Fruit · Vine & Melon
Watermelon
Citrullus lanatus
A sprawling warm-season vine that needs plenty of room, heat, and consistent water to produce sweet, juicy fruit. A poor fit for small containers, but rewarding where space allows.
At a glance
Water
High
48–68 fl oz/wk
Light
Full sun
8–10 hrs/day
Space
Large
60 in
To maturity
70–90 days
Edible parts: Fruit
Family: Gourd
Includes watermelon, cucumber, squash, and melons. Sprawling vines with large leaves and separate male and female flowers on the same plant.
Harvest
Ready when the tendril nearest the fruit has dried and browned and the underside spot has turned from white to a creamy yellow.
Growing conditions
- Temperature
- 65–95 °F
- Soil pH
- 6–6.8
- Soil type
- Nutrient-rich, well-drained sandy loam
- Climate
- Warm-season, heat-loving; needs a long, hot stretch to ripen fully.
- Growing season
- Direct-sow or transplant after the last frost once soil is reliably above 65°F.
- Nitrogen
- Medium (≈40–80 ppm)
- Humidity
- Medium (≈40–70 %)
- Planting unit
- Seed
- Feeding schedule
- Balanced feeding during vine growth, shifting to lower-nitrogen once flowering starts to favour fruit set over more vine.
- Pest resistance
- Moderate - watch for cucumber beetles and aphids, and for blossom end rot in calcium-poor soil
- Pests
- Aphids: Small, soft-bodied insects that cluster on new growth and undersides of leaves, sucking sap and excreting sticky honeydew., Cucumber beetles: Small yellow-and-black striped or spotted beetles that chew leaves, flowers, and fruit rind of vine crops, and can spread bacterial wilt.
- Pruning
- None required; pinching vine tips can encourage branching in a limited space.
Where it grows
- In-Ground GardenIdeal— Needs 20+ sq ft per plant to sprawl.
- Container / PotPossible— Needs a very large container (15-20 gallon) and a compact bush variety.
- Raised BedPossible— Vines will spill well beyond the bed unless trellised or a bush type is used.
- HydroponicNot recommended— Vine size and fruit weight are impractical for most home hydroponic setups.
- Vertical / TrellisNot recommended— Fruit is generally too heavy for a home trellis without slings.
- WindowsillNot recommended— Needs far more light and space than a windowsill offers.
Companions & antagonists
No known companion pairings yet.
Sources
- How to Grow Watermelon From Seed — Johnny's Selected Seeds
- Watermelon — Oregon State University, Department of Horticulture