Why Gardenias Fail as Houseplants: Soil and Light Issues

Gardenias Need Full Sun and Sandy Soil

Indoors, they require:

• Direct sun all day: Large south window, no curtains.
• Sandy, fast-draining soil: They come in peat moss (holds too much water → root rot). Immediately mix in sand.
• Water when somewhat dry: Empty drain tray after 1 hour.
• Heat: They love warmth; cool nights help bud set.

Resource

Gardenia care guide: plants.greentreewebdesign.com/gardenia.html

Even with perfect care, reblooming indoors is tough. Enjoy the flowers, then consider it a temporary guest.