This is the 16783rd most frequent Korean word.
산딸기
Wild raspberry.
Here, '산딸기' refers to the fruit itself (wild strawberries) used as the main subject of the sentence.
산딸기는 제철일 때 가장 맛있어요.
Wild strawberries taste best when they are in season.
In this case, '산딸기' describes the type of plant (wild strawberry tree) being planted.
그녀는 정원에 산딸기 나무를 심고 싶어합니다.
She wants to plant wild strawberry trees in the garden.
Here, '산딸기' is used to refer to wild strawberries as the main ingredient for jam.