Overwintering Hibiscus & Alstroemeria in a Heated Garage (60°F)

At 60°F, neither plant goes fully dormant. Hibiscus becomes semi-dormant (loses some leaves); Alstroemeria keeps growing. Both need light and water.

Setup

• Light: 40-watt shop light (or LED equivalent) 12–14 hours daily, 12 inches above plants.
• Water: Weekly — keep soil evenly moist, not soggy. Pots must drain.
• Fertilizer: None until after last frost.
• Temperature: 60°F is perfect — cool enough to slow growth, warm enough to prevent dieback.

Spring Transition

When nights >50°F, move to shade 10 days, then full sun. Resume feeding. Hibiscus may need a light shaping; Alstroemeria can be divided if crowded.

This "cool greenhouse" approach keeps both plants alive and ready to explode in spring.