How to Grow Charleston Gray Watermelon
Citrullus lanatus 'Charleston Gray'
Charleston Gray Watermelon is a beloved heirloom variety known for its deep green rind and sweet, orange flesh. Gardeners prize this melon for its excellent disease resistance against fusarium wilt and anthracnose, making it a reliable choice for home gardens across warm regions.
📷 Wikimedia CommonsStarting Charleston Gray Watermelon: indoors or direct sow?
🌾 Sow directly in the garden — Charleston Gray Watermelon is not usually started indoors.
Do not start indoors or transplant; sow seeds directly into the garden only after all danger of frost has passed and soil temperatures have warmed sufficiently.
Soil, care & harvest
Prepare loose, well-draining soil with a pH between 6.0 and 7.0. As a warm-season crop, you must wait until after the last spring frost when the ground is thoroughly warm to plant directly outdoors. Sow seeds at a depth of about one inch; they typically germinate within seven to ten days under these ideal conditions.
Space plants 72 to 96 inches apart to allow vines ample room to spread and produce fruit. While watermelons are not usually trellised, you can train them on a low support if desired. Provide one to two inches of water weekly using deep watering methods, and apply mulch heavily around the base to retain moisture and keep fruits clean.
Watch for cucumber beetles, aphids, squash bugs, and flea beetles; control them with row covers or organic sprays. Prevent fungal issues like powdery mildew by ensuring good airflow. Harvest your melons approximately eighty-five to ninety days after planting when the rind becomes dull and slips easily from the vine.
When to Plant Charleston Gray Watermelon
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | June | July – September | October – August |
| Zone 2 | May – June | July – August | October – September |
| Zone 3 | May | June – August | September – October |
| Zone 4 | April – May | June – July | September – October |
| Zone 5 | April | May – July | September – October |
| Zone 6 | April | May – July | August – October |
| Zone 7 | March – April | May – June | August – September |
| Zone 8 | March | April – June | July – September |
| Zone 9 | February | March – May | June – August |
| Zone 10 | January – February | March – April | June – July |
| Zone 11 | January | February – March | May – June |
| Zone 12 | January | February – March | May – June |
| Zone 13 | January | February – March | May – June |
Companion Plants for Charleston Gray Watermelon
✓ Good companions
Fix nitrogen in soil, provide natural ground cover without competing
Repels ants, aphids, and cucumber beetles more effectively than DEET
Provides natural windbreak and partial shade for vines
Repel nematodes and cucumber beetles, attract beneficial insects
Trap crop for cucumber beetles and squash bugs, repels aphids
Repels cucumber beetles and provides ground cover
Repel cucumber beetles and squash vine borers, improve soil structure
Attract pollinators and beneficial insects, provide vertical structure
✗ Keep away from
Produces juglone toxin that inhibits growth and can kill melon plants
Releases allelopathic compounds that stunt growth of nearby plants
Compete for nutrients and space, may harbor similar pests like cucumber beetles
Nutrition Facts
Per 100g serving (USDA FoodData Central)
