Clematis Declining After Five Years: Shade, Fertilizer, or Pruning Timing?

A gardener's 5-year-old clematis bloomed heavily for three years, but last two years vines are thinner, blooms reduced, plant looks fragile. He fertilizes with 10-10-10 in early spring and soluble feed post-bloom, prunes to 12 inches in fall. Plant is early-blooming type; new growth now comes from base, not old canes.

Diagnosis

Tom suggested checking for increased shade from maturing trees/shrubs. Avoid high-nitrogen fertilizer. Use well-composted cow manure and mulch with straw to keep roots cool. For early-flowering clematis (Group A), prune immediately after bloom (no later than end of July) to allow new growth to set next year's buds. Pruning in fall removes those buds.

Correct pruning timing and avoiding excess nitrogen are critical for clematis vigor.