Tibouchina Grandiflora in Pots: Winter Watering Adjustments

The Problem

In Houston, tibouchina in pots by the pool turned brown after a few nights in the 40s°F. Owner waters with rainwater/sprinkler, asks if overwatering or cold is the cause.

Seasonal Watering Shift

As nights cool, reduce watering drastically. Water in the morning only, so soil enters night on the dry side. Wet soil + cold nights = root rot and fungal issues.

Cold Protection

• Move pots indoors overnight if frost/freeze is forecast.
• Return outdoors during warm days.
• Keep foliage dry at night.

Recovery

Leaf drop is a stress response. With proper winter care, new growth returns in spring. Tibouchina is root-hardy in Zone 9 but top-growth dies back in freezes.