SproutSmart
SproutSmart Intelligent Garden Sowing

Blue Boy · Cornflower

Zone 4b Save Garden

Planting Schedule

Add Blue Boy to your garden to build a schedule and get reminders.
MilestoneDate
Start IndoorsDirect Sow
Last FrostMay 13th
Transplant / Direct Sow OutdoorsMay 13th
Harvest BeginsJul 22nd
Harvest EndsSep 27th

Crop Details

Transplant Conditions: Wait until soil reaches 50°F and nights stay above 45°F before moving outdoors.
TraitValue
Days to Maturity70
Sun RequirementsFull Sun
Growth HabitUpright
Support NeededNone
Planting DepthSurface
Germination Temp (°F)65
Min Soil Temp (°F)50
Min Night Temp (°F)45
Harden Off (days)Not Required
Expert Note: For the best blooms, sow in full sun and keep seedlings evenly moist—cornflower can struggle if its roots are disturbed.