Double Knock Outs Yellowing After Mushroom Manure: Winter Damage?

Eight Knock Outs Yellowing Despite Good Care

Eight bushes planted last year. One dead in spring. Others green with buds, now all yellowing, dropping leaves. Soil good, mushroom manure added fall, no fertilizer this year, plenty moisture.

Suspect: Weird Winter Weather

Many gardeners report roses leafing out using stored cane moisture, then failing as roots (damaged by winter) can't support growth.

Check

Scratch canes—brown under bark = winter kill. If canes dead, top growth doomed. Wait for basal breaks.

No Quick Fix

If roots damaged, recovery uncertain. Mushroom manure unlikely cause (beneficial if aged).