<![CDATA[This study examined how nature-based learning media affects the cognitive development of 4–5-year-olds at PAUD Kebun Cengkeh, Ternate. It used a one-group pretest-posttest pre-experimental design with 7 children in this age group. The learning media came straight from the school's surroundings — leaves, stones, twigs, flowers, seeds, soil, sand, and plants — used during play and exploration sessions. Data were collected using observation sheets built around five cognitive indicators: classifying objects, understanding number concepts, sequencing objects, recognizing patterns, and solving simple problems, each rated on a 1–4 scale. Average pretest scores rose from 12.00 (60.00%) to 18.86 (94.29%) at posttest. A paired-sample t-test returned p < 0.001, and the average N-Gain of 0.87 placed the improvement in the high category. This gain suggests that play and exploration built around natural materials tracked closely with better cognitive performance in the children studied. In practical terms, the objects already scattered around a school yard can serve as a concrete learning resource without any need to buy specialized materials.]]>
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