Coreopsis Indoors? Not Recommended for Zone 5

Coreopsis (tickseed) is a full-sun, heat-loving perennial that fails as a houseplant in Zone 5 winters.

Why It Declined

• Insufficient light: Needs 6–8 hours direct sun. Windows provide <20% of outdoor intensity.
• Wrong temperature: Prefers 70–85°F days/60°F nights. Indoor heat + low light = weak, etiolated growth.
• Overwatering: "Frequent watering" in low light rots roots.

What to Do Now

• Move pots outdoors as soon as soil thaws (April). Place in full sun.
• Cut dead growth to crown. Water deeply once.
• Let nature take over. Coreopsis is perennial in Zone 5—it will resprout from roots.

Indoor Alternative

If you want winter blooms indoors, grow African violets, kalanchoe, or cyclamen—they're adapted to low-light, stable temperatures.

Coreopsis belongs outside. Trust its hardiness.