Crimson Sweet

Watermelon

Zone 3b Save Garden

🌱 85d to harvest Vine

Sink your teeth into Crimson Sweet’s richly sweet, bright red flesh—juicy as a summer sunset—with a crisp, fine-grained bite that…

Crop Dates

Milestone	Date
Start Indoors	May 19th
Last Frost	May 19th
Transplant / Sow Outdoors	Jun 2nd
Harvest Begins	Aug 26th
Harvest Ends	Sep 21st

Crop Details

Trait	Value
Days to Maturity	85
Sun Requirements	Full Sun
Growth Habit	Vine
Support Needed	Trellis
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	70
Min Night Temp (°F)	55
Harden Off (days)	12

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Frequently Asked Questions

What’s a common disease problem for Citrullus lanatus (Crimson Sweet watermelon), and how can I prevent or control it?

A frequent issue is powdery mildew, which shows up as a white, dusty coating on older leaves during warm, dry spells. Increase airflow by giving vines room to sprawl, water at the soil line (not on leaves), and remove badly infected leaves early to slow spread. If it’s already widespread, use a labeled fungicide for cucurbits and begin treatments at the first signs, repeating as directed on the label.

How often should I water Crimson Sweet during the main growing phase, and what soil moisture level should I aim for?

During active vine growth and until the fruit starts to size up, keep the soil evenly moist with about 1–1.5 inches (2.5–4 cm) of water per week, adjusting for heat and rainfall. Water deeply so moisture reaches the root zone, but avoid soggy soil—waterlogged conditions can cause root stress and poor fruit development. When fruits are nearly full size, reduce watering to prevent overly watery fruit and cracking.

How do I tell when Crimson Sweet watermelon (Citrullus lanatus) is ready to harvest?

Harvest at about 85 days from sowing (often later depending on temperature), when the rind is fully colored and the fruit sounds hollow when thumped. Look for a creamy yellow ground spot where the melon rests on the soil, and watch the tendril near the stem—when it turns brown and dries, the fruit is typically ready. If it’s not showing these signs, wait a few more days rather than harvesting early.

Sink your teeth into Crimson Sweet’s richly sweet, bright red flesh—juicy as a summer sunset—with a crisp, fine-grained bite that feels cool and clean on the palate. The rind is a classic, eye-catching deep green with bold, field-ready striping, built for dependable performance and satisfying slice-after-slice freshness. Grow this reliable 85-day watermelon for backyard celebrations, standout fruit on the vine, and bold flavor that shines whether served chilled or showcased whole at the table.

Sowing Tips

Transplant Conditions

Wait until soil reaches 70°F and nights stay above 55°F before moving outdoors. Harden off for 12 days first.

Direct Sow Preferred

Sensitive roots — does not transplant well. If starting indoors, use biodegradable pots and disturb roots as little as possible when moving outdoors.

Expert Note

For best Crimson Sweet flavor, wait to transplant until soil is warm (about 70°F) and keep vines on a consistent watering schedule until the last couple weeks before harvest.