The successful establishment of a Garcinia humilis orchard depends on planting high-quality seedlings. This study aimed to evaluate the effects of the shading level (0 %, 18 % and 50 %) and substrate composition on the formation of G. humilis seedlings. Four substrates (S) were evaluated combining different proportions (v:v) of soil (SO), cattle manure (CM), commercial substrate (CS), sand (SA) and fine grain vermiculite (FV): S1 = 0 % SO + 45 % CM + 20 % CS + 20 % SA + 15 % FV; S2 = 15 % SO + 30 % CM + 20 % CS + 20 % SA + 15 % FV; S3 = 30 % SO + 15 % CM + 20 % CS + 20 % SA + 15 % FV; S4 = 45 % SO + 0 % CM + 20 % CS + 20 % SA + 15 % FV. The experiment was conducted in a completely randomized design in each environment, being the environments compared by a joint analysis. The G. humilis seedlings with the highest quality were obtained in the environment with a 50 % shading screen. G. humilis seedlings do not grow when exposed to full sunlight and, therefore, the seedling production of this species with direct solar radiation, without some shading level, should not be recommended. Different combinations from the mixture of soil, cattle manure, commercial substrate, sand and fine grain vermiculite may be used in the formulation of substrates for G. humilis seedlings.

The plant environment in the production of Achachairu (Garcinia humilis) seedlings aims to obtain quality plants for orchards' formation. The present study aimed to evaluate reflective materials on benches and fruit seeds harvested from different plant positions to produce Achachairu seedlings. The reflective materials used under the cultivation benches were aluminum foil, "fake sequin" fabric, mirror, and tetra pak®. The fruit collection positions in the plants were at the top, median and bottom. The largest seedlings were obtained on the bench with reflective material of Tetra Pak®; however, in this material, there was a greater relationship between the height and diameter of the seedlings' neck, which is not desired for quality seedlings. The largest number of sheets was observed on the benches with reflective material of Tetra Pak® and "false sequin" fabric. The lowest dry masses of the root system and the lowest Dickson quality indexes were obtained from seedlings grown on the bench with reflective mirror material, forming lesser quality seedlings. The fruit collection place in the matrix plant did not influence the seedlings' quality. The use of reflective material on the bench is not recommended for the cultivation of Achachairu seedlings.