Organic Rose Care for Large Collections: A Seasonal Guide

Organic Rose Care for Large Collections: A Seasonal Guide

Managing 55 roses organically in Perth (Autumn) requires a systematic approach.

Dormant Season (Now)

• Apply lime sulfur spray (for trees/shrubs) now and again before leaf-out.
• Prune hard to 18 inches; remove canes thinner than a pencil.
• Remove one old gray cane per year to encourage new basals.

Growing Season

• Aphids: Blast off with water hose daily; birds eat fallen pests.
• Mildew: 1 tbsp baking soda per quart water, spray daily until clear.
• Black Spot: Foliar feed with liquid fish fertilizer monthly—changes leaf pH to deter spores.

Feeding

Worm castings, mulch, and monthly fish fertilizer provide complete nutrition without chemicals.