Nasturtiums in Hot Mediterranean Climates: Sun, Shade, and Soil

Nasturtiums are often labeled "full sun," but in hot Mediterranean summers, intense afternoon sun scorches their large, thin leaves. They tolerate heat only with consistent moisture and prefer bright light without extreme temperatures.

Adjusting for Summer Heat

• Move pots to shade during peak heat (morning sun / afternoon shade is ideal).
• As temperatures cool, transition back to more sun.
• Repot only if root-bound; use well-draining potting mix (not garden soil).
• Provide a trellis or fence—climbing improves air circulation and light exposure.
• Prune spindly growth to encourage bushier regrowth.

Critical Soil Advice

Nasturtiums prefer lean, well-drained soil. Rich, nitrogen-heavy mixes produce lush foliage but few flowers. Next season, try a simple, low-nutrient potting mix. Water deeply, let dry, repeat. Avoid crowding and extremes of wet/dry or hot/cold.

Don't Give Up

Moving plants to find their sweet spot is exactly the right approach. The problem is often soil, not just location.