|We have a koi fish pond with a 150 sq.ft. irregular surface area and plan to plant the perimeter with willow trees. Is there a concern with root invasion and will leaf dropping require too much maintenance?
|Willow trees might be more trouble than they're worth if planted near a pond. Willows are fast growing, have invasive root systems, and are subject to tent caterpillars, aphids and spider mites. While your fish might enjoy any insects falling from the leaves, the close proximity of the trees to open water will make pest control almost impossible.
You might want to consider planting maple, birch, redbud or an evergreen conifer such as Leyland cypress instead of willow.