Arborvitae Fertilizer Confusion: Fish Emulsion Sources and Japanese Maple Verticillium Wilt

"Fishline" fertilizer doesn't exist—the expert likely meant fish emulsion, a liquid organic fertilizer. It's effective but odorous. Better alternatives: composted poultry manure, biosolids (Milorganite), or balanced organic granulars. Sources: North Country Organics (online), or Long Island nurseries—Father Nature's (East Islip), Dodds & Eder (Oyster Bay), Whitmore's (Hamptons).

Japanese maple not fully leafing out with dead spots suggests Verticillium wilt—a soil-borne vascular fungus. Diagnose by cutting a dead branch: look for dark streaks or rings in the cross-section. No cure exists, but heavy fertilization (high nitrogen) and consistent watering can help the tree outgrow the infection by producing new vascular tissue faster than the fungus spreads.

Prune out dead wood. Mulch with compost. Avoid root disturbance. Some maples live decades with Verticillium if kept vigorous.