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Trees will often grow secondary roots right inside the mulch pile in search of more air and better drainage.—Brandee Gruener, Southern Living, 24 May 2026 Gently remove the tree from its container: Take care not to break the taproot or disturb the delicate secondary roots.—Rae Ford, Martha Stewart, 17 May 2026 The secondary roots that grow out of the main roots are called tubers.—Carol Eustice, Verywell Health, 18 Aug. 2025