🍉 Citrullus lanatus Watermelon ‘Charleston Gray’ – Large, Sweet, Classic American Heirloom with Firm, Red Flesh

‘Charleston Gray’ is a famous heirloom watermelon known for its elongated, light-green rind, deep red juicy flesh, and exceptional sweetness. Highly productive and vigorous, this variety produces large fruits, typically weighing 10–14 kg (22–30 lb). The rind is thick and crack-resistant, making it excellent for transport and long storage. Perfect for fresh eating, fruit salads, juices, and summer desserts. A dependable performer in warm, sunny gardens.

Key Features

● Large, elongated melons with light green rind

● Sweet, crisp, deep red flesh

● Fruits reach 10–14 kg (22–30 lb)

● Crack-resistant rind with good keeping quality

● Vigorous, high-yielding heirloom variety

How to Sow & Grow Watermelon ‘Charleston Gray’ (UK)

Sow indoors: IV–V (April–May) in pots

Transplant outdoors: V–VI (May–June) once nights stay above 12 °C (54 °F) and frost danger has passed

Direct outdoors: V–VI (May–June) in warm climates or under cloches

Harvest: VIII–IX (August–September)

Germination temperature: 24–30 °C (75–86 °F)

Average germ time: 7–14 days

Depth: 1–2 cm (½–¾ in)

Light required: Yes

Environment: Full sun

Moisture: Keep evenly moist, avoid waterlogging

Environment: Full sun, warm sheltered site or greenhouse/polytunnel

Soil type: Rich, fertile, well-drained soil; add compost before planting

Plant spacing: 1–1.5 m (3–5 ft)

Vine length: 2–3 m (6.5–10 ft)

Sowing & Growing Tips (variety-specific)

● Start indoors for best results in the UK climate.

● Train vines or provide ample ground space.

● Water consistently until fruits set, then reduce watering for sweeter melons.

● Harvest when the tendril nearest the fruit dries and the rind dulls.

● Warm microclimates or tunnels significantly improve yields.

Special Features

● Excellent storage and transport quality due to thick rind

● Classic American heirloom with outstanding sweetness

● Large, impressive fruits ideal for summer gatherings