugars, and is low in fat. In a 100 gram serving, watermelon fruit supplies 30 calories and low amounts of essential nutrients, only vitamin C is present in appreciable content at 10% of the Daily Value.


Flowering time
Summer, Spring
Fruiting time
Summer, Autumn


Fruits are picked when they are fully ripe. Rolling the melon over and looking at the ground spot where the melon was laying is probably the best method to determine if the melon is ripe. If that portion of the watermelon is a pale yellow color, the melon should be ripe. You can also look at the tendrils (short, curly, stem-like vine) next to the melon. The tendrils are close to the area where a leaf is attached to the main vine. When the first tendril next to the fruit looks dead and dried up, the melon closest to that tendril should be ripe. Watermelons will store longer than other melons and should be refrigerated, especially after cut. This variety takes 65-75 days to mature.


Sow seeds directly or start indoors 4 weeks before transplanting if possibility of frost is possible. Plant in groups of 3 and 30-45 cm apart and 1-2.5 cm deep. Germination takes 4-10 days.

Special features

Drought resistant
This variety tolerates heat and drought very well.
Crop rotation
Black Mountain Watermelon is a heavy feeder and needs a lot of nutrients. To reduce insect and disease problems, avoid planting cucumber family crops (melons, squash, pumpkins) in the same spot two years in a row.


USA, Iowa
Natural climate
Sub-tropical, Tropical, Temperate


Full Sun
Soil moisture
Soil type
Loam, Sand
Soil PH preference
Neutral, Acid
Frost hardiness


The fruits are edible and best eaten fresh. A wonderful thirst quencher on a hot summers day or added to salads, deserts and even made into jams. The rind is edible after cooking.


Flower colour


Major pests of the watermelon include aphids, fruit flies and root-knot nematodes. In conditions of high humidity, the plants are prone to plant diseases such as powdery mildew and mosaic virus. Some varieties often grown in Japan and other parts of the Far East are susceptible to fusarium wilt. Grafting such varieties onto disease-resistant rootstocks offers protection.

Companion plants

Growing maize between your rows of watermelons will help protect the leaves from wind damage and help keep moisture levels.

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