Black Diamond

Family: Cucurbitaceae Vegetable

Sink your teeth into Black Diamond’s richly perfumed sweetness—an inky, dark rind that feels substantial in the hand and gives way to a vivid, crisp interior.

The flesh is exceptionally firm and juicy, with a smooth, fine-grained bite that stays satisfying from first slice to the last spoonful of summer. Ideal for picnic-style enjoyment, Black Diamond shines as a showy centerpiece for fresh sharing and as a standout choice for refreshing fruit salads and bright, fruit-forward salsas.

Light: Full SunMaturity: 85 DaysHabit: Vine

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

Crop Dates

Milestone	Date
Start Indoors	Apr 25th
Last Frost	Apr 25th
Transplant / Sow Outdoors	May 9th
Harvest Begins	Aug 2nd
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)	70
Min Soil Temp (°F)	65
Min Night Temp (°F)	55
Harden Off (days)	10

Culinary Notes

Chef's Note

Black Diamond’s firm, fine-grained flesh is built for cold, fresh applications where texture matters—the bite stays crisp instead of turning watery or mealy. Pair it with bright acidity (lime) and cooling herbs (mint) or salty dairy (feta/yogurt) to sharpen the sweetness and make each mouthful feel cold and electric.

Best Uses

picnic centerpiece wedges that hold their structure (no mushy slump)
fruit salad where the flesh stays snappy under light dressing
bright, fruit-forward salsa for scoops—keeps a crisp texture against heat
cold granita-style spooning for maximum juice yield

Flavor Profile

rich, perfumed sweetness exceptionally firm, glassy-juicy bite clean, crisp finish with smooth grain inky rind that signals a pronounced melon aroma

Kitchen Pairings

lime mint feta chili powder cucumber improved sour cream or Greek yogurt

Frequently Asked Questions

Why are my Black Diamond plants suddenly wilting and developing fuzzy gray mold on leaves or fruit, and how do I fix it?

Fuzzy gray mold (Botrytis) on Black Diamond is usually triggered by cool, humid weather and crowded airflow. Remove any gray-moldy leaves or fruit immediately, water only at the soil line, and thin/spread plants so air can circulate through the canopy. If it’s spreading, start a labeled fungicide for edible eggplants/solanums according to the product’s directions and repeat as instructed.

How often should I water Black Diamond during the main growing phase, and what soil moisture should I maintain?

During vegetative growth through fruit set, keep the soil evenly moist but not soggy—aim for about 1 to 1.5 inches of water per week depending on heat and your soil, split into 1–2 deep waterings. Check 2–3 inches down: if it’s dry at that depth, water; if it stays damp, hold off. Consistent moisture helps prevent blossom drop and keeps fruits from developing tough, irregular texture.

How can I tell when Black Diamond is ready to harvest?

Harvest when the fruit is glossy deep black and about 7–9 inches long with a firm, slightly springy feel—typically around 80–85 days after sowing, depending on conditions. If the skin looks dull or the fruit feels hard and the seeds look prominent when cut, it’s likely past peak. Use clippers to cut the stem with a short piece attached to avoid tearing the plant.