Physocarpus opulifolius 'Little Devil' problems — and how to fix them

This cultivar is bred for better mildew resistance, but humid, crowded conditions can still bring white film on leaves. Maintain airflow and water at the base, not overhead.

Too little sun mutes the burgundy to dull green. Plant in full sun to keep the colour rich.

Its small size makes it popular in pots, which dry quickly. Use a good potting mix, check moisture often in summer, and avoid letting the rootball bake.

Interveinal yellowing on chalky ground. Add organic matter or grow in a container with ericaceous-leaning compost on very limy sites.