Dynamics of stump sprout regeneration after transformation to multiaged management in coast redwood forests

•Residual stand influenced stump sprout regeneration dynamics in multiaged redwood.•Partial cutting initiated new cohort dominated by redwood and tanoak sprouts.•Re-sprouting redwood outperformed re-sprouting tanoak to six years of age.•Redwood sprouts became dependent on understory light in third growing season.•Redwood sprout growth benefitted slightly from aggregated vs. dispersed retention.