SproutSmart
SproutSmart Intelligent Garden Sowing

Black Ball · Cornflower

Zone 5b Save Garden

Planting Schedule

Add Black Ball to your garden to build a schedule and get reminders.
MilestoneDate
Start IndoorsDirect Sow
Last FrostMay 4th
Transplant / Direct Sow OutdoorsMay 4th
Harvest BeginsJul 13th
Harvest EndsOct 5th

Crop Details

Transplant Conditions: Wait until soil reaches 50°F and nights stay above 35°F before moving outdoors.
TraitValue
Days to Maturity70
Sun RequirementsFull Sun
Growth HabitUpright
Support NeededNone
Planting DepthSurface
Germination Temp (°F)60
Min Soil Temp (°F)50
Min Night Temp (°F)35
Harden Off (days)Not Required
Expert Note: For the best deep-purple blooms, sow in full sun and avoid transplanting—direct sow keeps roots intact and improves establishment.