Ruby Sky

Family: Asteraceae Leafy Green

Ruby Sky unfolds in a lush, loose-leaf rosette where tender leaves blush from cool green to vivid ruby-red at the edges, like dawn light on velvet.

Expect a crisp, juicy bite with a mild, refreshing flavor that stays pleasantly sweet—ideal for gardeners who love greens that look as good as they taste. Grow Ruby Sky for abundant harvests over a long season, perfect for fresh salads, bright wraps, and vibrant garnishes that lend color to every bowl.

Light: Part SunMaturity: 50 DaysHabit: Rosette

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

Crop Dates

Milestone	Date
Start Indoors	Mar 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	Jun 7th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	50
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	65
Min Soil Temp (°F)	40
Min Night Temp (°F)	32
Harden Off (days)	6

Culinary Notes

Chef's Note

Ruby Sky’s loose-leaf structure makes it stay snappy and watery, not stringy, so it performs best raw—especially under a citrusy, not-too-thick dressing. The ruby edges bring visual pop, making it an easy choice when you want greens that look alive and bite back.

Best Uses

fresh salads where it can hold crunch
color-forward wraps that don’t need heavy dressing
tossed with citrus vinaigrette to keep it bright
garnish for sandwiches and grain bowls

Flavor Profile

crisp, juicy snap mildly sweet finish cool, refreshing green-note

Kitchen Pairings

lemon olive oil goat cheese cherry tomatoes balsamic vinegar

Frequently Asked Questions

What pest or disease most commonly affects Lactuca sativa (lettuce) and how can I manage it?

Lettuce is commonly hit by aphids and mildew, especially when plants stay damp. For aphids, spray plants with a strong jet of water and spot-treat heavily infested heads/leaves; for mildew, improve airflow by thinning to proper spacing and water at soil level instead of overhead.

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

During the main growth period (roughly weeks 2–6), keep the soil consistently evenly moist—about 1–1.5 inches (2.5–3.8 cm) of water per week in total, adjusted for rainfall and heat. Let the top 1 inch (2.5 cm) dry slightly between waterings, but don’t let the root zone dry out, since lettuce quickly turns bitter when it stresses.

How do I tell when Lactuca sativa is ready to harvest?

Harvest Ruby Sky about 50 days from sowing when heads are fully formed and feel firm to the touch, with leaves that are crisp rather than limp. Cut at the base in the morning for best texture, and if your plants start to stretch upward or flower (bolting), harvest immediately because quality drops fast.