How to fertilize a gardenia

How to fertilize a gardenia

1. 01

   When to fertilize

   Feed during active growth rather than treating winter as a normal feeding season. Outdoors in warm climates, established gardenias get two or three feeds a year, with dates set by region. Do not use those dates indoors.

   Keep feeding aligned with active growth and flowering. Reduce or stop routine feeding when the plant is resting in low light or cold conditions, and do not apply the Florida outdoor schedule as an indoor winter routine.

2. 02

   Fertilizer type and dose

   Choose a fertilizer labeled for acid-loving plants or an acid-forming garden fertilizer. Keep the root medium acidic instead of trying to correct yellow leaves with an arbitrary high dose. The format can be liquid, granular, or slow-release according to the label and setting.

   Follow the product label. Outdoors, a fertilizer with 30 to 50 percent slow-release nitrogen works well. Indoors, use half-strength acid fertilizer every few weeks in summer.

3. 03

   When not to fertilize

   A crust or salt build-up on the potting mix, declining roots, or yellow leaves should trigger a check of water quality, moisture, and pH before adding more feed. Yellowing alone does not prove a nutrient shortage.