Jubilee Improved

Family: Cucurbitaceae Vegetable

Sink your spoon into Jubilee Improved’s richly sweet, sunset-red flesh—juicy, fragrant, and famously crisp for a picnic watermelon.

The rind is bold and handsome, with dark green striping over a sturdy, well-balanced shape that slices cleanly into shareable wedges. Grow Jubilee Improved for backyard gatherings, summer fresh eating, and show-stopping fruit-forward salads and chilled drinks that celebrate its peak flavor at maturity.

Light: Full SunMaturity: 85 DaysHabit: Vine

Botanical illustration of Jubilee Improved

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Apr 11th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jul 19th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	85
Sun Requirements	Full Sun
Growth Habit	Vine
Support Needed	Trellis
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	65
Min Night Temp (°F)	55
Harden Off (days)	12

Culinary Notes

Chef's Note

Jubilee Improved is built for spoonable, cold eating—its crisp, high-juiciness holds shape long enough for salads and stays refreshing in a blender. When you balance that aggressive sweetness with lime, salt, and herbs, it tastes like summer in technicolor rather than plain fruit candy.

Best Uses

ice-cold picnic wedges that hold crunch instead of turning mushy
fruit-forward salad: cubed watermelon with salty crumbles and quick herbs
blended chilled drinks/sherbets where a crisp fruit gives better texture
light grilling or broiling for caramelized edges—best for thicker slices

Flavor Profile

intensely sweet, candy-like flesh high-aroma, clean “watermelon perfume” finish snappy-crisp bite with very juicy pull bright, cooling acidity that keeps it from tasting flat

Kitchen Pairings

lime juice feta cheese fresh mint kosher salt cucumber tequila

Frequently Asked Questions

What’s a common watermelon (Citrullus lanatus) problem, and how do I treat it?

A frequent issue is powdery mildew, which shows up as a gray-white coating on older leaves and can reduce fruit size by weakening the plant. At the first sign, improve airflow (thin any overcrowded vines) and water at the base so foliage stays dry. If needed, spray a labeled sulfur product and reapply according to the label interval, especially during humid weather.

How often should I water watermelon during the main growing phase?

During active vine growth and while fruits are swelling, keep soil consistently moist but not soggy—about 1 to 2 inches of water per week, adjusted for heat and rainfall. Water deeply 1–2 times per week rather than lightly every day, and aim for the root zone (not the leaves). About 7–10 days before harvest, reduce watering to limit watery fruit.

How can I tell when Jubilee Improved watermelon is ready to harvest?

Harvest when the ground spot (where it rests on the soil) turns from pale/green to creamy yellow, and the fruit’s skin looks dull rather than shiny. The tendril closest to the fruit should turn brown and dry, and the fruit should sound deep when tapped. Use these cues together—don’t rely on days to maturity alone.