Dataset of 213 artificially tilted seedlings of 21 tropical tree species including raw measurement and the three computed parameters: stem gravitropic efficiency, maturation strain of tension wood and standardized debarking curvature. See our article for detailed explanation. Family (-) Botanical family of the seedling; Species (-) Species of the seedling; Tree_code (-) Individual number of the seedling; Species_code (-) Individual code including species and individual number; Mean_diameter_with_bark_(before_harvest) (mm) Mean stem diameter before harvest; Opposite_bark_thickness (mm) Bark thickness on the opposite side; Tension_bark_thickness (mm) Bark thickness on the tension side; Bark_eccentricity (-) Bark eccentricity, see article for more details; Wood_diameter_(parallel_to_tilting_axis) (mm) Wood diameter in the tilting axis; Wood_diameter_(perpendicular_to_tilting_axis) (mm) Wood diameter perpendicular to the tilting axis; Wood_eccentricity (-) Wood eccentricity, see article for more details; Pith_radius (mm) Radius of the pith; Initial_wood_radius (mm) Radius of wood before tilting; Final_wood_radius (mm) Radius of wood after tilting; Initial_bark_thickness (mm) Estimation of initial bark thickness based on the initial mean stem diameter (data not shown) and the radius of wood before tilting; TW_extension_(Beta) (degree) Angular extension of the tension wood sector; Maturation_strain_of_tension_wood_(in_strains) (strains) Maturation strain of tension wood computed using the model of Alméras et al. (2018); TW_ring_thickness (mm) Thickness of the tension wood ring; OW_ring_thickness (mm) Thickness of the opposite wood ring; Stem_gravitropic_efficiency (microstrains) Stem gravitropic efficiency, see article for more details; Pith_proportion (%) Proportion of the pith radius on the final wood radius; dC_stem (rad/mm) Change in curvature of the stem after release of the stem from the stake; dC_bark (rad/mm) Change in curvature of the stem after debarking; Standardized_debarking_curvature (degree/dm) Standardized debarking curvature, see article for more details; dC_wood (rad/mm) Change in curvature of the wood segment; Maturation_strain_of_tension_wood (microstrains) Maturation strain of tension wood computed using the model of Alméras et al. (2018); Anatomical_group (-) Anatomical group of tension wood per species: unlignified G-layers, lignified G-layers or no G-layer; Intra-specific_anatomical_group (-) Anatomical group of tension wood per individual for 4 species with varying level of lignification: unlignified G-layers or lignified G-layers; Day_of_tilt (date) Tilting day; Day_of_harvest (date) Day of harvest; Time_of_tilting (days) Number of days of tilting; Stem_diameter_(parallel_to_tilting) (mm) Stem diameter in the tilting axis at harvest day; Stem_diameter_(perpendicular_to_tilting_axis) (mm) Stem diameter perpendicular to the tilting axis at harvest day; Wood_diameter_(parallel_to_tilting) (mm) Wood diameter in the tilting axis at harvest day; Wood_diameter_(perpendicular_to_tilting) (mm) Wood diameter perpendicular to the tilting axis at harvest day; Mean_stem_diameter (mm) Mean stem diameter at harvest day; Mean_bark_thickness (mm) Mean bark thickness at harvest day.