Reviving a 'New Dawn' Climber After Mysterious Summer Collapse

France (Zone 8-9 equivalent). 3-year-old 'New Dawn' climber withered completely by mid-July—leaves brown, canes bare. Gardener away 6 weeks on auto-watering. Returned to find green tips on most canes and two flowers. Asks if recovered, whether to dig roots, how to prune.

Assessment: Likely Root Stress, Not Death

Complete defoliation + regrowth suggests severe stress (heat, drought, root fungus) but surviving root system. Honey fungus (Armillaria) possible—check roots.

Root Check Protocol

1. Dig beside plant with trowel
2. Healthy roots: firm, white/light tan, no odor
3. Honey fungus: black rhizomorphs (shoestrings) under bark, mushroom smell
4. If fungus: remove and burn entire plant—don't compost

If Roots Healthy: Hard Renovation Prune

• Cut to 3 ft height
• Keep 4-5 thickest, healthiest canes
• Remove all thin, dead, crossing wood
• This balances top growth to reduced root capacity

'New Dawn' Specific Needs

Heavy feeder—requires extra fertilizer after first flush + supplemental water for second flush. Not a "plant and forget" rose.

Cane Selection

Keep new, greenish canes (more flowers, confirmed health). Older woody canes often decline in productivity. 3-5 strong canes ideal.

Monitor. If honey fungus confirmed, replace with resistant rootstock variety.