How to Get Your Indoor Hibiscus to Bloom

A 13-year-old hibiscus that rarely blooms is a common frustration. The key to abundant flowers is simple: this tropical shrub needs full sun. If yours has been living indoors by an east-facing slider in Spokane, it's likely starving for light.

Move It Outside Immediately

Hibiscus plants are native to the Caribbean and require full, direct sun all day to set buds. Place it outdoors as soon as nighttime temperatures stay above 45°F (7°C). It will not sunburn—it craves that intensity.

Boost Blooms with Simple Amendments

• Apply a balanced water-soluble fertilizer (like Miracle-Gro) according to label directions.
• Sprinkle ½ cup of Epsom salts (magnesium sulfate) on the soil surface before watering. Magnesium encourages flower production.

Seasonal Routine for Year-Round Beauty

In fall, bring the plant inside before temperatures drop below 45°F. Place it in a bright south-facing window. Once flowering finishes, prune branches back by at least half. This encourages bushier growth and more flowering stems for the next summer.

Sunlight is the non-negotiable trigger for hibiscus blooms. With a summer outdoors and a winter rest period, your mature plant can become the flowering showpiece it's meant to be.