Maple Seedling Care: Transplanting Timing and Leaf Spot Treatment

Six 3-year-old maple seedlings (Norway, red, unknown) in 6-inch pots at 2,000 ft in Santa Cruz, CA. Stems are ¼ inch, 9 feet tall. One has rust spots, another brown leaf tips. When to transplant? How to repot for gifting? What's causing leaf blemishes?

Transplanting Guidelines

Wait until winter dormancy (after leaf drop). Dig holes twice the pot size, plant with existing soil, backfill with quality topsoil, mulch ≤3 inches, and water well. Maples transplant easily when dormant.

Leaf Spot Fungus Management

Spots are fungal. Multiple fungi cause similar symptoms, all controlled by the same fungicides. Timing is critical: apply protectant fungicide before spore dispersal in early spring as leaves unfold.

Spray Schedule

• First application: bud break
• Second: 7–14 days later
• Third: if rainy periods persist

Effective Fungicides

Chlorothalonil (Daconil 2787, Bravo), fixed coppers, mancozeb, maneb, zineb. Check local nursery availability.

Cultural Control

Rake and destroy all fallen leaves to reduce overwintering spores.